糖精钠对脉冲电沉积Ni-Sn-Mn合金镀层性能的影响
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摘要
采用脉冲电沉积法在Q235钢表面制备了Ni-Sn-Mn合金镀层,并研究了糖精钠的质量浓度对镀层的成分、沉积速率、表面形貌及耐蚀性的影响。结果表明:随着糖精钠的质量浓度的增加,阴极极化曲线负移,阴极极化作用增强;镀层中Ni和Sn的质量分数降低,而Mn的质量分数升高;沉积速率和阴极电流效率均减小;镀层的耐蚀性先增强后减弱。当糖精钠的质量浓度为3g/L时,制备的Ni-Sn-Mn合金镀层均匀致密,在3.5%的NaCl溶液中具有最正的自腐蚀电位、最低的自腐蚀电流密度和最大的电荷转移电阻,耐蚀性最好。
Ni-Sn-Mn alloy coatings were prepared on the surface of Q235 steel by pulse electrodeposition,and the effect of mass concentration of saccharin sodium on the composition,deposition rate,surface morphology and corrosion resistance of the coatings was investigated.The results showed that with the increasing of mass concentration of saccharin sodium,the cathodic polarization curve moved towards the negative direction,and cathode polarization effect was enhanced.The mass fraction of Ni and Sn decreased,while the mass fraction of Mn increased.The deposition rate and cathode current efficiency were both decreased.Corrosion resistance of the coatings was enhanced firstly and then weakened.The Ni-Sn-Mn alloy coating prepared at mass concentration of saccharin sodium of 3g/L was uniform and compact,and exhibited the best corrosion resistance in 3.5% NaCl solution,it has the most positive selfcorrosion potential,the smallest self-corrosion current density and the biggest charge transfer resistance.
Ni-Sn-Mn alloy coatings were prepared on the surface of Q235 steel by pulse electrodeposition,and the effect of mass concentration of saccharin sodium on the composition,deposition rate,surface morphology and corrosion resistance of the coatings was investigated.The results showed that with the increasing of mass concentration of saccharin sodium,the cathodic polarization curve moved towards the negative direction,and cathode polarization effect was enhanced.The mass fraction of Ni and Sn decreased,while the mass fraction of Mn increased.The deposition rate and cathode current efficiency were both decreased.Corrosion resistance of the coatings was enhanced firstly and then weakened.The Ni-Sn-Mn alloy coating prepared at mass concentration of saccharin sodium of 3g/L was uniform and compact,and exhibited the best corrosion resistance in 3.5% NaCl solution,it has the most positive selfcorrosion potential,the smallest self-corrosion current density and the biggest charge transfer resistance.
引文
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[3]贺雪峰,应华根,严密.光亮化学镀镍-磷合金性能研究[J].电镀与精饰,2006,28(5):4-7.
[4]李俊华,邝代治,冯泳兰,等.有机添加剂作用下锌镍合金电沉积机理[J].化学试剂,2011,33(2):152-156.
[5]李延伟,尚雄,姚金环,等.糖精对柠檬酸盐中性电镀镍影响的研究[J].电镀与精饰,2013,35(9):43-46.
[6] PAVLATOU E A,RAPTAKIS M,SPYRELLIS N.Synergistic effect of 2-butyne-1,4-diol and pulse plating on the structure and properties of nickel nanocrystalline deposits[J].Surface and coatings technology,2007,201(8):4571-4577.
[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] LUO Q,WU Z,QIN Z,et al.Surface modification of nickelaluminum bronze alloy with gradient Ni-Cu solid solution coating via thermal diffusion[J].Surface and coatings technology,2017,309:106-113.