Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1993-09-16
1995-02-28
Silverberg, Sam
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
C23C 2207
Patent
active
053933532
ABSTRACT:
A method is described for preparing a black zinc-nickel alloy surface containing at least about 8% nickel in the alloy. The method of the invention comprises contacting said surfaces with a chromium-free aqueous acidic solution of an inorganic acid. Preferably the inorganic acid is a phosphorus acid selected from phosphoric acid, phosphorous acid, hypophosphorous acid, and mixtures thereof. The aqueous acidic solution can also contain at least one silane. Metal articles having zinc-nickel alloy surfaces containing at least about 8% nickel in the alloy which have been treated in accordance with the method of the invention exhibit the desired blackened surfaces and are characterized by improved corrosion resistance when at least one silane is present in the acidic solution.
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Fields, "The Chemical Coloring of Metals" 1927 pp. 206-209.
McGean-Rohco, Inc.
Silverberg Sam
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