EP0177086A1 - Verfahren zur Behandlung von Metalloberflächen - Google Patents
Verfahren zur Behandlung von Metalloberflächen Download PDFInfo
- Publication number
- EP0177086A1 EP0177086A1 EP85201480A EP85201480A EP0177086A1 EP 0177086 A1 EP0177086 A1 EP 0177086A1 EP 85201480 A EP85201480 A EP 85201480A EP 85201480 A EP85201480 A EP 85201480A EP 0177086 A1 EP0177086 A1 EP 0177086A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chromium
- agent
- chromating
- chromating agent
- treatment
- 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.)
- Withdrawn
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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/24—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds
- C23C22/30—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing hexavalent chromium compounds containing also trivalent chromium
Definitions
- the invention relates to a process for the treatment of metal surfaces by applying a chromating agent which contains chromium VI, chromium III ions and at least 5 g / 1 silica and / or silicate and is free from reducing agents.
- the coating is formed by drying the treatment solution.
- the shape of the objects to be treated influences the result by e.g. strongly convex areas are not adequately layered.
- the chromating process described in GB-PS 1 234 181 leads to drying of the treatment solution on smooth surfaces, e.g. on steel strip, to very good results, however, the layer formation on strongly curved surfaces is unsatisfactory.
- the object of the invention is to provide a method for the treatment of To provide metal surfaces, which does not have the aforementioned disadvantages, allows the treatment of outdoor structures of any shape and yet is easy to implement.
- the object is achieved by designing the method of the type mentioned at the outset in accordance with the invention in such a way that a chromating agent is applied which contains organic solvent and organic thickener.
- the chromating agent used in the process according to the invention is in particular stable and can have a consistency which is variable within wide limits and which allows application from spraying on to brushing on or brushing on.
- the organic solvents to be used must be resistant to chromium VI compounds. They should preferably be non-toxic and - with a view to a short drying time - sufficiently volatile.
- a chromating agent is applied which contains N-methyl-2-pyrrolidone as the organic solvent. The amounts are preferably 25 to 200 g / l, in particular 70 to 150 g / l.
- the organic thickener which together with the silica and / or the silicate causes the thickening, should be able to increase the consistency until it can be brushed on or brushed on. It must be compatible with the organic solvent and the other components of the chromating agent.
- a chromating agent is preferably applied which contains polyvinylpyrrolidone as the organic thickening agent. The preferred amounts are 10 to 100 g / l, in particular 30 to 75 g / l.
- the chromating agent contains a surfactant that facilitates application, especially when the metal surfaces are dirty.
- the surfactant must also have the necessary stability. It is usually of the nonionic type and is particularly effective, in particular in combination with anionic surfactants, which are advantageously introduced as a sodium compound. Ethylene oxide adducts are particularly suitable as the nonionic surfactant and sodium lauryl sulfate is particularly suitable as the anionic surfactant.
- the amount of the surfactant can be up to 100 g / 1. A content of 5 to 50 g / 1 is preferred.
- the adhesion of the coating to the metal surface can be improved if a compound of a monovalent metal - as described in GB-PS 1 234 181 - or a divalent metal which does not reduce hexavalent chromium is incorporated into the chromating agent.
- Suitable monovalent cations are sodium and potassium. Calcium, magnesium, strontium, barium and nickel, but especially zinc, can be used as divalent cations.
- the amount of mono- or divalent cations can be up to 3 g / 1. The range of 0.05 to 2.5 g / l is preferred.
- the weight ratio of hexavalent chromium - calculated as' Cro 3 - to mono- or polyvalent cation is usually in the range from 5: 1 to 100: 1.
- the chromating agent may otherwise be of the type described in GB-PS 1,234,181. So the pH will preferably be below 4 and generally above 2. The pH range from 2.5 to 3.5 is preferred. The amount of silica and / or silicate is advantageously 5 to 100 g / l. The preferred entry is as pyrogenic or precipitated silica, e.g. with the trade name AEROSIL. However, the other substances described in the GB-PS are also suitable.
- the chromating agent to be used in the process according to the invention is usually produced by partial reduction of an aqueous solution of chromic acid, which may already contain some or all of the other components.
