摘要
采用氯化物-硫酸盐型无镉、无氰环保型镀液在300M超高强度钢基体上制备了Zn-Ni合金镀层,利用弯曲试验、电镜扫描、能谱分析、中性盐雾试验、X射线衍射和电化学极化方法分别研究了温度和电流密度等工艺参数对Zn-Ni合金镀层的外观和结合力的影响以及镀层镍含量和微观结构与耐蚀性的关系。结果表明,电流密度对Zn-Ni镀层成分的影响明显,未钝化镀层比松孔镀镉层更耐腐蚀;温度45℃镀层Ni含量质量分数为13.5%,最高耐盐雾腐蚀时间达1 632 h。
Zn-Ni alloy coating was prepared on 300M ultra-high strength steel by electroplating in Cd-free and cyanide-free environmentally friendly bath of chloride-sulfate. The effects of plating parameters on the appearance and adhesion strength of the alloy coating, and the relationships among Ni content and microstructure and corrosion resistance of the coatings were investigated using bending test, scanning electron microscopic analysis, energy dispersive spectrometric analysis, neutral-salt-spray test, X-ray diffraction, and electrochemical polarization test. It was found that current density had obvious effect on the composition of the Zn-Ni alloy coating, the unpassivated alloy coating had better anti-corrosion ability than porous electroplated Cd coating. Moreover, the alloy coating containing 13.5% Ni had the highest enduration of 1 632 h to neutral salt spray test, indicating that the Zn-Ni alloy coating has good corrosion resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2008年第6期60-64,共5页
Materials Protection
关键词
电镀
300M超高强度钢
锌镍合金镀层
耐蚀性
electroplating
300M ultra-high strength steel
Zn-Ni alloy coating
corrosion resistance
