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WO2006115552A2 - Traitement antirouille utilisant une petitetm flamme de gaz - Google Patents

Traitement antirouille utilisant une petitetm flamme de gaz Download PDF

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Publication number
WO2006115552A2
WO2006115552A2 PCT/US2006/000804 US2006000804W WO2006115552A2 WO 2006115552 A2 WO2006115552 A2 WO 2006115552A2 US 2006000804 W US2006000804 W US 2006000804W WO 2006115552 A2 WO2006115552 A2 WO 2006115552A2
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WO
WIPO (PCT)
Prior art keywords
flame
rust
steel material
gas
treated
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/US2006/000804
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English (en)
Other versions
WO2006115552A3 (fr
Inventor
Dennis Klein
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.)
Hydrogen Technology Applications Inc
Original Assignee
Hydrogen Technology Applications 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 Hydrogen Technology Applications Inc filed Critical Hydrogen Technology Applications Inc
Publication of WO2006115552A2 publication Critical patent/WO2006115552A2/fr
Anticipated expiration legal-status Critical
Publication of WO2006115552A3 publication Critical patent/WO2006115552A3/fr
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F15/00—Other methods of preventing corrosion or incrustation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames

Definitions

  • This invention involves basic aspects of metallurgy, but it appropriately is in the field of rust and corrosion prevention and remediation, and more specifically it discloses and illustrates a method of remedying and of metals, mainly rusting of steel.
  • Steel in various forms is the most widely used metal throughout the industrialized world. It is produced from various forms of iron ore, most commonly hemite (Fe2 ⁇ 3) under high temperatures in blast furnaces.
  • the critical step and key reaction is the reduction of elemental iron and carbon dioxide gas at about 1540 0 C to yield liquid, elemental iron and carbon dioxide gas.
  • the resultant metal product is common cast iron or pig iron. It contains approximately 1% carbon and is highly susceptible to rusting and other corrosive forces. Iron alloys tend to resist corrosive processes. Stainless steel, an alloy with up to 30% chromium and a small fraction of nickel is highly rust and corrosion resistant. Steel with higher concentrations of carbon are harder than pig iron but tend to be susceptible corrosion to and formation of rust.
  • Rust is the product of corrosion, the oxidative deterioration of metal. Empirically, the process is relatively simple. Iron (Fe 3+ ) is oxidized to yield hydrated iron (III) oxide, of the form approximately Fe 2 O 3 -H 2 O.
  • the droplet of water provides an aqueous phase which provides for the movement of iron (Fe 2+ ) from the anode region to be accumulated and deposited in its oxidized form as hydrated iron oxide (Fe 2 O 3 -H 2 O).
  • iron Fe 2+
  • hydrated iron oxide Fe 2 O 3 -H 2 O
  • rust prevention is accomplished by distributing the formation of the minute galvanic cell, or by destroying such cells before a significant magnitude or degree of corrosion occurs.
  • Rusting appears to be a cumulative, accelerating process.
  • the initial formation or deposition of rust accelerates the rate of continued deposition. This is in part explained by the roughened surface of rust accumulation resulting in, among other things, increased sites for the formation of galvanic cells and exposure to oxygen owing to increased surface area of the rusted surface.
  • Rust prevention most frequently involves applying a protective coating to iron surfaces to inhibit the aqueous phase of the galvanic process. Frequently, physical removal (scraping, sanding, or buffing) of existing rust accumulations to smooth surfaces and remove accumulations of rust precede the coating process.
  • the most common coating is some form of metal, rust inhibiting paint that protects the metal surface for exposure to oxygen and minimizes droplet formation directly on the iron surface.
  • Other coating processes are used, including applying coatings of other, less rust susceptible materials such as zinc, to yield galvanized steel, or the use of stainless steel, which is iron with a relative high content of chromium plus a small amount of nickel. Although iron with high carbon content is harder than pig iron, it is not markedly less susceptible to corrosive forces.
  • Rust remains a significant economic and safety problem. Many current efforts focus on surface treatments to inhibit rust formation. For example, US patent No. 6,562,474 issued May 13, 2003 to Yoshimi, et al. describes and claims both a method of coating steel sheets with a zinc or zinc alloy material to reduce corrosion and the resulting protected steel sheets. Uramoto, et al. in US patent No. 4,642,011 issued February 10, 1987 described a composition comprising an organic silicon compound that inhibited rust formation of threaded metal elements to which it was applied.
