C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
117/112, 148/47
C22F 1/04 (2006.01) C23C 2/28 (2006.01) C23F 17/00 (2006.01)
Patent
CA 1129264
METHOD OF PRODUCING AN ALUMINUM-ZINC ALLOY COATED FERROUS PRODUCT TO IMPROVE CORROSION RESISTANCE Abstract of the Disclosure This invention relates to an aluminum-zinc alloy coated ferrous base product which exhibits improved atmos- pheric corrosion resistance, and to the process whereby such improved corrosion resistance may be realized. The process is characterized by the steps of heating such coated product to a temperature within the single phase region for the composition corresponding to the aluminum and zinc of said coating, defined as a in the FIGURE in the accompanying drawing, preferably at a temperature between about 650°F (343°C) to 750°F (399°C), for a period of time to solution treat the aluminum-zinc alloy coating overlay, and cooling slowly to at least 350°F (177°C). The resulting product is characterized by improved atmospheric corrosion resistance as a result of the combination of an aluminum-zinc alloy coating overlay having a structure comprised of a fine dispersion of beta-zinc within a matrix of alpha-aluminum, and a thin intermetallic layer interposed between said overlay and said ferrous base. -1-
361857
Allegra Louis K.
Borzillo Angelo R.
Townsend Herbert E.
Bethlehem Steel Corporation
Smart & Biggar
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