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本文对化学镀Ni-P合金在3.5%NaCl溶液中的阳极行为进行了研究。运用动电位极化技术和电化学阻抗谱(EIS)技术对活化区和钝化区的测量结果表明:过电位与呈线性关系,但不同电位区,其斜率相差较大。在活化区,界面电容C随过电位的增大而减小,而在钝化区,C维持恒定。对表面膜的XPS分析证实:在活化区形成有磷酸盐膜,保护性差,不能有效地抑制溶解过程;而当表面吸附有H2PO2阴离子时,合金进入化学致钝的钝化区.
In this paper, the anodic behavior of electroless Ni-P alloy in 3.5% NaCl solution was studied. The results of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) showed that the over-potential and the over-potential were in linear relationship, but the potentials of different potentials were different greatly. In the activation zone, the interfacial capacitance C decreases with increasing overpotential, while in the passivation zone C remains constant. The XPS analysis of the surface film confirmed that the formation of a phosphate film in the activation zone was poorly protective and could not effectively inhibit the dissolution process. However, when the H2PO2 anion was adsorbed on the surface, the alloy entered the passivation zone which was chemically blunted.