  • a purpose and objective of the invention is a method to inhibit rust formation of steel materials by exposing the material to a flame produced by unique hydrogen fuel or gas.
  • An additional purpose and objective of the invention is a method to remove rust from corroded iron materials by exposing such materials to a flame produced by a unique hydrogen fuel or gas.
  • a still further purpose and objective of the invention is a method to inhibit galvanic processes on the surface of iron that contribute to the formation of rust or to corrosive processes.
  • the invention is a method to remove and/or to inhibit corrosion of steel materials comprising: providing means for delivering a flame to a steel material, said means including a hydrogen and oxygen gas generator system; generating said hydrogen and oxygen gas as a source of fuel for the flame; treating said steel material by applying a flame to a desired area of the steel material to be treated; and traversing the area of the steel material to be treated with said flame at a desired rate sufficient to remove surface rust, if any, and to inhibit corrosion of said steel material, wherein said treating of the steel material causes changes in said treated areas of the steel material so as to inhibit galvanic processes that cause corrosion.
  • the flame is applied using a welding tip of a predetermined size.
  • the flame is applied from a predetermined distance above the area of the steel material to be treated.
  • Fig.l schematically describes the general features of a mixed gas generator that that produces and utilizes the hydrogen and oxygen gases used in the present invention.
  • Fig. 2 schematically illustrates rust removal and prevention results on a carbon steel sample in response to a flame treatment using the unique gas produced from the mixed gas generator similar to that schematically depicted in Fig. 1.
  • Fig. 3 schematically illustrates rust removal and prevention along a cut edge of a sample of pig iron in response to the flame treatment method of the present invention.
  • Fig. 4 schematically illustrates rust removal from the surface of a sample of carbon steel and the resultant inhibition of rust formation in conditions normally favoring corrosion.
  • Gas welding systems that combine oxygen and acetylene gas to produce a variable temperature flame for gas welding are well known to those of average skill in the art.
  • the present invention utilizes a flame produced by a novel gas produced in a novel manner.
  • the fuel source for the welding flame is the hydrogen and oxygen gas mixture produced by a hydrogen gas and oxygen gas generator, which is part of the welder/flame generating system described above.
  • An electrolyte solution is processed by the generator to yield oxygen gas and hydrogen gas.
  • the two gasses are transferred to and stored as a single gas from which they are delivered (pumped) as a sole fuel source to a welding torch with a specific tip. Gas is delivered at a specific pressure and rates compatible with the tip in use.
  • the incorporated U.S. Patent No. 6,689,259 provides full and complete details of all aspects of a welder/flame generating system, including pumps, valves, and pressure control means from which Fig. 1 provides a brief summary as background material in explanation in part of Examples 1, 2, and 3 as illustrated by Figs. 2, 3 and 4 respectively.
  • the device or system 10 comprises a hydrogen oxygen generator 12, an electrolyte reservoir 14 with an electrolyte 16, a gas storage tank 18, gas reservoir 20, welder unit 22 with gas delivery hose 24 and welding handle and tip 26.
  • Electrolyte 16 is pumped from the electrolyte storage reservoir 14 to the hydrogen and oxygen gas generator 12 as indicated by arrow head 28.
  • the hydrogen and oxygen generator splits gas water in the presence of the electrolyte 16 to yield hydrogen gas (H 2 ) and oxygen gas (O 2 ).
  • the mixed gasses are transported 30 to the upper region of the electrolyte chamber 32.
  • Hydrogen and oxygen gas mixture may be delivered 33 to the welder 22 and transmitted by the hose 24 for combustion at the tip 26, or transmitted 34 for storage to a tank 18, thence 36 to the gas reservoir 20 from which the gas may be transmitted 38 to welder 22 for combustion as previously described.
  • the fuel is delivered as a single mixture of oxygen gas and hydrogen gas in a fixed proportion of approximately 2:1 hydrogen to oxygen.
  • a second hose may deliver oxygen that is not used in the combustion process, but is used to "blow” debris (slag) from the work area.
  • Fig. 2 is presented to illustrate the effects of the treatment of metal (iron) on rust removal and formation resulting from a flamed fueled by the gas described above and supplied by a gas welder system essentially as depicted in Fig. 1 and the accompanying descriptions.
