C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/25
C23C 8/06 (2006.01) C23C 8/02 (2006.01) C23C 8/10 (2006.01)
Patent
CA 1240906
OXIDE WHISKER GROWTH ON CONTAMINATED ALUMINUM-CONTAINING STAINLESS STEEL FOIL Abstract of the Disclosure In aluminum-containing stainless steel foil, the presence of magnesium impurity in an amount greater than about 0.002 weight percent has been found to inhibit formation of a preferred oxide surface layer characterized by multitudinous oxide whiskers of a type suitable for tightly bonding an applied coating. A method for purifying magnesium-contaminated foil comprises heating the foil to selectively vaporize the magnesium while avoiding incipient melting of the base alloy, preferably between about 1000°C and 1150°C. The magnesium vapors escape into a suitable ambient phase such as a vacuum or a dry hydrogen gas. Thereafter, the foil is oxidized under conditions effective to produce the desired whiskers. A preferred steel is composed of an iron-base alloy comprising about 15 to 25 weight percent chromium and 3 to 6 weight percent aluminum, and optionally may contain cerium or yttrium in an amount effective to promote oxide adherence.
495559
General Motors Corporation
Gowling Lafleur Henderson Llp
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