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Passivation composition and process for zinciferous and aluminiferous surfaces

a technology of aluminiferous and zinciferous surfaces, applied in the direction of solid-state diffusion coating, metal-based coating process, coating, etc., can solve the problems of surface staining and white corrosion, and achieve the effect of adequate corrosion resistan

Inactive Publication Date: 2005-04-07
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In at least one aspect of the invention, an entirely or substantially chromium-free composition and process for passivating is provided that provides adequate corrosion resistance in comparison with previously used chromate containing passivating agents.

Problems solved by technology

While the underlying steel is protected, the zinc coating is sometimes susceptible to corrosion that can result in surface staining and white corrosion.
However, the adverse environmental effects of hexavalent chromium that have come to public attention in recent years have resulted in development of alternative, chromium-free compositions for this purpose.

Method used

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  • Passivation composition and process for zinciferous and aluminiferous surfaces
  • Passivation composition and process for zinciferous and aluminiferous surfaces

Examples

Experimental program
Comparison scheme
Effect test

example 1

Working compositions 1 and 2 were prepared as set forth below in Table 1.

TABLE 1Passivate CompositionsComposition 1Composition 2(pH ˜1.7)(pH ˜1.7)Ingredientwt. (g)wt. (g)DI Water92.577.575% H3PO43.54.050% H2TiF64.03.5TD-1355-DE—15.0(10% solids)

Test panels of HDG (hot dipped galvanized) steel and Galvalume® steel were prepared in the following manner.

The HDG steel panels were cleaned with a 3 wt. % solution of Parco® Cleaner 1200, available from Henkel Corporation, at a temperature of about 140° F. for about 20 seconds. The panels were then hot water rinsed at a temperature of about 120° F. for about 10 seconds. The panels were then squeegeed dry. Compositions 1 and 2 were then diluted to about 66 wt. % and were then applied to the panels using a No. 3 draw bar. The panels were then dried in an IR oven. The total coating weight on the panels were about 4-8 mg / ft2.

Galvalume® steel panels were cleaned and treated in the same manner except they were only cleaned for about 7 seco...

example 2

Working compositions 3 and 4 were prepared as set forth below in Table 4.

TABLE 4Passivate CompositionsComposition 3Composition 4(pH ˜1.7)(pH ˜1.7)Ingredientwt. (g)wt. (g)DI Water945.090.575% H3PO425.04.050% H2TiF630.03.5TD-1355-DE—2.0(10% solids)

HDG and Galvalume® steel test panels were prepared and subjected to NSS testing for 336 hours in the manner set forth above in Example 1. The results are shown below in Table 5.

TABLE 5NEUTRAL SALT SPRAY TESTING RESULTS ON GALVALUME AND HDG:% WHITE RUSTDayDayDayDayDayDayDayDay123456714Panel#CompositionSubstrateApplicationAppearance24487296120144168336133Galvalume ®#3 dbSplotchy1133103333100144-6 mg / ft21131033333310015Coating wt.001310333350163Galvalume ®coaterPerfect3100100100100100100100172-4 mg / ft2310010010010010010010018Coating wt.3100100100100100100100284Galvalume ®#3 dbPerfect0000000.11294-8 mg / ft200000.10.10.1130Coating wt.0000000.131101Galvalume ®#3 dbPerfect000135101001114-8 mg / ft200115510100112Coating wt.Dark01155531001132Galva...

example 3

HDG and Galvalume® steel test panels were cleaned with a 4 wt. % solution of Ridoline® 321 at a temperature of about 140° F. for about 30 seconds. The panels were then hot water rinsed at a temperature of about 120° F. for about 10 seconds. The panels were then squeegeed dry. Composition 1 was applied to the panels using various drawbars. The test panels were then subjected to (i) Stack testing, (ii) Butler Water Immersion testing, and (iii) NSS testing for 72 hours in the manner set forth above in Example 1. The results are shown below in Tables 6, 7, and 8.

TABLE 6Stack Test Results(% Black Rust (BR) White Rust (WR))Substrate / Total Coat.CoatingWt.168 Hrs336 Hrs672 Hrsmethod(mg / ft2)BRWRBRWRBRWRHDG8-1200110333(#9 drawbar)Galvalume4-8 001 13 1(#3 drawbar)

TABLE 7Butler Water Immersion Test Results(% Black Rust (BR) White Rust (WR))Substrate / Total Coat.CoatingWt.168 Hrs336 Hrs672 Hrsmethod(mg / ft2)BRWRBRWRBRWRHDG8-12111033333(#9 drawbar)Galvalume4-8 11 3333 3(#3 drawbar)

TABLE 8Neutral...

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Abstract

In at least one embodiment, the present invention relates to a process for the temporary anti-corrosive treatment of a metal surface that consist predominantly of aluminum and / or zinc, said process comprising a) placing the surface of the metal in contact with an anti-corrosive composition comprising 2.0-400 g / L phosphate ions, 0.5-400 g / L fluorometallate ions, and having a pH of between 1.0-4.0, for a time period of between 0.1-200 seconds, b) drying the anti-corrosive treatment composition on the metal surface to form a primary passivating coating on the metal surface, c) removing the primary passivating coating from the metal surface, and d) conversion coating the metal surface. In certain embodiments, the phosphate solution comprises phosphoric acid and the fluorometallate solution comprises hexafluorotitanic acid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention In at least one aspect, the present invention relates to compositions and processes for passivating, i.e., forming a corrosion protective surface layer, on metal surfaces that consist predominantly of aluminum and / or zinc. A wide variety of such surfaces are in normal use, including many kinds of galvanized and / or aluminized steel, and the invention is applicable to such surfaces which differ from the underlying metal, as well as to solid alloys of aluminum and / or zinc. 2. Background Art Zinc (zinciferous) and zinc alloy (such as aluminiferous) coatings are frequently used to protect steel from corrosion. Two common types of metal-coated steel typically used are galvanized steel (zinc) and Galvalume® (55% Al, 43.5% Zn, 1.5% Si). Both galvanized steel and Galvalume® have long service lifetimes as a result of galvanic and / or sacrificial corrosion protection afforded by the coatings. While the underlying steel is protected, the ...

Claims

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Application Information

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IPC IPC(8): C23C22/36C23C22/73
CPCC23C22/73C23C22/361
Inventor SOHI, JASDEEPKELLY, TIMM L.MEAGHER, KEVIN K.
Owner HENKEL KGAA
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