Composition and process for treating metal

Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...

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148251, 148264, 148275, 427435, C23C 2248

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active

053564901

ABSTRACT:
Heating an aqueous mixture of a fluoroacid such as H.sub.2 TiF.sub.6 and an oxide, hydroxide, and/or carbonate such as silica produces a clear mixture with long term stability against settling of any solid phase, even when the oxide, hydroxide, or carbonate phase before heating was a dispersed solid with sufficiently large particles to scatter light and make the mixture before heating cloudy. The clear mixture produced by heating can either be mixed with water soluble and/or water dispersible polymers, for example with dispersed polymers of the diglycidyl ether of bisphenol-A or an acrylic acid polymer, or with soluble hexavalent and/or trivalent chromium, to produce a composition that improves the corrosion resistance of metals treated with the composition, especially after subsequent painting.

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patent: 5089064 (1992-02-01), Reghi
S. M. Thomsen, "High-Silica Fluosilic Acids: Specific Reactions and the Equilibrium with Silica:", Jour. Amer. Chem. Soc. 74; 1690-93 (1952).

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