  • the flame produced was passed across the surface of a sample 40 of rusted carbon steel approximately .75 in (1.9 cm) thick.
  • the flame was delivered by vector brazing tip size 0.
  • No pretreatment was applied at ambient temperature of 81 0 F (94.5 0 C) and relative humidity exceeding 50 percent.
  • No other gas was used in any phase of the treatment or as a post-treatment. Gas was delivered at 25 PSI and the flame moved across the surface of the sample at about 0.25 inches every 3 seconds, or 11 cm per minute.
  • the speed of the passing of the flame over the surface of the steel can typically vary with the tip size adapted to the torch. Torch speed can also vary depending on the amount of rusi/corrosion present on the metal to be treated, for example new carbon steel with little oxidation could be treated quickly, or as part of production process as a pre-corrosion process to prevent or stop the normal rust/corrosion that occurs.
  • the initial rusted surface 44 is contrasted by a bright, silver-white surface 42 essentially the width of the flame applied along the full length of the application. Note shorter segments of treatment 46 and 48 illustrated the same silver- white sheen. Removal of the rust was essentially instantaneous. The rust inhibiting effect is illustrated by the fact that the rust- free areas depicted by regions (treated surfaces) 42, 46 and 48 maintained the appearance for 30 months following treatment based on observations with 1OX macroscopic observation to confirm observations of freedom from rust, and based on observations with the unaided eye. Untreated areas 44 continued to accumulate rust during the 30 month observation period following the flame treatment. The observed post-treatment samples were exposed to "normal" ambient, corrosive, conditions of Florida.
  • the conversion was a direct function of the flaming treatment or application.
  • the flame did not traverse the full length of the metal sample, the bright, rust free region extended minimally beyond the path of the flame.
  • the width of the rust free area was essentially equal to the width of the flame treatment.
  • the unique flame could have affected the distribution of anode and cathode regions on the metallic surface, thereby disrupting essential electron flow; microscopic changes in the metal's surface cannot be excluded. In either case, one thing is certain, the result of the treatment is significant and dramatic.
  • Fig. 3 illustrates the removal and inhibition of rust resulting from flame treatment similar to that of Example 1.
  • the sample 40 is a piece of low carbon (pig) iron 1 in. x 25 in. x 0.75 in. (2.54 x 73 x 19 cm).
  • Interest in this example is on the cut surface or treated surface 42 of the sample.
  • the sample was cut from a uniform sheet of material using a cutting (welding) torch with a size 4 cutting tip and the gas delivered at 28 PSI. The cutting was accomplished approximately 25 % faster than expected using standard oxy-acetylene technology.
  • the cut edge 42 displayed the same bright silver- white sheen described in Example 1.
  • the cut edge remains essentially rust free with a bright, silver-white sheen. Untreated areas of the sample continue to accumulate rust under storage conditions of ambient temperature and humidity in Florida.
  • Example 2 as in Example 1, the actual treatment, cutting in Example 2, was accomplished with a flame fueled exclusively with hydrogen and oxygen mixed gas generator described above; however, in Example 2, a separate hose delivered oxygen to the cutting site exclusively to "blow" slag and cutting debris from the work site. There is no reason to expect that the oxygen affected the cutting or rust prevention processes.
  • Fig. 4 illustrates the effect flame treatment of metal on rust removal and prevention.
  • the flame was fueled by the hydrogen and oxygen generated mixed gas and delivered by a welding device essentially as described for Fig. 1.
  • the flame was applied with a size 0 victor tip with gas delivered at approximately 20 PSI.
  • the cone of the flame was approximately 2 inches (5 cm) and the flame traversed the surface of the sample piece at a uniform distance of approximately 0.125 in. (0.3 cm) from the sample surface.
  • the sample piece 40 was a .75 in. (1.9 cm) carbon steel strip with a generally uniform rusted surface 44. Exposing the steel surface to the gas flame resulted in essentially immediate removal of rust and the metal displayed the silver- white 44 sheen previously described in Example 2 and 3. Following treatment, the sample was submerged in a salt (sodium chloride) water solution at room temperature for 60 days. Upon removal, the treated areas appeared to be discolored, but not significantly rusted. The discoloration was removed by gently brushing with a tooth brush. Subsequently, no rust formed during the observation period of 30 months.
  • a salt sodium chloride