- the chromic acid can also be partially neutralized, ie partially contain water-soluble chromate or bichromate, for example sodium or potassium. Nevertheless, the aqueous solution must be strongly acidic and - before the reduction - have a pH below 2, preferably below 1.5.
- the solution should contain at least 5 g / l, most advantageously 100 to 500 g / l, chromium VI - calculated as Cr0 3 .
- part of the chromium VI is reduced to chromium III using a suitable amount of reducing agent, possibly under the action of heat, so that when the reduction is complete, the chromium VI and chromium III ions, optionally in whole or in part in the form of chromium chromate.
- the chromium VI: total chromium weight ratio in the chromating agent should be between 0.5: 1 and 0.75: 1.
- the amount of total chromium (calculated as Cr0 3 ) is usually 5 to 40, preferably 10 to 40 g / l.
- the content of hexavalent chromium is preferably 5 to 30 g / l - calculated as CrO 3 . If there is an intention to apply a corrosion-protective coating which is then painted, the ratio of chromium VI: total chromium should be as close as possible to 0. 5: 1, insofar as the formation of a precipitate allows this. Generally the ratio will be 0.55: 1 to 0.63: 1.
- the amount of reducing agent results from the intended degree of reduction and its reducing power.
- the reducing agent should be such that the effectiveness of the chromating agent does not deteriorate when it is oxidized form impairing substances. Sulfur-containing reducing agents are therefore advantageously avoided.
- Organic reducing agents are preferred because of the mostly harmless by-products.
- Particularly suitable reducing agents are sugars such as dextrose, glucose and sucrose, starch, alcohols such as methanol, ethanol, ethylene glycol, polyethylene glycol, glycerol, mannitol, sorbitol, alkylolamines such as triethanolamine, hydroquinone.
- Hydroxylamine but possibly not as sulfate, and phosphorous acid can be used as the inorganic reducing agent.
- the usual method of application for the chromating agent to be used according to the invention is brushing or brushing on. Then the chromating agent is allowed to dry in air or under the influence of heat. A subsequent rinsing with water is generally not carried out.
- Aluminum, magnesium, zinc, galvanized steel, but in particular steel itself, and alloys of the aforementioned metals can be treated by the process according to the invention.
- the method according to the invention is particularly advantageous for the treatment of structures which are located outdoors or are to be erected, preferably when laying pipelines, for the treatment of connecting elements therefor and for the repair of damaged coatings of such structures.
- the coatings produced by the method according to the invention are also suitable as a basis for adhesives, for example based on epoxy resin, for connecting metal surfaces to one another (for example in the motor industry).
- the coatings produced also form an excellent basis for painting pipelines and the like with epoxy resin and are more durable than conventional coatings.
- Farther chromating agents used in the process according to the invention are stable over a considerable period of time, for example over several months. If the coatings produced are provided with paint or varnish and the like, they considerably improve their liability.
- a chromating agent was produced which, in parts by weight, contained the following components:
- the chromating agent could easily be brushed onto profiled steel structures such as connecting elements. After drying in the atmosphere, a substantially uniform coating was obtained. A conventional varnish applied afterwards showed satisfactory adhesion.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB848424159A GB8424159D0 (en) | 1984-09-25 | 1984-09-25 | Cromate coatings for metals |
