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WO1994001757A1 - Systeme de mesure et de diagnostic de la corrosion - Google Patents

Systeme de mesure et de diagnostic de la corrosion Download PDF

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Publication number
WO1994001757A1
WO1994001757A1 PCT/US1993/006201 US9306201W WO9401757A1 WO 1994001757 A1 WO1994001757 A1 WO 1994001757A1 US 9306201 W US9306201 W US 9306201W WO 9401757 A1 WO9401757 A1 WO 9401757A1
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WIPO (PCT)
Prior art keywords
fitness
corrosion
determining
intended use
test specimen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1993/006201
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English (en)
Inventor
Michael W. Osborne
David W. Hughes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Purafil Inc
Original Assignee
Purafil Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Purafil Inc filed Critical Purafil Inc
Priority to AU46571/93A priority Critical patent/AU4657193A/en
Publication of WO1994001757A1 publication Critical patent/WO1994001757A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light

Definitions

  • the present invention relates in general to a system for monitoring deterioration of an environment. More particularly, the invention relates to comparing and monitoring corrosion and deterioration in different locations about its environment so as to obtain a spatial fitness profile of the system.
  • Certain components and devices such as metal- containing components in electronic systems, and filters within gas purification systems are highly sensitive and subject to atmospheric corrosivity. Prolonged exposure to such atmospheric corrosivity has harmful effects on the electrical components and the gas filtration media and can cause deterioration and failure of the systems over time.
  • Corrosion can take several forms.
  • One form of corrosion occurs in the formation of metal oxides resulting from a reaction between the metallic components and devices of the system with oxygen in the air.
  • Another form of corrosion occurs, for example, when an electronic system is subject to corrosive gases which are harmful to the circuitry within the system.
  • gases include sulfur dioxide, hydrogen sulfide, hydrogen chloride, and the like. Even at parts-per-million concentrations, the presence of these gases can lead to failure of the electronic equipment due to corrosion of circuitry or deterioration of the filtration medium due to corrosive gases, in as little time as several months, depending on the concentration of the corrosive agents.
  • One such preventative measure is the use of a gas or chemical purification system placed in the room or housing, whereby the filtration medium of the system filters or purifies the environment of atmospheric impurities so that corrosive gases and particles are less likely to reach the circuitry within the electronic systems.
  • a problem in relying upon the filtration medium of a purification system to purify the environment is that presently no means of monitoring the filtration medium is available in real-time. Thus, the deterioration of the filtration medium often goes unnoticed, thereby allowing corrosive agents to be present in the atmosphere and to corrode the electrical components within electronic systems.
  • the standard industry method for measuring corrosivity of the environment in a room is commonly referred to as the "coupon" method, whereby a clean copper strip is exposed to the atmosphere for a period of time.
  • the amount of corrosion on the strip can be determined by electrochemically converting the oxidized copper back to metallic copper.
  • the amount of copper that corroded in the time period of exposure can be calculated.
  • an accepted standard set by the Instrument Society of America (ISA) can be applied to describe the weekly, monthly, or annual build-up of corrosion on similar substrates contained in the same environment.
  • a major disadvantage of the coupon method is that it is labor intensive and requires costly analysis and measurement of the corroded strip which can be performed only after the exposure period, which, for example, can be between one and three months.
  • Another disadvantage in the present method is that once the strip of copper is corroded and measured for collective corrosion, the used metal strip must be discarded and a new metal strip must be exposed in the environment so that further actual corrosion measurements can be taken.
  • each strip yields information only on the average amount of corrosion suffered by the test strip. It is, therefore, difficult to determine the rate at which corrosion occurs if the corrosion rate varies at variable time intervals.
  • a further disadvantage of the present method is that by using the copper strip, only the corrosivity of the atmosphere can be measured. Such corrosivity levels measured by the copper strip may not fully describe other hazards in the environment, such as relative humidity, temperature, physical shock and the like.
  • An electronic corrosion sensor identified by the trademark ONGUARDTM has been marketed by Purafil, Inc. and incorporates piezoelectric technology, whereby a piezoelectric crystal is used to monitor levels of corrosion in a room. Additionally, the ONGUARD unit reports levels of corrosion in terms recognized by industry standards, and includes sensors which are sensitive to temperature and relative humidity. The ONGUARD unit monitors corrosion on a real-time, continuous basis and calculates cumulative and incremental corrosion rates, as well as projects corrosion levels up to thirty days in advance so as to predict when failures might occur. All of the above-mentioned patents and products involve methods and apparatus for sensing corrosion in a room, such as in a computer control room.
  • the present invention comprises a corrosion profiling apparatus and method for monitoring and comparing corrosion levels and other environmental conditions about different locations.