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

L'invention concerne un procédé permettant d'enlever la rouille existante et d'inhiber la formation de la rouille en traitant les surfaces d'acier avec une flamme obtenue par la combustion d'un gaz unique qui est un mélange de gaz d'hydrogène et de gaz d'oxygène.
PCT/US2006/000804 2005-04-22 2006-01-11 Traitement antirouille utilisant une petitetm flamme de gaz Ceased WO2006115552A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/112,541 2005-04-22
US11/112,541 US20060032555A1 (en) 2004-08-16 2005-04-22 Anti-rust treatment using KLEIN™ gas flame

Publications (2)

Publication Number Publication Date
WO2006115552A2 true WO2006115552A2 (fr) 2006-11-02
WO2006115552A3 WO2006115552A3 (fr) 2007-11-29

Family

ID=37215169

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/000804 Ceased WO2006115552A2 (fr) 2005-04-22 2006-01-11 Traitement antirouille utilisant une petitetm flamme de gaz

Country Status (2)

Country Link
US (1) US20060032555A1 (fr)
WO (1) WO2006115552A2 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2125175A (en) * 1933-10-28 1938-07-26 Union Carbide & Carbon Corp Method of removing metal from the surfaces of billets or similar metal bodies, and the product
US2741565A (en) * 1951-11-01 1956-04-10 Parker Halversen Company Method for forming a protective glaze on a surface
US3356600A (en) * 1964-12-24 1967-12-05 Henes Mfg Co Means and method for producing a dry homogeneously mixed hydrogen and oxygen fuel gas for torches
US4081656A (en) * 1973-07-20 1978-03-28 Yull Brown Arc-assisted oxy/hydrogen welding
US4014777A (en) * 1973-07-20 1977-03-29 Yull Brown Welding
US4642011A (en) * 1982-11-22 1987-02-10 Toacosei Chemical Industry Co., Ltd. Composition for rust prevention of metals and threaded metal elements with a rustproof film
US5075255A (en) * 1991-02-27 1991-12-24 Motorola, Inc. Method of removing contaminants from a plated article with a clean burning hydrogen flame
US6689259B1 (en) * 1998-01-30 2004-02-10 Dennis Klein Mixed gas generator
DE69934780T2 (de) * 1998-11-08 2007-10-18 Jfe Steel Corp. Oberflächenbehandeltes stahlblech mit hervorragendem korrosionwiderstand

Also Published As

Publication number Publication date
US20060032555A1 (en) 2006-02-16
WO2006115552A3 (fr) 2007-11-29

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