Preparation and Corrosion Resistance of Amorphous Cr-C Alloy Coating

Amorphous Cr-C alloy coating was prepared by electrodepositing in tartaric acid additive bath. The microstructure, composition and surface morphology of the coating were detected by X-ray diffraction, SEM and EDS, also the microhardness, electrochemical corrosion resistance of the coating were tested. The results showed that a broad diffraction peak appeared on the X-ray diffraction pattern, the coating had a smooth and dense surface without pinhole and crack when the dosage of tartaric acid was 40 g/L. Compared with conventional crystalline Cr coating, amorphous Cr-C alloy coating had better corrosion resistance.