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球墨铸铁电刷镀快速铁镀层的显微组织及硬度
王辉, 陈晓龙, 童涵, 张荣荣, 肖圣亮
常州大学 机械工程与轨道交通学院, 江苏 常州213164
摘要:
为提高球墨铸铁表面的显微硬度,设计了以刷镀电压、镀液温度、打底层种类及主盐浓度为主要因素的电刷镀快速铁正交试验,分析了各影响因素对快速铁镀层显微硬度的影响。使用扫描电子显微镜(SEM)、划痕仪、显微硬度仪及摩擦磨损试验机分别表征分析了快速铁镀层的表面形貌、结合强度、显微硬度及耐磨性。结果表明:试验范围内的最优参数为刷镀电压6 V,镀液温度35 ℃、快速镍打底、主盐浓度400 g/L,且在此条件下获得的快速铁镀层表面光滑、平整,晶粒细小,镀层的结合强度为30.07 N,显微硬度是球墨铸铁的4倍多,快速铁镀层的平均摩擦因数为0.35。
关键词:  球墨铸铁  电刷镀  快速铁  正交试验
DOI:10.11933/j.issn.1007-9289.2014.06.016
分类号:
基金项目:
Microstructure and Hardness of Fast Iron Coating on Nodular Cast Iron Prepared by Brush Plating
WANG Hui, CHEN Xiaolong, TONG Han, ZHANG Rongrong, XIAO Shengliang
College of Mechanical Engineering and Rail Transportation, ChangZhou University, Changzhou 213164, Jiangsu
Abstract:
To improve the surface microhardness of nodular cast iron, an orthogonal experiment was designed. The affecting factors of the experiment include brush plating voltage, plating temperature, species of transition layer as well as concentration of main salts. The influences of the affecting factors on the microhardness of fast iron plating layer was analyzed. The surface morphology, bonding strength, microhardness and abrasion resistance of the fast iron plating layer were characterized by scanning electronic microscopy (SEM), scratch tester, microhardness tester, and friction and wear testing machine, respectively. The experiment results show that the preferred parameters are as followings: the brush plating voltage is 6 V, plating temperature is 35 ℃, the substrate is treated by fast nickel, and the main salt concentration is 400 g/L. Under these parameters, the fast iron plating coating surface is smooth and flat, and the crystalline grain is tiny. The bonding strength of the plating layer is 30.07 N, the microhardness of the fast iron plating coating is 4 times that of the nodular cast iron substrate, and the average friction coefficient is 0.35.
Key words:  nodular cast iron  brush plating  fast iron  orthogonal experiment