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US 3,963,530 AGranted
Stainless steels coated with black oxides
AssigneeCoral Chemical Company
InventorsThomas J. Smollett, Bozidar Stipanovic
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Abstract
A firmly adherent black oxide coating for chromium-containing martensitic and ferritic stainless steel substrates, particularly windshield wiper blade assemblies, consisting essentially of (Fe,Cr).sub.2 O.sub.3 and Fe.sub.3 O.sub.4.
Claims6
A chromium-containing martensitic or ferritic stainless steel substrate coated with a firmly adherent compact and smooth black oxide coating consisting essentially of a substantial amount of sodium and (Fe,Cr).sub.2 O.sub.3 and Fe.sub.3 O.sub.4 of a thickness from about 1.5 to about 4.5 microns.
Dependencies are inferred from the claim text.