  • the corrosion profiling system is positioned in a path of gas flow of a system subject to deterioration induced by its environment.
  • the present invention comprises at least a first and a second metallic test specimen spaced from each other in different locations about the system, detector means for measuring the amount of corrosion on at least two of the metallic test specimen, means for comparing the amount of measured corrosion of one of the measured test specimen relative to another of the measured test specimen, and a data logging means for recording the compared measured corrosion.
  • the corrosion experienced by each of the measured test specimen is indicative of the spatial fitness profile of the system.
  • the metallic test specimen of the metallic corrosion detector can take the form of one or a combination of several embodiments.
  • One embodiment of the *. test specimen is a crystal, such as a piezoelectric crystal which has a constant natural oscillation frequency dependent upon the mass of the coating on its surface.
  • a coating on the surface of the piezoelectric crystal can comprise a corrodible metallic substance, such as copper, gold, nickel, silver, zinc, and the like.
  • the mass on the piezoelectric crystal surface will become altered, thus, altering the oscillation frequency of the crystal.
  • the mass on the crystal will either increase or decrease.
  • the corrosion profiling apparatus of the present invention comprises at least two test specimen, such as two piezoelectric crystals coated with metallic substances. Measurements of the amount of corrosion experienced by the piezoelectric crystals can be real-time, on-line and continuous measurements which are registered and can be converted to a value. Accordingly, the values for each of the test specimen can reflect a calibration and a correction step which accounts for any deviation in atmospheric conditions or in the apparatus during each interval of time.
  • the corrected values of each of the test specimen can then be compared to each other so as to determine the differences in corrosion levels on each of the test specimen.
  • a signal, generated by the comparison step can then indicate the spatial fitness profile of the system being tested.
  • the corrected value can first be memorized in a data-logger, and then a comparison step can be used to compare the data extracted from the data-logger.
  • the signal formed by each of the above-mentioned methods can have the option of being stored or being displayed to the user.
  • the present invention can embody a small, stealthy unit, whereby the apparatus might be concealed from the sight of the user.
  • Such an apparatus can be located within a system, such as directly on a printed wiring board of a computer, or concealed within a gas purification system, both upstream and downstream of the filtration medium.
  • the unit can be normally dormant, whereby the apparatus is capable of turning itself on at certain intervals so as to measure the amount of corrosion experienced by the test specimen.
  • the present invention also can include a variety of sensors, including sensors for measuring temperature and relative humidity. Additionally, other sensors can measure magnetic field strength, electric field strength, and particulates in the atmosphere. Signals from these sensors can be displayed or can be directed to other devices such as a digital memory and can be used to trigger alarms to the user.
  • the output display also can show levels of corrosion in incremental corrosion rate in values which can be related to ISA standards or other industry-accepted standards.
  • the output from the present invention is capable of diagnosing the corrosive areas of a system subject to deterioration and is able to obtain a spatial fitness profile of the system for use in predicting and projecting the ultimate reliability of the device, component or system.
  • the step of measuring the amount of corrosion on at least one of the upstream and one of the downstream test specimen comprises measuring the light reflected from a metallic material or measuring an electrical resistance across a metallic material.
  • the corrosion profiling system of the present invention has many practical applications which address the need for monitoring and comparing corrosion deterioration and other factors about different locations.
  • One exemplary application is the installation of the present invention at the input and the output of a gas filtration medium of a gas purification system.
  • the corrosion from the input sensor should measure higher than the corrosion levels sensed by the output sensor, because the gas flow is being scrubbed or cleaned by the filtration medium of the purification system.
  • the filtration medium becomes exhausted, the filtration medium is less efficient in reducing the amount of corrosive agents in the gas stream.
  • the corrosion level at the input equals the corrosion level at the output indicating that the filtration media is used up.
  • the present invention therefore, enables a user to determine when the filtration medium needs replacement so that ⁇ the medium can be immediately replaced to avoid damage to systems caused by the presence of corrosive agents in the environment.
  • Another application of the present invention is the use of multiple sensors within a circuit board of a computer system for monitoring and comparing deterioration about the spatially positioned sensors. This type of information can be used to determine the locations within the electronic system that are most susceptible to corrosion deterioration.
  • an object of the present invention to provide a corrosion profiling system for monitoring and comparing deterioration and other environmental factors about different locations so that a spatial profile of the system can be obtained.
  • Another object of the present invention is to provide a corrosion profiling system which is small, stealthy, and tamper resistant.
