Method of producing an aluminum-zinc alloy coated ferrous produc

Details Method of producing an aluminum-zinc alloy coated ferrous produc Method of producing an aluminum-zinc alloy coated ferrous produc

1979-11-08

1981-09-01

Skiff, Peter K.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 115Q, 148134, 4273839, 427433, C22F 104, C23F 1700

Patent

active

042870097

ABSTRACT:
This invention relates to an aluminum-zinc alloy coated ferrous base product which exhibits improved atmospheric 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 .alpha. in the FIGURE in the accompanying drawing, preferably at a temperature between about 650.degree. F. (343.degree. C.) to 750.degree. F. (399.degree. C.), for a period of time to solution treat the aluminum-zinc alloy coating overlay, and cooling slowly to at least 350.degree. F. (177.degree. 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.

REFERENCES:
patent: 3297499 (1967-01-01), Mayhew
patent: 3325282 (1967-06-01), Mayer et al.
patent: 3782909 (1974-01-01), Cleary et al.
patent: 3860438 (1975-01-01), Shoemaker
patent: 3884729 (1975-05-01), Jackson et al.
patent: 3952120 (1976-04-01), Horton et al.
patent: 4036600 (1977-07-01), Kimura et al.

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