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Treatments for chromate-free conversion coatings on metals

A technology for processing compositions and metals, applied in the coating process of metal materials, etc.

Inactive Publication Date: 2011-12-28
凯麦塔尔公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high solubility and strong oxidizing properties of hexavalent chromium ions, conventional chromate conversion processes require bulky waste treatment steps to control their discharge
Furthermore, the disposal of solid sludge from this waste treatment step is a serious problem

Method used

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  • Treatments for chromate-free conversion coatings on metals
  • Treatments for chromate-free conversion coatings on metals
  • Treatments for chromate-free conversion coatings on metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Example 1 - Treatment Formulation

[0077] One tested treatment candidate formulation "A" was a latex emulsion comprising: a) 75 wt% polyamidoamine / epihalohydrin resin - KYMENE 557H - Hercules Inc. - (12.5% ​​active ingredient) b) 11.1 wt% Airflex 4530 Ethylene Vinyl Chloride Emulsion; (approximately 50% active ingredient); and c) balance deionized water. To this base treatment was added the variable levels of phosphoric and fluoroacids shown.

[0078] processing order

[0079] The test panels of the examples were prepared by spraying and rinsing G70 / 70 hot-dip galvanized steel test panels (available from ACT Laboratories) with a 3% aqueous solution of an alkaline surfactant product, followed by rinsing with DI water, followed by the test treatment Formulations were applied by spin coating followed by forced air drying. The treated panels were then painted with a black one-coat polyester paint. The painted panels were oven dried at 650°F, reaching a peak metal tempe...

Embodiment 2

[0095] Formulation "A" of Example 1 was modified by replacing Union Carbide's Neocar 2535 vinyl / acrylate as the latex component. The resulting test formulation is referred to below as "B".

[0096] The formulation and effect results (table 3) of various treatments are as follows:

[0097]

[0098] table 3.

[0099]

[0100] *NSS results are grades of scribe / field, 10=best

[0101] The results in Table 2 demonstrate comparable results with the chrome-free rinse.

Embodiment 3

[0103] Another new chromium-free pre-treatment described below has the following formulation concentrations and is available at

[0104]

[0105]

[0106] The formulations and effects (Tables 4 and 5) are as follows:

[0107] Table 4 Physical Test Data

[0108]

[0109] Table 5 Neutral salt spray test data, according to ASTM D1654 identification board grade (10 = best)

[0110]

[0111] The data in Table 5 demonstrate comparable results to the chromium-free treatment (Sample 16).

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Abstract

Chromate-free treatments and compositions for applying conversion or passivation coatings to zinc-coated metal surfaces. The composition comprises a polyamidoamine / epihalohydrin polymer or a cationic polyamine / epihalohydrin polymer component, a fluoroacid, H3PO4 and a film-forming latex polymer component. The desired metal surface is contacted with the composition and dried. Rinsing is optionally performed.

Description

[0001] This application is the application number of 200480012289.3 (PCT / US2004 / 010644), the application date is April 7, 2004, and the title is "the treatment of the conversion coating for metal without chromate". Divisional application. [0002] Cross References to Related Applications [0003] This application is a continuation-in-part of U.S. Patent Application 10 / 430,579 filed May 6, 2003, which itself is a continuation-in-part of U.S. Patent Application 10 / 341,164 filed January 13, 2003, which 10 / 341,164 The application itself is a divisional application of US Patent Application Serial No. 09 / 613,529, filed July 8, 1999, which itself is a continuation-in-part of US Patent Application Serial No. 09 / 348,346, filed July 8, 1999. The disclosures of all above-mentioned applications in the field are hereby incorporated by reference. technical field [0004] The present invention relates to chromate-free coatings for metals. More specifically, the present invention relates t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/36C09D179/02
Inventor 杰弗里.I.梅尔泽安德烈亚.基斯迈克尔.T.拉布罗伯特.A.格尔曼
Owner 凯麦塔尔公司