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用一种新的擦伤电极装置来研究化学镀Ni-P合金在3.5％NaCl溶液中的再钝化行为。结果表明,Ni-P合金的再钝化动力学服从i(t)=A_1exp(-C_1t)+A_2exp(-C_2t)方程。在低电位区,Ni迅速氧化,并在表面形成稳定的氧化物NiOOH。氧化膜的生长服从高场离子传导机制;在高电位区,吸附过程迅速发生,界面上的单分子吸附膜使裸体表面电流很快衰减,吸附的H_2PO_2-有效地阻止了Ni位上的溶解。
A new scratch electrode device was used to study the reactivation behavior of electroless Ni-P alloy in 3.5% NaCl solution. The results show that the passivation kinetics of Ni-P alloy obeys i (t) = A_1exp (-C_1t) + A_2exp (-C_2t) equation. In the low potential region, Ni rapidly oxidized and formed a stable oxide NiOOH on the surface. The growth of oxide film obeys the mechanism of field ion conduction. In the high potential region, the adsorption process occurs rapidly. The monomolecular adsorption film on the interface attenuates the nude surface current rapidly. The adsorbed H 2 PO 2 - effectively prevents the dissolution of Ni.