Composition and process for the treatment of metal surfaces

A composition, metal technology, applied in the field of compositions and methods for metal surface treatment, capable of solving problems such as inability to provide corrosion resistance and adhesion

Inactive Publication Date: 2008-04-02
MACDERMID INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chromate conversion coatings do not provide good corrosion resistance and adhesion at high temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Metal parts are first cleaned by immersing them in an alkaline cleaning solution at 170°F for 10 to 15 minutes to remove surface contamination. The alkaline cleaning solution used in this example was MacDermid TS 40A at a concentration of 6 oz / gal, although other alkaline cleaning solutions could be used. Next, rinse the parts for approximately 2 minutes. The parts were deoxidized in a 50% nitric acid solution at ambient temperature for approximately 1 minute and then subjected to a second rinse. The part is exposed to the conversion coating of the present invention at a temperature from room temperature to about 125[deg.]F for a period of about 2 to 10 minutes. The parts are then rinsed one last time and dried and / or baked. Finally, the part can be coated or otherwise treated. Table 1 provides several examples of processing bath concentrations that may be used in solutions of the present invention.

[0025] The suitable bath concentration of table 1 solution of the...

Embodiment 2

[0028] By baking sample panels at different temperatures for 10 minutes each, and comparing the results for panels coated with chromate conversion coatings, the effect of heat treatment on neutral salt Influence of results in spray tests. The results are shown in Table 2.

[0029] Table 2 heat treatment for zirconium tungstate coating and chromate coating in

[0030] Comparison of Effects of Results in Neutral Spray Tests

[0031]

[0032] It is readily seen that, at elevated temperatures, panels treated with the composition of the invention provide much greater corrosion protection than similar panels coated with a chromate conversion coating.

Embodiment 3

[0034] Panels treated with zirconium and tungsten solutions were tested side-by-side with panels treated with chromate conversion coatings in accordance with MIL-C-81706 and MIL-C-5541. For comparison, bare aluminum panels were included in the test. The treated (or bare aluminum) panels are sprayed or powder coated with primer and / or paint. The treated (or bare aluminum) panels were then subjected to a 2 mm cross web / tape peel test according to ASTM D 3359-87 Method B (Standard Test Method for Measuring Adhesion Using Tape). Bare aluminum panels produced consistent adhesion failures, as predicted. On the other hand, the panels coated with zirconium tungstate provided an increase in adhesion that equaled or exceeded that of the panels coated with chromate.

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PUM

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Abstract

A method of forming a conversion layer on a metallic surface and a composition usable in the method are provided. The composition is an aqueous solution comprising a source of tungstate ions and a soluble material comprising zirconium. The method provides a conversion coating on a surface that can then be painted or otherwise treated. The conversion coatings of the present invention are minimally affected by heating and / or baking, unlike chromate conversion coatings of the prior art.

Description

field of invention [0001] The present invention relates to a composition and method for producing conversion coatings on metal surfaces. The conversion coatings of the present invention are generally chrome-free and improve the corrosion resistance of the treated surface as well as the adhesion of dry organic varnishes to the treated surface. Additionally, the conversion coatings of the present invention are less affected by subsequent heating and / or baking steps. The invention is particularly suitable for the treatment of zinc, zinc alloys, aluminum and aluminum alloys, although steel and other metals can also be treated. Background technique [0002] In order to protect the metal against corrosion and as a substrate to improve the adhesion of subsequently applied dry organic varnishes, various conversion coatings have been suggested in the prior art for the purpose of forming coatings suitable for metal surfaces. The conversion coating is produced by treating the metal s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/48C23C22/40C23C22/42C23C22/44
CPCC23C22/40C23C22/44
Inventor 杰拉尔德·武伊齐克贾斯廷·吉拉德罗伯特·贝里理查德·鲍尔
Owner MACDERMID INC
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