Multiple zinc-containing coatings
First Claim
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.
4 Assignments
0 Petitions
Accused Products
Abstract
Markedly superior corrosion protective properties are imparted to metal-bearing surfaces at substantially reduced costs by depositing upon said surfaces one or more superimposed coatings containing zinc alloying elements located intermediate the metal-bearing surfaces and a sacrificial layer of generally pure zinc. In this manner penetration of rust inducing substances into the metal bearing surfaces is effectively precluded under substantially all environmental conditions normally encountered.
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Citations
3 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.
Specification