GB8424159 | 1984-09-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0177086A1 true EP0177086A1 (de) | 1986-04-09 |
Family
ID=10567207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85201480A Withdrawn EP0177086A1 (de) | 1984-09-25 | 1985-09-17 | Verfahren zur Behandlung von Metalloberflächen |
Country Status (7)
Country | Link |
---|---|
US (1) | US4644029A (pt) |
EP (1) | EP0177086A1 (pt) |
JP (1) | JPS6184382A (pt) |
AU (1) | AU580333B2 (pt) |
BR (1) | BR8504719A (pt) |
GB (2) | GB8424159D0 (pt) |
NZ (1) | NZ213440A (pt) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0246578A1 (de) * | 1986-05-20 | 1987-11-25 | Nihon Parkerizing Co., Ltd. | Verfahren zur Behandlung von Wärmeaustauscherflächen |
GB2201157A (en) * | 1986-12-23 | 1988-08-24 | Albright & Wilson | Silica products for treating surfaces |
FR2654117A1 (fr) * | 1989-11-06 | 1991-05-10 | Produits Ind Cie Fse | Procede propre a conferer a un substrat metallique un revetement protecteur a base de chrome hexavalent, bain mis en óoeuvre dans ce procede et forme commerciale des constituants du bain. |
EP0486476A2 (en) * | 1986-12-23 | 1992-05-20 | ALBRIGHT & WILSON LIMITED | Processes and products for surface treatment |
EP0877832A2 (en) * | 1995-11-30 | 1998-11-18 | Henkel Corporation | Chromate treatment bath composition and process for application to metals |
US6149735A (en) * | 1995-11-30 | 2000-11-21 | Henkel Corporation | Chromate treatment bath composition and process for application to metals |
DE4402587C2 (de) * | 1993-07-29 | 2003-04-17 | Kawasaki Steel Co | Chromatiertes Metallblech mit hoher Korrosionsbeständigkeit, das eine verbesserte Gleitfähigkeit und elektrische Leitfähigkeit aufweist |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS621882A (ja) * | 1985-06-26 | 1987-01-07 | Nippon Light Metal Co Ltd | アルミニウム材用耐食親水性皮膜形成材 |
DE3712422C1 (de) * | 1987-04-10 | 1988-08-04 | Mannesmann Ag | Verfahren und Vorrichtung zum Auftragen eines fluessigen Behandlungsmittels auf Stahlrohre |
AU2067600A (en) * | 1994-12-23 | 2000-05-18 | Henkel Corporation | A no-rinse method for repairing coated surfaces |
US6033495A (en) * | 1997-01-31 | 2000-03-07 | Elisha Technologies Co Llc | Aqueous gel compositions and use thereof |
US6190464B1 (en) * | 1998-09-24 | 2001-02-20 | Nisshin Steel Co., Ltd. | Chromating solution and chromated metal sheet |
JP5219011B2 (ja) * | 1999-11-10 | 2013-06-26 | 日本表面化学株式会社 | 表面処理液、表面処理剤及び表面処理方法 |
US9051651B2 (en) * | 2005-11-14 | 2015-06-09 | Otis Elevator Company | Elevator load bearing member having a conversion coating on tension member |
ES2381213T3 (es) * | 2006-02-14 | 2012-05-24 | Henkel Ag & Co. Kgaa | Composición y procesos de fabricación de un recubrimiento de cromo trivalente, resistente a la corrosión, secado "in situ", para aplicar sobre superficies metálicas |
WO2007134152A1 (en) * | 2006-05-10 | 2007-11-22 | Henkel Ag & Co. Kgaa. | Improved trivalent chromium-containing composition for use in corrosion resistant coating on metal surfaces |
KR20190112831A (ko) | 2012-01-27 | 2019-10-07 | 후루카와 덴끼고교 가부시키가이샤 | 열 수송 장치 |
US10156016B2 (en) | 2013-03-15 | 2018-12-18 | Henkel Ag & Co. Kgaa | Trivalent chromium-containing composition for aluminum and aluminum alloys |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1234181A (pt) * | 1967-06-14 | 1971-06-03 | ||
US3935035A (en) * | 1973-06-05 | 1976-01-27 | Nippon Steel Corporation | Aqueous solution and method for surface treatment of metals |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3053691A (en) * | 1958-01-29 | 1962-09-11 | Allied Res Products Inc | Protective coating |
US3451865A (en) * | 1966-06-03 | 1969-06-24 | Lubrizol Corp | Corrosion-proofing primer coating and metal article coated therewith |
US3993510A (en) * | 1975-05-21 | 1976-11-23 | The United States Of America As Represented By The Secretary Of The Navy | Thixotropic chemical conversion material for corrosion protection of aluminum and aluminum alloys |
