Research on properties of amorphous Cr-C alloy coating in crystallization evolution

摘要

Amorphous Cr-C alloy coating was prepared by electrodepositing.The microhardness of the coating was tested after annealing from 100°C to 800°C and the crystallization evolution was studied by the analysis of X-ray diffraction (XRD) and differential scanning caborimetry (DSC).The results showed that the crystallization evolution of the coating began at 300°C and finished around 450°C,and intermetallic compound Cr7C3 and Cr23C6 appeared when heat treatment temperature reached around 600°C.The microhardness,corrosion resistance as well as the adhesion of the coatingall increased first with the temperature and then dropped until it attained the proper values.The microhardness reached the maximum of 1610HV0.025 at 600°C.While the corrosion resistance and the adhesion force attained the peak value at about 400°C.