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WO2002046496A2 - Inhibition de la corrosion au moyen d'aerosols - Google Patents

Inhibition de la corrosion au moyen d'aerosols Download PDF

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Publication number
WO2002046496A2
WO2002046496A2 PCT/EP2001/013786 EP0113786W WO0246496A2 WO 2002046496 A2 WO2002046496 A2 WO 2002046496A2 EP 0113786 W EP0113786 W EP 0113786W WO 0246496 A2 WO0246496 A2 WO 0246496A2
Authority
WO
WIPO (PCT)
Prior art keywords
corrosion
corrosion inhibitors
acid
salts
moist
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/EP2001/013786
Other languages
German (de)
English (en)
Other versions
WO2002046496A3 (fr
Inventor
Steffen RÜSSE
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of WO2002046496A2 publication Critical patent/WO2002046496A2/fr
Anticipated expiration legal-status Critical
Publication of WO2002046496A3 publication Critical patent/WO2002046496A3/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
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors

Definitions

  • the invention relates to a method for inhibiting corrosion of metallic surfaces which are brought into contact with moist gases.
  • metallic surfaces can be found, for example, in exhaust air ducts from companies in which aqueous media are moved and / or sprayed with high turbulence and at the same time a gas, for example air, is pumped or sucked through the system.
  • a special, but not limiting example of this is painting systems, for example in vehicle construction. In such systems, paint overspray is washed out of the exhaust air by water.
  • the resulting exhaust air is a stream of a moist gas, which contains water at least in gaseous form, but usually also in the form of an aerosol.
  • the stream of the moist gas contains inorganic salts and possibly organic components that are carried along with the aerosol. These inorganic salts and possibly organic components are deposited on the surfaces of the exhaust air ducts. Together with the dampness which is also deposited, they can cause corrosion damage, as will be described in more detail below.
  • the object of the invention is to provide an effective method for controlling the corrosion of metal surfaces which are in contact with a moist gas.
  • the invention relates to a method for inhibiting corrosion of metallic surfaces that come into contact with moist gases are brought, with the moist gases being added corrosion inhibitors in the form of an aerosol.
  • the moist gases are generally an exhaust air stream which contains water in gaseous form and / or in the form of an aerosol.
  • Such a moist exhaust air flow generally occurs when air is pumped or sucked through a system in which water is kept in turbulent motion and / or sprayed. For example, this occurs in gas scrubbers in which contaminants are to be removed from a gas stream by sprayed water.
  • Another example are exhaust air ducts from paint shops, where paint particles in the exhaust air are washed out by water.
  • the metallic surfaces can be selected, for example, from steel, zinc, galvanized steel or aluminum. Alloys of the metals mentioned are also included. Steel is in particular stainless steel, for example type 1.4301. The method is particularly suitable for use on metallic surfaces of exhaust air ducts in paint shops.
  • the corrosion inhibitors in the form of an aerosol can be added to the moist gas stream (exhaust air stream) shortly before or in the ventilator itself.
  • the anti-corrosion agent is entrained and reaches precisely those problem areas where corrosion by salting takes place.
  • the corrosion inhibitors are preferably added to the gas stream in the form of an aqueous solution or dispersion and suitable measures are taken to ensure that droplets of this aqueous solution and / or dispersion in the form of an aerosol are entrained in the moist gas stream. This can be achieved, for example, by spraying or injecting the solution or dispersion of the corrosion inhibitors into the gas stream continuously or discontinuously.
  • the corrosion inhibitors can be selected from a) polymeric amino acids, in particular polyaspartic acid, or their salts, b) carboxylic acids with 6 to 24, in particular with 6 to 9 C atoms, or their salts, c) organic amines, in particular alkanolamines, or their Salts, d) metal compounds, in particular compounds of zinc, molybdenum and / or tungsten, the latter two preferably in oxidation state VI, e) polymeric carboxylic acids other than polyamino acids, in particular polymers or copolymers of acrylic acid, methacrylic acid, maleic acid and partially saponified polyacrylamides, or in each case their salts, f) organic phosphonic acids, in particular geminal diphosphonic acids and phosphonocarboxylic acids such as, for example, 1-hydroxye
  • Suitable corrosion inhibitors of group b) are, for example, carboxylic acids of the formula (I)
  • Ph-COCH CH group
  • R ⁇ is a linear or branched alkyl radical having 8 to 18 carbon atoms and Ph is a phenyl group.
  • Typical examples are the fatty acids caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, palmoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, elaeostearic acid, arachidic acid, gadoleic acid, arachidonic acid, behenic acid Erucic acid and clupanodonic acid as well as their technical mixtures, such as those that occur in the pressure splitting of natural fats and oils.
  • Carboxylic acids of the formula (I) are preferably used in which R 3 represents alkyl radicals having 5 to 17 and in particular having 5 to 8 carbon atoms.
  • substituted carboxylic acids examples include in the group of alkylbenzoylacrylic acids.
  • An example is 3- (p-1)
  • Anionic surfactants of the petroleum sulfonate type can be considered as group g) of corrosion inhibitors. These are sulfoxidation products of paraffin fractions with an average of 6 to 30, in particular 10 to 20, carbon atoms.
  • the petroleum sulfonates can also be regarded as secondary alkane sulfonates, with alkali or alkaline earth metals, ammonium or alkylammonium being suitable as counterions.
  • the petroleum sulfonates are preferably used in the form of their sodium or calcium salts.
  • the corrosion inhibitors of the individual groups can be combined with one another, for example group b) with group c) or group d) with group e) and / or group f).
  • Corrosion inhibitors which are Brönstedt acids, are preferably used in the form of their water-soluble salts, in particular in the form of alkali metal or amine salts.
  • the pH of the aqueous solution or dispersion of the corrosion inhibitors is in the particularly effective range from about 7 to about 10.
  • Spreading agents are preferably added to the moist gas as an aerosol. This can be done together with the addition of the corrosion inhibitors, but also separately from these.
  • Surfactants such as surfactants are particularly suitable as spreading agents. These spreading agents are also deposited on the metallic surfaces and reduce the surface tension of the moisture film on these surfaces. As a result, the corrosion inhibitors get into gaps more easily and can easily infiltrate old deposits. In addition, these spreading agents have a cleaning effect, so that regular cleaning operations are facilitated.
  • Alkalinity carriers can also be added to the moist gas, which preferably also takes the form of an aerosol.
  • the effect of the alkalinity carriers is that the acids formed on the metallic surfaces by biodegradation of entrained organic substances are neutralized. The corrosion effect of such acids is therefore reduced.
  • the alkalinity carriers can generally be alkalis such as sodium hydroxide.
  • alkaline carriers are preferred, which in turn contribute to the corrosion protection effect. Examples of such alkalinity carriers are soaps and organic amines, especially alkanolamines.
  • the corrosion inhibitors are preferably added to the moist gas in an amount such as an aerosol that one m 3 of the moist gas, for example the exhaust air, contains 1 ⁇ g to 10 mg, preferably 10 ⁇ g to 1 mg, corrosion inhibitor.
  • the aqueous solution or dispersion of the corrosion inhibitors, which are added as aerosols to the moist gas preferably contains the corrosion inhibitors in a concentration of 0.1 to 20% by weight, in particular 1 to 5% by weight.
  • the method according to the invention effectively reduces the corrosion problems described at the outset on metallic surfaces which are in contact with moist gases. This extends the intervals for maintenance measures or the renewal of the systems and thereby increases their efficiency.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