  • a further object of the present invention is to provide a corrosion profiling system which monitors and compares deterioration and corrosion, with the monitor including a variety of sensors, such as sensors for temperature, corrosion, relative humidity, magnetic field strength, electric field strength, and particulates. It is another object of the present invention to provide a corrosion profiling system for use in a gas or an air purification system so as to monitor the effectiveness of the gas or air filtration medium.
  • Another object of the present invention is to provide a corrosion profiling system having the option of detecting specie-specific or gas-specific types of corrosion in the environment.
  • a further object of the present invention is to provide a corrosion profiling system which can be used within an electronic system for profiling corrosion via multiple detectors which have been spatially arranged.
  • Fig. 1 is a side elevational view of one embodiment of the metallic test specimen of the present invention.
  • Fig. 2 is a side view of another embodiment of the metallic test specimen of the present invention.
  • Fig. 3 is a side view of yet another embodiment of the test specimen of the present invention.
  • Fig. 4 is a schematic diagram illustrating the process used to indicate the spatial fitness profile of a system using any of the above-mentioned metallic corrosion test specimen.
  • Fig. 5 is a schematic diagram illustrating another process of indicating the spatial fitness profile of a system using any of the above-mentioned metallic test specimen.
  • Fig. 6 is a schematic diagram illustrating another embodiment of the corrosion profiling system including a magnetic field strength sensor, an electric field strength sensor, and a particulate sensor.
  • Fig. 7 is a schematic diagram illustrating an interval timer implemented in any of the corrosion detector embodiments of the present invention.
  • Fig. 8 is a bar graph illustrating the interval timing concept of Fig. 6.
  • Fig. 9 is a side view illustrating one application of the present invention.
  • Fig. 10 is a line graph illustrating an example output of incremental corrosion rate from the input sensor and the output sensor of Fig. 9.
  • Fig. 11 is another line graph showing another example of the incremental corrosion rate from the input sensor and from the output sensor of Fig. 9.
  • Fig. 12 is a perspective view illustrating another application of the present invention within an electronic system.
  • Figs. 1, 2 and 3 illustrate several embodiments of metallic test specimen used to detect levels of corrosion in metallic corrosion detectors, such as the corrosion detectors 28, 29, 38, 39, and 48 as shown in Figs. 4 through 6, respectively.
  • one embodiment 10 of the metallic test specimen of the metallic corrosion detector comprises a quartz crystal, such as a piezoelectric crystal 11 having one side 12 and another side 14. Bonded to or deposited on each of the sides 12 and 14 of the piezoelectric crystal is a layer of chromium 15 which is approximately 30 A thick. A layer of corrodable metallic substance 16 is then bonded or deposited onto the layer of chromium 15.
  • the layer of chromium 15 serves to bond the corrodable metallic substance 16 to the piezoelectric crystal 11.
  • Longitudinal leads 17 are placed over both sides of the metallic substance 16 so as to connect the metal-coated crystal with other elements of the metallic corrosion detector, such as a power source, an oscillator, an amplifier and a counter (not shown) in Fig. 1 which are all well known in the art of quartz crystal monitoring techniques.
  • the piezoelectric crystal 11 can be implemented for use as any or all of the test specimen of the spaced metallic corrosion detectors required to obtain an accurate spatial corrosion profile.
  • Fig. 2 shows another embodiment 18 of the metallic test specimen used to detect corrosion levels of the corrosion detectors 28, 29, 38, 39 and 48 as shown in Figs.
  • a clean metallic strip 19 is usually assumed to carry an initial copper oxide corrosion thickness of approximately 100 A.
  • the change in thickness of corrosion build-up on the strip 19 occurs, and the thickness of corrosion is measured.
  • Such measurements require the use of a complex coulometric reduction procedure, well known to those skilled in the art.
  • elements within the circuit of the metallic corrosion detector also can measure the intensity of incident light 20 projected onto the metallic strip 19 with respect to the intensity of the light reflected 21 from the metallic strip. Changes in the intensity and other properties of the reflected light with respect to the incident light are related to the amount of corrosion suffered by the metallic strip 19.
  • a metallic strip 23 of material Fig. 3
  • Fig. 3 a metallic strip 23 of material
  • Fig. 3 a metallic strip 23 of material
  • corrosion of the strip occurs which alters the electrical resistance of the strip and the changes in resistance across the metallic strip 23 can be measured by ohm meter 24.
  • Such changes in electrical resistance occur as corrosion levels increase in time and are, in part, due to a reduction of the effective cross- sectional area of the metallic strip 23.
  • test specimen embodiments 10, 18 and 22 can be coated with or comprised of metallic substances, such as gold, copper, iron, steel, zinc, nickel or silver.
  • the test specimen used in each of the corrosion detectors in the present invention also can be tailored so as to detect a specie-specific corrosive gas within the environment. For instance, the metal, zinc can only be corroded by the gas chlorine. Therefore, if zinc is used as the metallic test specimen in the detector and the zinc corrodes, then chlorine must have been present in the atmosphere. This type of knowledge helps the user to determine within the corrosion profiling system where the most corrosive gases occur and specifically, the type of gases present in the environment. Under these circumstances, the user might be able to diagnose the problem and to find the source of the corrosive gases.
