复合光亮剂对脉冲电镀Zn-Ni-Mn合金镀层性能的影响
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摘要
采用脉冲电镀法在Q235钢表面制备了Zn-Ni-Mn合金镀层。采用辉光放电光谱仪、扫描电镜、Tafel曲线和电化学阻抗谱,考察了复合光亮剂的体积分数对镀层的成分、沉积速率、表面形貌和耐蚀性的影响。结果表明:添加复合光亮剂能细化镀层表面晶粒,提高镀层的致密度和光泽度。随着复合光亮剂体积分数的增大,镀层中Zn和Ni的质量分数降低,Mn的质量分数升高;镀层的沉积速率先增大后减小;镀层的耐蚀性先提高后降低。当复合光亮剂的体积分数为10mL/L时,镀层具有最正的自腐蚀电位、最小的自腐蚀电流密度和最大的电荷转移电阻,耐蚀性最好。
Zn-Ni-Mn alloy coatings were prepared on the surface of Q235 steel by pulse electroplating.The effect of the volume fraction of composite brightener on the composition,electrodeposition rate,surface morphology and corrosion resistance was investigated by glow discharge spectroscopy,scanning electron microscopy,Tafel curve and electrochemical impedance spectroscopy.Results show that the composite brightener can refine the grains,and increase the density and glossiness of the coating.With the increasing of the volume fraction of composite brightener,the mass fraction of Zn and Ni in the coating were decreased,while the mass fraction of Mn was increased.The electrodeposition rate was increased firstly and then decreased,and the corrosion resistance of the coating become better firstly and then worse.The coating prepared with 10 mL/L composite brightener has the highest self-corrosion potential,the lowest selfcorrosion current density and the highest charge transfer resistance,exhibiting the best corrosion resistance.
Zn-Ni-Mn alloy coatings were prepared on the surface of Q235 steel by pulse electroplating.The effect of the volume fraction of composite brightener on the composition,electrodeposition rate,surface morphology and corrosion resistance was investigated by glow discharge spectroscopy,scanning electron microscopy,Tafel curve and electrochemical impedance spectroscopy.Results show that the composite brightener can refine the grains,and increase the density and glossiness of the coating.With the increasing of the volume fraction of composite brightener,the mass fraction of Zn and Ni in the coating were decreased,while the mass fraction of Mn was increased.The electrodeposition rate was increased firstly and then decreased,and the corrosion resistance of the coating become better firstly and then worse.The coating prepared with 10 mL/L composite brightener has the highest self-corrosion potential,the lowest selfcorrosion current density and the highest charge transfer resistance,exhibiting the best corrosion resistance.
引文
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[9]许肖丽,韩伟,孙克,等.工艺因素对氨基磺酸盐镀铟阴极电流效率的影响[J].金属功能材料,2007,14(4):19-22.
[10]刘海鹏,张志桐,王心悦,等.尿素含量对脉冲电镀Ni-Cr-Mo合金镀层的影响[J].铸造技术,2017,38(1):84-87.
[11]宋贵宏,娄茁,李锋,等.电弧离子镀方法制备的Ti/TiN多层膜的结构与耐腐蚀性能[J].中国有色金属学报,2012,22(2):509-514.
[2]戴长松,王殿龙,袁国辉,等.光亮剂对化学镀镍层性能及结构的影响[J].稀有金属材料工程,2006,35(4):651-654.
[3]DOI T,MIZUMOTO K,TANAK S,et al.Bright nickel plating from nickel citrate electroplating baths[J].Metal finishing,2004,102(4):26-35.
[4]ZHANG W,XUE Q,ZHANG X.Influence of brighteners on the friction and wear of electrodeposited multilayer films[J].Wear,1998,214(1):74-78.
[5]孙武,李宁,黎德育.光亮剂在碱性镀锌液中的阴极行为[J].电镀与精饰,2006,28(5):12-14.
[6]严钦元.现代电镀与表面精饰添加剂[M].北京:科学技术文献出版社,1994.
[7]王心悦,杨海丽,刘海鹏,等.pH对脉冲电镀锌-镍-锰合金的影响[J].电镀与涂饰,2016,35(9):449-453.
[8]纪丹,勒霞文,钟庆东,等.酸性环境中pH对低碳钢表面NiMn合金沉积层的影响[J].腐蚀与防护,2014,35(12):1217-1220.
[9]许肖丽,韩伟,孙克,等.工艺因素对氨基磺酸盐镀铟阴极电流效率的影响[J].金属功能材料,2007,14(4):19-22.
[10]刘海鹏,张志桐,王心悦,等.尿素含量对脉冲电镀Ni-Cr-Mo合金镀层的影响[J].铸造技术,2017,38(1):84-87.
[11]宋贵宏,娄茁,李锋,等.电弧离子镀方法制备的Ti/TiN多层膜的结构与耐腐蚀性能[J].中国有色金属学报,2012,22(2):509-514.