US4161409A (en) * | 1978-03-06 | 1979-07-17 | Louis Schiffman | Corrosion inhibitive pigment |
US4548646A (en) * | 1982-11-15 | 1985-10-22 | Sermatech International Incorporated | Thixotropic coating compositions and methods |
JPS59197575A (ja) * | 1983-04-19 | 1984-11-09 | Nippon Paint Co Ltd | 耐食性金属表面処理用組成物 |
-
1984
- 1984-09-25 GB GB848424159A patent/GB8424159D0/en active Pending
-
1985
- 1985-09-09 US US06/773,483 patent/US4644029A/en not_active Expired - Fee Related
- 1985-09-11 NZ NZ213440A patent/NZ213440A/en unknown
- 1985-09-13 AU AU47431/85A patent/AU580333B2/en not_active Ceased
- 1985-09-17 EP EP85201480A patent/EP0177086A1/de not_active Withdrawn
- 1985-09-24 GB GB08523573A patent/GB2164956B/en not_active Expired
- 1985-09-25 BR BR8504719A patent/BR8504719A/pt unknown
- 1985-09-25 JP JP60212010A patent/JPS6184382A/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1234181A (pt) * | 1967-06-14 | 1971-06-03 | ||
US3935035A (en) * | 1973-06-05 | 1976-01-27 | Nippon Steel Corporation | Aqueous solution and method for surface treatment of metals |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, unexamined applications, C field, vol. 6, no. 149, August 10, 1982 THE PATENT OFFICE JAPANESE GOVERNMENT page 104 C 118 * JP - A - 57--70 282 ( KAWASAKI SEITETSU K.K: ) * * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0246578A1 (de) * | 1986-05-20 | 1987-11-25 | Nihon Parkerizing Co., Ltd. | Verfahren zur Behandlung von Wärmeaustauscherflächen |
DE3716440A1 (de) * | 1986-05-20 | 1987-11-26 | Nihon Parkerizing | Verfahren zur behandlung von waermeaustauscherflaechen |
GB2201157A (en) * | 1986-12-23 | 1988-08-24 | Albright & Wilson | Silica products for treating surfaces |
GB2201157B (en) * | 1986-12-23 | 1991-07-17 | Albright & Wilson | Processes and products for surface treatment |
EP0486476A2 (en) * | 1986-12-23 | 1992-05-20 | ALBRIGHT & WILSON LIMITED | Processes and products for surface treatment |
EP0486476A3 (en) * | 1986-12-23 | 1992-08-12 | Albright & Wilson Limited | Processes and products for surface treatment |
FR2654117A1 (fr) * | 1989-11-06 | 1991-05-10 | Produits Ind Cie Fse | Procede propre a conferer a un substrat metallique un revetement protecteur a base de chrome hexavalent, bain mis en óoeuvre dans ce procede et forme commerciale des constituants du bain. |
EP0436408A1 (fr) * | 1989-11-06 | 1991-07-10 | Compagnie Francaise De Produits Industriels | Procédé et bain pour appliquer un revêtement protecteur à base de chrome hexavalent sur un substrat métallique, et forme commerciale des constituants du bain |
DE4402587C2 (de) * | 1993-07-29 | 2003-04-17 | Kawasaki Steel Co | Chromatiertes Metallblech mit hoher Korrosionsbeständigkeit, das eine verbesserte Gleitfähigkeit und elektrische Leitfähigkeit aufweist |
EP0877832A2 (en) * | 1995-11-30 | 1998-11-18 | Henkel Corporation | Chromate treatment bath composition and process for application to metals |
EP0877832A4 (en) * | 1995-11-30 | 1999-02-24 | Henkel Corp | COMPOSITION OF A CHROMATE TREATMENT BATH AND METHOD OF APPLYING TO METALS |
US6149735A (en) * | 1995-11-30 | 2000-11-21 | Henkel Corporation | Chromate treatment bath composition and process for application to metals |
Also Published As
Publication number | Publication date |
---|---|
US4644029A (en) | 1987-02-17 |
GB2164956B (en) | 1988-05-11 |
NZ213440A (en) | 1988-04-29 |
GB8523573D0 (en) | 1985-10-30 |
AU580333B2 (en) | 1989-01-12 |
GB2164956A (en) | 1986-04-03 |
GB8424159D0 (en) | 1984-10-31 |
BR8504719A (pt) | 1986-07-22 |
JPS6184382A (ja) | 1986-04-28 |
AU4743185A (en) | 1986-04-10 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR IT NL |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Withdrawal date: 19860524 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HIGGINS, GEORGE Inventor name: CABLE, JANE |