  • Fig. 4 shows a schematic diagram of a corrosion profiling system 25, including a metallic corrosion detector 28 and another metallic corrosion detector 29, which are normally spaced and positioned in different locations, preferably at least one in a gas stream upstream and at least one in a gas stream downstream of the system being monitored and profiled.
  • the metallic corrosion detectors 28 and 29 can comprise any of the metallic test specimen 10, 18, or 22 illustrated in Figs. 1 through 3, and other elements (not shown) such as a power source, an oscillator, and an amplifier, which are all well known in the art.
  • the system 25 can comprise a plurality of corrosion detectors, such as detectors 28 and 29, spatially arranged so as to determine the levels of corrosion in different locations and comparing the measured corrosion levels of the different locations. It would be desirable to obtain corrosion information from many different locations to determine an accurate fitness profile of the system or environment being monitored.
  • Each of the metallic corrosion detectors 28 and 29, sense corrosion levels in the environment and generate raw or uncorrected signals.
  • the uncorrected signals from each of the detectors are then transmitted to calibration and correction algorithms, such as calibration and correction algorithm circuits which convert the raw, uncorrected signals to corrected signals which indicate true-corrosion.
  • the calibration and correction algorithms 30 and 31 can also include conventional atmospheric sensors (not shown) , such as a relative humidity sensor and a temperature sensor.
  • a relative humidity sensor can be of a conventional design, such as a National LM 35, which can be used as a temperature sensor, and a humidity sensor can comprise a MINICAP 2, manufactured by Panametrics.
  • the calibration and correction algorithms 30 and 31 preferably can be incorporated into a programmable microprocessor using techniques which are well known to those skilled in the art.
  • the values from each of the detector are transmitted to a comparison step 32 (Fig. 4) , whereby the values of true-corrosion from each of the metallic corrosion detectors 28 and 29 are compared to each other so as to determine the differences in corrosion levels experienced by each of the metallic corrosion detectors.
  • the differences in other environmental conditions, such as the temperature and relative humidity at each detector can be compared to reflect the relevances of temperature and relative humidity.
  • the compared values of true-corrosion levels can then be stored in a data logger 34, which can embody a memory chip.
  • the data logger can then store all the readings and comparisons performed by the comparison step 32 so as to notice any deviation in the corrosion levels experienced by the corrosion detectors, the temperature, or the relative humidity.
  • An optional output is available to the user via any number of output means, which indicates the variances and differences in the levels of corrosion experienced by the spatially positioned detectors.
  • Fig. 5 illustrates a schematic diagram of another embodiment 35 of the corrosion profiling and diagnostic system, including a metallic corrosion detector 38 and a metallic corrosion detector 39. Similar to the embodiment of Fig. 4, one of the components of the metallic corrosion detectors 38 and 39 comprise metallic test specimen for measuring levels of corrosion, which can embody any of the metallic test specimen 10, 18 and 22 as shown in Figs. 1 through 3. Other elements of the metallic corrosion detectors 38 and 39, which are not shown in Fig. 5, include conventional elements, such as a power source, an oscillator, an amplifier, and a counter, which are all well known in the art.
  • the metallic corrosion detectors 38 and 39 can develop uncorrected signals indicating levels of corrosion experienced by their respective corrosion detectors which enter circuits having a calibration and correction algorithm, such as the calibration and correction algorithms 40 and 41.
  • a calibration and correction algorithm such as the calibration and correction algorithms 40 and 41.
  • Such algorithms convert the uncorrected signals to a corrected signal indicating true-corrosion.
  • the calibration and correction algorithms 40 and 41 can take into effect other environmental conditions, such as temperature and relative humidity by sensors (not shown) , which sense the different atmospheric conditions.
  • a data logger 42 as shown in Fig. 5, then stores the corrected signals generated by each of the calibration and correction algorithms 40 and 41.
  • a comparison step 44 can be incorporated to compare the values stored in the data logger, by means of a comparator which is generally well known in the art.
  • the comparison step 44 compares variances and differences in the amount of corrosion level experienced by each of the metallic corrosion detectors 38 and 39. Similar to Fig. 4, an optional output means is available to indicate the measured and compared corrosion values to a user.
  • the corrosion profiling and diagnostic system can combine the outputs of several types of sensors, as shown in the embodiment 45 (as illustrated in Fig. 6) , which is normally used within a housing 46 or a portable housing.
  • This embodiment 45 includes a metallic corrosion detector 48, which can embody all or any of the metallic corrosion test specimen of Figs. 1 through 3 and other components (not shown) which are well known in the art.
  • an uncorrected signal is generated by the metallic corrosion detector 48 and is transmitted to a circuit having a calibration and correction algorithm 49.
  • the calibration and correction algorithm can generate a signal indicating true-corrosion, and can reflect outputs from a relative humidity sensor 50 and a temperature sensor 51, which account for the effects of relative humidity and temperature on the corrosion level.
  • the signal can enter a data logger 52, whereby a multiplicity of different sensors, such as a magnetic field strength sensor 54, an electric field strength sensor 55, and a particulate sensor 56 can be connected thereto.