L'invention concerne un procédé d'inhibition de la corrosion de surfaces métalliques qui sont mises en contact avec des gaz humides. Ce procédé consiste à ajouter aux gaz humides des inhibiteurs de corrosion sous forme d'aérosol. Les surfaces métalliques se rapportent de préférence à des canaux d'évacuation d'air de cabines de laquage.
PCT/EP2001/013786 2000-12-06 2001-11-27 Inhibition de la corrosion au moyen d'aerosols Ceased WO2002046496A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10060530.3 2000-12-06
DE2000160530 DE10060530A1 (de) 2000-12-06 2000-12-06 Korrosionsinhibierung durch Aerosole

Publications (2)

Publication Number Publication Date
WO2002046496A2 true WO2002046496A2 (fr) 2002-06-13
WO2002046496A3 WO2002046496A3 (fr) 2003-08-28

Family

ID=7665945

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/013786 Ceased WO2002046496A2 (fr) 2000-12-06 2001-11-27 Inhibition de la corrosion au moyen d'aerosols

Country Status (2)

Country Link
DE (1) DE10060530A1 (fr)
WO (1) WO2002046496A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553610A (zh) * 2019-09-10 2021-03-26 天津大学 一种碳钢表面原位自组装金属-聚天冬氨酸防腐薄膜及其制备方法和应用

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE892264C (de) * 1946-05-07 1954-01-11 Bataafsche Petroleum Verfahren zum Schuetzen von Metallen gegen Korrosion, nichtkorrosives Verpackungsmaterial und dessen Herstellung
US2717196A (en) * 1950-02-25 1955-09-06 Shell Dev Sheet wrapping material containing nitro-phenol compound
US2947599A (en) * 1955-07-05 1960-08-02 Little Inc A Corrosion inhibitors
DE1521900A1 (de) * 1964-10-03 1969-05-14 Nawrot Kg Hermann Korrosionsschutzmittel und Verfahren zu dessen Herstellung
US3749554A (en) * 1970-06-08 1973-07-31 Union Oil Co Method for reducing erosion and corrosion of metal surfaces
US3689238A (en) * 1970-10-16 1972-09-05 Universal Oil Prod Co Inhibitor injection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112553610A (zh) * 2019-09-10 2021-03-26 天津大学 一种碳钢表面原位自组装金属-聚天冬氨酸防腐薄膜及其制备方法和应用

Also Published As

Publication number Publication date
WO2002046496A3 (fr) 2003-08-28
DE10060530A1 (de) 2002-06-13

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