Diffusion coating of magnesium in metal substrates

摘要

A protective sacrificial coating is provided for metal substrates, e.g. ferrous metal substrates, such as compressor discs or blades for jet engines, the sacrificial coating comprising an intermetallic compound of magnesium with a coating metal, the coating being anodic to the substrate metal, the coating being optionally covered with an adherent non-metallic overcoat of, for example, a conversion coating.