  • sensors indicate other important environmental factors which aid in the determination of true levels of corrosion, as well as other factors which contribute to corrosive build-up.
  • a comparison step 53 comparing differences in levels of measured corrosion at various times can be performed by means of a comparator, which is well known in the electrical art.
  • a comparator can, in addition, extract information from the data logger 52, as well as extract information from another data logger or another metallic corrosion detector (not shown) .
  • the metallic corrosion detector 48 can comprise a multiplicity of different detectors spatially positioned so as to obtain an accurate spatial profile of the atmosphere of the housing 46.
  • an option of outputting the data is available. Therefore, data relating to corrosion levels experienced by each of the detectors is augmented with information, such as magnetic field strength information, electrical field strength information, and particulate information in order to obtain a more complete scenario of the spatial fitness profile of the environment.
  • comparison steps 32, 44, and 53 can also compare the corrected signals from each of the detectors to a standard, such as a standard determined by the Instrument Society of America (ISA) .
  • a user-predetermined standard can be programmed into the comparator so that the user can determine the standard which the measured levels of corrosion from the detectors are being compared thereto.
  • the corrosion profiling and deterioration system of the present invention can be portably-powered, such as by a battery or a solar cell means. Additionally, measurements of the amount of corrosion experienced by the detector can be real-time, on-line, and continuous measurements.
  • the system can be normally dormant, whereby the system is capable of turning itself on or activating itself at regular or preprogrammed intervals, or when certain atmospheric conditions are detected. For instance, by using an interval timer 55 to activate an "on-off" switch 56 (Fig. 7) , the switch can supply power 58 to the corrosion profiling and diagnostic system, such as the systems of 25, 35, and 45, and after an appropriate warm-up period the system makes a corrosion measurement. Thus, after performing such a measurement, the system is shut down and remains dormant until the next scheduled time interval.
  • Fig. 8 illustrates the graphical concept of interval timing, showing time reflected on a horizontal axis and measurement activity reflected on the vertical axis.
  • time period 60 when the unit is dormant, there is very little power consumed because the corrosion profiling system is dormant, and the only power required is that necessary in order to maintain the activity of the interval timer.
  • the power consumption rises during measurement period 61 because the corrosion profiling system is active during these periods.
  • These time intervals may be of arbitrary frequency and duration, and may be preset by the user. For example, measurements may be hourly, daily, weekly, monthly and so forth.
  • Fig. 9 illustrates one application of the present invention being incorporated and integral to a gas or a chemical purification system, whereby gas or chemical flows in the indicated direction, as shown by the arrows.
  • At least one metallic corrosion detector 65 is positioned upstream of a filtration or purification medium 66, and at least one metallic corrosion detector 68 is placed downstream of the filtration medium 66. With measurements both upstream and downstream of the purification medium, the efficiency and effectiveness of the medium can be determined, as well as the rate at which the purification medium degrades.
  • the apparatus can be used to predict or project the probable lifetime of the purification medium so as to consistently time the replacement of the purification medium assuming that atmospheric conditions remain the same.
  • Figs. 10 and 11 show line graphical representations of the incremental corrosion rate, on the vertical axis, versus the time, on the horizontal axis.
  • the input sensor line reflects readings from at least one metallic corrosion detector, such as detector 65, which is in the stream of gas flow of the atmosphere prior to the gas filtration medium.
  • the output sensor reflects readings from at least one metallic corrosion detector, and can embody metallic corrosion detector 68.
  • Low levels of incremental corrosion rates near the origin of the graph indicates that the purification medium is efficiently and effectively "scrubbing" the corrosive agents out of the stream of gas flow.
  • Fig. 11 illustrates the incremental corrosion rate remaining generally constant at the input sensor upstream of the gas flow before reaching the filtration medium.
  • an electronic computer hardware system 70 is a portable housing, and comprises vents 71 on one of its side walls which allow air to flow through the hardware, such as the circuit boards 72, 74, and 75.
  • a fan 76 usually located on the opposite and opposed side wall from the side wall having the vents 71, of the electronic computer hardware 70 draws air out of the hardware in the direction of the arrows for cooling purposes.
  • the corrosion profiling and diagnostic system 78 can, therefore, be mounted directly on the circuit boards 72, 74, and 75 spaced at different locations on each board.
  • the corrosion profiling system 78 can be located alongside or in the near vicinity of the corrodable elements on a computer system so as to remain stealthy and rather tamper-resistant to an uninformed user of the computer.
  • the corrosion level readings from each of the profiling systems 78 therefore, can then be compared and analyzed so as to determine the spatial fitness profile of the electronic system.
  • the present invention could include other sensors implemented in addition to, or in replacement of, the temperature and humidity sensors.
  • sensors can comprises sensors, such as a sensor for measuring the vibration of elements within the housing, and the like.

