ALUMINA COATING FOR THE PROTECTION OF STAINLESS STEEL

摘要

An alumina coating, produced by aluminium electroplating of astainless steel containing from about 0.02 to about 0.2% of misch metal or 0.2 to0.8% of titanium, improved the oxidation resistance in air of these stainless steelsat least up to 1100°C. In thermal cycling tests carried out between 1000°C androom temperature, these steels maintained an excellent adhesion matrix-coating, forat least up to 500 cycles. In fact, the addition of misch metal or titanium in stainlesssteel provided good bonding between coating and matrix. The porous nature of thealumina coating was found very beneficial because it favors the absorption of thethermal and growth stresses.