Corrosion Resistance of Fe-Cr-Mo-(C,B,P) Amorphous Coatings Thermal Sprayed byHVOF and APS Processes

摘要

Two kinds of Fe-16Cr-30Mo-(C,B,P) alloy powders of different composition were thermal sprayed onto mild steelusing HVOF and APS processes. Perfect amorphous coating was formed by HVOF and APS processes in bothpowders. The corrosion potential of the amorphous coatings sprayed by HVOF process was higher and the passivecurrent density was lower than that of the amorphous coatings sprayed by APS process in 1N HCl solution. Thecoatings of perfect amorphous phase were little corroded after one week immersion tests and the corrosion rates ofthe amorphous coatings showed a fairly less value of 0.03 mm/y compared with Inconel 625 plate in 5N HCl solutionat room temperature.