Effect of Cerium Sulfate on Acidic Electroless Nickel Deposition
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：刘海萍 李宁 毕四富
文章页码：180 - 184
摘 要：The effect of cerium sulfate on bath stability, deposition rate, reaction activation energy and deposit composition in acidic electroless nickel plating solutions was investigated. The influence mechanism of cerium sulfate on electroless nickel was also studied by electrochemical measurements. The results show that addition of cerium sulfate increases activation energy of electroless nickel reaction and improves bath stability. The effect of cerium sulfate on the deposition rate depends on its concentration. Deposition rate increases with increasing cerium sulfate concentration, and reaches a maximum at 2 mg·L-1. At higher concentration, the deposition rate decreases. X-ray fluorescence spectrometer analysis demonstrates that cerium sulfate has little influence on phosphorus concentration in Ni-P film, and cerium can not co-deposit with Ni and P. Electrochemical modulation shows that adding cerium sulfate to EN solution decreases the steady-state potential of Ni-P electrode and increases the anodic hypophosphite oxidation current. Cerium sulfate has little influence on cathodic reduction of Ni2+.
刘海萍，李宁，毕四富
摘 要：The effect of cerium sulfate on bath stability, deposition rate, reaction activation energy and deposit composition in acidic electroless nickel plating solutions was investigated. The influence mechanism of cerium sulfate on electroless nickel was also studied by electrochemical measurements. The results show that addition of cerium sulfate increases activation energy of electroless nickel reaction and improves bath stability. The effect of cerium sulfate on the deposition rate depends on its concentration. Deposition rate increases with increasing cerium sulfate concentration, and reaches a maximum at 2 mg·L-1. At higher concentration, the deposition rate decreases. X-ray fluorescence spectrometer analysis demonstrates that cerium sulfate has little influence on phosphorus concentration in Ni-P film, and cerium can not co-deposit with Ni and P. Electrochemical modulation shows that adding cerium sulfate to EN solution decreases the steady-state potential of Ni-P electrode and increases the anodic hypophosphite oxidation current. Cerium sulfate has little influence on cathodic reduction of Ni2+.
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