Influence of pH values on electroless Ni-P-SiC plating on AZ91D magnesium alloy
来源期刊:中国有色金属学报(英文版)2010年增刊第2期
论文作者:沟引宁 黄伟九 曾荣昌 朱翊
文章页码:674 - 678
Key words:electroless plating; Ni-P-SiC composite coating; magnesium alloy; corrosion; wear resistance
Abstract: A novel Ni-P-SiC composite coating was prepared by electroless plating in order to improve the corrosion capacity and wear resistance of AZ91D magnesium alloy. The influence of pH values on deposition rates and properties of the coatings was studied. The microstructure and phase structure of the Ni-P-SiC coatings were analyzed by scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The corrosion and wear resistance performances of the coatings were also investigated through electrochemical technique and pin-on-disk tribometer, respectively. The results indicate that the composite coating is composed of Ni, P and SiC. It exhibits an amorphous structure and good adhesion to the substrate. The coatings have higher open circuit potential than that of the substrate. The composite coating obtained at pH value of 5.2 possesses optimal integrated properties, which shows similar corrosion resistance and ascendant wear resistance properties to the substrate.