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Microstructure and Corrosion Behaviour of Laser-Clad Double-Ceramic-Layer Composite Coating

A double-layer composite coating on Q235 steel substrate was prepared using a new developed in situ technology consisting of SHS reaction, laser cladding and metal dusting techniques. A double-layer composite coating consists of the TiO2–TiC ceramic outer layer and the TiC-CNTs cermet inner layer. An excellent bonding was observed among the outer layer, the inner layer and the steel substrate. Corrosion behavior of the coating was investigated and the commercial 304SS was used for comparison. The outer layer exhibited the highest corrosion resistance and 304SS the lowest corrosion resistance, whereas the inner coating exhibited the intermediate corrosion resistance. However, the severe pitting corrosion which was observed in 304SS did not exist for the coating.