铜粉粒径对机械镀Cu-Zn镀层性能的影响

发布时间：2018-06-21 13:10

本文选题：机械镀 + Cu-Zn镀层　；参考：《材料保护》2017年09期

【摘要】：为获得更好的防护+装饰双重效果,采用不同粒径(200,400,800,1 000,1 200目)的铜金粉,利用机械镀技术在钢铁基体表面制备了铜-锌复合镀层。采用称重法分析了镀层的致密度,采用贴滤纸法检验了镀层孔隙率,采用划线划格法分析了镀层的结合强度,采用全浸腐蚀法及电化学极化法分析了镀层的耐腐蚀性能。结果表明:不同粒径铜金粉制备的镀层均覆盖完整,随铜粉粒径减小,复合镀层孔隙分布减少;随着铜粉粒径的减小,镀层的致密度逐渐增加,当铜粉粒径为1 000目时,Cu-Zn镀层的致密度已大于金属锌的密度;随着铜粉粒径的减小,镀层的结合强度增加,当铜粉粒径为200目时镀层的结合强度较差,而铜粉粒径小于400目时镀层的结合强度明显提高;随着铜粉粒径的减小,镀层的全浸腐蚀速率逐渐减小,耐腐蚀性增强。
[Abstract]:In order to obtain better double effect of protective decoration, copper and zinc composite coatings were prepared on iron and steel substrates by mechanical plating using copper gold powder with different diameters (200 ~ (400) / 800 ~ (000) ~ (1 000) ~ (1 000) mesh). The density of the coating was analyzed by weighing method, the porosity of the coating was tested by filter paper, the bonding strength of the coating was analyzed by the marking method, and the corrosion resistance of the coating was analyzed by means of full immersion corrosion method and electrochemical polarization method. The results showed that the coating prepared by copper and gold powder with different particle size was completely covered, and the pore distribution of composite coating decreased with the decrease of copper powder particle size, and the density of composite coating increased with the decrease of copper powder particle size. When the particle size of Cu powder is 1 000 mesh, the density of Cu Zn coating is higher than that of Zn, and the bonding strength increases with the decrease of Cu particle diameter, but the bonding strength is poor when Cu particle size is 200 mesh. However, when the particle size of copper powder is less than 400 mesh, the bonding strength of the coating increases obviously, and with the decrease of the particle size of copper powder, the corrosion rate of the coating decreases gradually and the corrosion resistance increases.
【作者单位】：昆明理工大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51561017)
【分类号】：TG174.44

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