喷射电沉积电流密度对Ni/Co多层膜性能影响研究

Study on the Influence of Current Density of Jet Electrodeposition Method for Ni/Co Multilayers

金属多层膜因具有较高的硬度与良好的耐腐蚀性,有望成为性能更为优越的保护性镀层材料。采用喷射电沉积技术在304不锈钢基体上制备了不同电流密度下的Ni/Co多层膜,分别对其微观结构、显微硬度和耐腐蚀性能等方面展开了研究。结果表明:在较高电流密度下的喷射电沉积中,多层膜内主要存在面心立方结构和密排六方结构的晶体,且随着电流密度升高,Ni/Co多层膜表面微观形貌逐渐均匀完整,晶粒逐渐细化。当电沉积电流密度为80 A/dm2时,Ni/Co多层膜的自腐蚀电流密度为5.428×10-7 A/cm2,显微硬度为525.4HV,显示出优异的机械性能与抗腐蚀性能。

Metal multilayer films are expected to become more superior protective coating materials due to their high hardness and good corrosion resistance.In this article,Ni/Co multilayer films with different current density were prepared on 304 stainless steel substrate using jet electrodeposition method,and the microstructure,microhardness and corrosion resistance of the films were studied,respectively.The result showed that in jet electrodeposition at high current density,the multilayers are mainly composed of face-centered cubic and close-packed hexagonal crystals in the multilayer film at high current density when jet electrodeposition.With the increase of current density,the microcosmic surface morphology of Ni/Co multilayer film gradually becomes uniform and complete,and the grains gradually refine.When the current density of electrodeposition is 80 A/dm2,the self-corrosion current density and microhardness of Ni/Co multilayer film is 5.428×10-7 A/cm2 and 525.4HV,demonstrating excellent mechanical properties and corrosion resistance.