Patent ID: 6033790
Filing Date: 2000-03-07
Classification: C23C,Y10T

Abstract:
An article having on at least a portion of its surface a protective coating having improved acid resistance comprising:at least one layer comprised of nickel over said surface;layer comprised of zirconium, titanium or zirconium-titanium alloy over said at least one layer comprised of nickel;sandwich layer comprised of plurality of alternating layers comprised of zirconium compound, titanium compound or zirconium-titanium alloy compound and zirconium, titanium or zirconium-titanium alloy over said layer comprised of zirconium, titanium or zirconium-titanium alloy;layer comprised of zirconium compound, titanium compound or zirconium-titanium alloy compound over said sandwich layer; and layer comprised of zirconium oxide, titanium oxide, or zirconium-titanium alloy oxide over said layer comprised of zirconium compound, titanium compound or zirconium-titanium alloy compound.