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Non-chrome passivation of steel

a technology of steel and passivation, applied in the direction of rubber coatings, other rubber coatings, coatings, etc., can solve the problems of significant disposal of solid sludge from waste treatment procedures, waste treatment procedures, waste treatment procedures, etc., and achieve the effect of increasing the corrosion resistance and adhesion properties of the metal surfa

Inactive Publication Date: 2006-03-02
CHEMETALL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the high solubility and the strongly oxidizing character of hexavalent chromium ions, conventional chromate conversion processes require extensive waste treatment procedures to control their discharge.
In addition, the disposal of the solid sludge from such waste treatment procedures is a significant problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Treatment Formulations

[0023] One tested treatment candidate formulation “A”, was a latex emulsion including the following components:

1)U Car Latex 6515.8 wt %(65% actives)2)H3PO422.0 wt % 3)Fluotitanic acid 10 wt %4)Pluronic 1010.5 wt %5)Water remainder

[0024] U Car Latex 651 is an acrylic copolymer resin emulsion having a viscosity 20° C., cP (Brookfield, LVT #3, 50 rpm) of 400 and a particle size in microns of 0.45. It is available from the Union Carbide Corporation of Danbury, Conn. Its major constituents are 1) butyl acrylate, methyl methacrylate, methacrylic acid polymers in an amount of <65 wt %; 2) water −35%; 3) glycols, polyethylene, mono [(1,1,3,3-tetramethylbutyl)phenyl] ether in an amount of less than 2%; and 4) ammonia in 0.2 wt %. It is a white liquid.

[0025] Pluronic 101 is a difunctional block copolymer surfactant terminating in primary hydroxy groups and is available from BASF Corporation in Mount Olive, N.J. It is a block copolymer having hydrophobic propylene ox...

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Abstract

Chromate free treatments and compositions for applying a conversion or passivation coating to metal surfaces. Preferred compositions comprise a film forming latex polymer, fluoacid, phosphoric acid, and a polyoxyethylene / oxypropylene block copolymer. The requisite metal surfaces are contacted by the compositions and dried. Rinsing is optional.

Description

FIELD OF INVENTION [0001] The present invention relates to non-chromate coatings for metals. More particularly, the present invention relates to non-chromate coatings for steel surfaces to improve corrosion resistance and adhesion of paints to the surface. The invention provides a dried in place coating which is particularly effective at treating galvanized steel coil strip. BACKGROUND [0002] The purposes of the formation of a chromate conversion coating on the surface of galvanized steel are to provide corrosion resistance, improve adhesion of coatings and for aesthetic reasons. Chromate passivation of a galvanized steel surface is done to provide corrosion resistance and for aesthetic reasons on materials which are not to be painted. The conversion coating improves adhesion of coating layers such as paints, inks, lacquers and plastic coatings. Galvanized steel is typically treated with an aqueous composition containing hexavalent or trivalent chromium ions with other additives to ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C23C22/00
CPCC23C22/83C23C22/361C09D119/02C09D121/02
Inventor KEYS, ANDREAMELZER, JEFFREY I.RAAB, MICHAEL T.
Owner CHEMETALL CORP
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