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Abstract

Système (25) de mesure et de surveillance de la corrosion comprenant un détecteur (28) de corrosion métallique et au moins un autre détecteur (29) de corrosion métallique qui détecte les niveaux de corrosion en différents endroits et qui génère un signal non corrigé issu de chaque détecteur (28 et 29) de corrosion; des algorithmes d'étalonnage et de correction (30 et 31) qui convertissent le signal non corrigé issu de chaque détecteur de corrosion métallique en un signal corrigé représentant la corrosion réelle; un étage (32) de comparaison qui compare la quantité de corrosion mesurée par chaque détecteur de corrosion; et un enregistreur (34) de données qui stocke les valeurs comparées des quantités de corrosion mesurée. Ces informations sont représentatives du profil spatial de bon état de fonctionnement d'un système soumis à des détériorations induites par l'environnement dans lequel il se trouve.
PCT/US1993/006201 1992-07-02 1993-06-25 Systeme de mesure et de diagnostic de la corrosion Ceased WO1994001757A1 (fr)

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AU46571/93A AU4657193A (en) 1992-07-02 1993-06-25 Corrosion profiling and diagnostic system

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US90785192A 1992-07-02 1992-07-02
US07/907,851 1992-07-02

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WO1994001757A1 true WO1994001757A1 (fr) 1994-01-20

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Cited By (3)

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RU2449264C1 (ru) * 2011-01-11 2012-04-27 Открытое акционерное общество "Иркутский научно-исследовательский и конструкторский институт химического и нефтяного машиностроения" (ОАО "ИркутскНИИхиммаш") Способ мониторинга коррозионного состояния трубопровода
CN104508503A (zh) * 2012-08-23 2015-04-08 通力股份公司 印刷电路装置
JP2017106785A (ja) * 2015-12-08 2017-06-15 東北電力株式会社 銅片による亜鉛系めっき機材の簡易な耐食寿命評価方法

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JP2017106785A (ja) * 2015-12-08 2017-06-15 東北電力株式会社 銅片による亜鉛系めっき機材の簡易な耐食寿命評価方法

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