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Method for coating metallic surfaces with a mixture containing at least two silanes

A metal surface, fluorine-containing silane technology, used in metal material coating technology, anti-corrosion coatings, air transportation, etc., can solve problems such as insufficient corrosion resistance of organic films

Inactive Publication Date: 2006-05-24
CHEMETALLGMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] DE-A1-101 49 148 describes an aqueous coating composition based on organic film formers, fine inorganic particles and lubricants and / or organic corrosion inhibitors, which, despite being free of chromium compounds, produces excellent corrosion resistance , adhesion strength and formability results especially in Galvalume  steel, but also shows that in hot-dip galvanized, electro-galvanized, Galfan  - Insufficient corrosion resistance of organic films with a layer thickness of approx.

Method used

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Examples

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Effect test

example and comparative example

[0158] The examples described below are intended to describe the subject-matter of the invention in more detail.

[0159] A) Compositions with higher silane content:

[0160] For the preparation of the aqueous concentrate, an aqueous mixture was prepared according to Table 1, intended for silanes which had not been prehydrolyzed, in said mixture already containing glacial acetic acid and ethanol, at least one silane was dissolved in acidic medium at room temperature and The prehydrolysis was carried out under stirring for at least 3 days, wherein the silane used was not yet in prehydrolyzed form. Subsequently, the silane in prehydrolyzed form is optionally added, the system is vigorously stirred, and the preparation is optionally stored at room temperature. Subsequently, the concentrate is diluted with water and, optionally, pH regulators such as ammonia and / or glacial acetic acid are added in order to obtain a ready-to-use treatment bath. Then, in each case at least 5 cle...

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Abstract

Pre-coating of a metal surface prior to further coating or other treatment uses an aqueous composition wholly or mainly free of chromium (VI) compounds and is such that (a) the composition contains (i) an at least partially hydrolyzable silane and (ii) a metal chelate; and (b) the cleaned, etched or pretreated metal is contacted with the composition and the formed film is dried (and optionally hardened) to a thickness of 0.01-10 mu . Independent claims are also included for (1) the process in which the aqueous composition also contains (iii) an organic film-former comprising a water-soluble or -dispersible (co)polymer of acid number 3-250 and (iv) a long-chain alcohol film-forming aid.; and (2) compositions containing (i) and (ii) at 0.1-10 : 1 ratio and optionally also (iii) and (iv) .

Description

technical field [0001] The present invention relates to a method for coating metal surfaces with an aqueous composition comprising at least one fluorine-free silane and at least one fluorine-containing silane and, optionally, an organic film former and / or other components. The invention also relates to the use of such corresponding aqueous compositions and substrates coated according to the method of the invention. Background technique [0002] The method most commonly employed hitherto as a surface treatment or pretreatment of metals, especially metal strips, prior to coating is based on the application of chromium(VI) compounds together with various additives. Due to the toxicological and ecological risks associated with such methods and also due to the foreseeable legal restrictions on the use of chromate-containing methods, alternatives to these methods have long been sought in all areas of metal surface treatment. [0003] The use of silanes for the production of aqueo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/68C09D5/08C23C22/50C23C22/53C23C22/60C23C22/74C23C22/83
CPCC09D5/08C23C22/50C23C22/53C23C22/60C23C22/68C23C22/74C23C2222/20Y02T50/60
Inventor M·瓦尔特A·舍内C·容K·布朗T·科尔伯格N·克利姆
Owner CHEMETALLGMBH
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