Claims
- 1. An article of manufacture for utilization in an environment having present therein corrosion-inducing substances, which comprises a substrate having a metal-bearing surface of steel or iron, and a plurality of superimposed, discrete, zinc-containing layers sequentially deposited upon said metal bearing surface, the initial discrete layer in contact with said metal bearing surface, having a thickness of at least 0.05 mils and consisting essentially of zinc and from about 4.0% to 14.0% of nickel as an alloying element and a second, discrete layer deposited upon said initial layer, said second layer having a thickness of at least 0.05 mils and consisting essentially of zinc with a lower content of said nickel alloying element, ranging from 0 to about 4.0%, as compared with said initial layer.
- 2. An article of manufacture as claimed in claim 1 in which the second, discrete layer contains a chromate salt passive film.
- 3. An article of manufacture as claimed in claim 1 in which both the initial and second layers are electrodeposited coatings.
RELATED CASES
This application is a continuation-in-part of Application Ser. No. 758,982 filed Jan. 13, 1977, now abandoned.
US Referenced Citations (10)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
758982 |
Jan 1977 |
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