Multi-layer corrosion resistant coating for fasteners and method

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

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205176, 205177, 411902, 427406, 428658, 428667, 428674, 428675, 428679, 428935, B32B 1518, C25D 510

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active

052758923

ABSTRACT:
A corrosion resistant coating and process comprises the following layers applied in sequence over a ferrous metal substrate: a micro-throwing nickel-zinc alloy plating; a zinc-nickel alloy plating containing 5 to 30 weight percent nickel; a galvanically protective zinc metal plating; and either copper, nickel and chromium (or chromium substitute) plating layers or a chromate conversion layer. The coating is preferably used with a steel fastener such as a bolt or drill screw in combination with a washer.

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