oxidation and sulfidationUS4123594 *Sep 22, 1977Oct 31, 1978General Electric CompanyOuter coating of chromium and at least one of the elements iron, cobalt and nickel and an outer portion including aluminum and an element selected from hafnium, platinum, rhodium and palladiumUS4123595 *Sep 22, 1977Oct 31, 1978General Electric CompanyMetallic coated articleUS4137370 *Aug 16, 1977Jan 30, 1979The Uni