电沉积Ni-W及Ni-W-SiC镀层的组织与性能

Microstructure and properties of Ni-W and Ni-W-SiC alloy coatings deposited by electroplating

采用电沉积法在钢基体表面制备了Ni-W和Ni-W-SiC镀层,并对镀层的成分及组织结构、维氏硬度、与基体的结合力、耐磨性和耐蚀性进行了测试与分析。结果表明,镀层在镀态为非晶结构,在500℃热处理2 h会发生明显晶化,Ni-W和Ni-W-SiC镀层的维氏硬度分别高达1036 HV和1136 HV,硬度和耐磨性均明显高于Cr镀层。经过中性盐雾试验,镀层表现出良好的耐蚀性,保护评级可达到10级。

Ni-W and Ni-W-SiC alloy platings were prepared on steel substrate by alloy electrodeposition method.The chemical compositions,microstructure,vickers hardness,bonding strength,wear resistance and corrosion resistance of the coatings were tested and analyzed.The results show that the coatings as received are noncrystal,but most would crystallize after heat treatment at 500℃for 2 h.The vickers hardness of Ni-W and Ni-W-SiC coatings can up to 1036 HV and 1136 HV,respectively.The vickers hardness and wear resistance of Ni-W and Ni-W-SiC coatings are obviously better than that of Cr coating.By neutral salt spray tests,the coatings shows good corrosion resistance.Their protection rating can be level 10.