利用动电位极化曲线、电化学阻抗谱和电流-时间响应曲线对690合金在NaCl溶液中的电化学行为进行了研究。结果表明，690合金在不同浓度的NaCl溶液中均表现出阳极钝化现象，腐蚀速率随NaCl浓度的升高而增加。钝化后690合金的耐蚀性提高，在1%NaCl溶液中生成的钝化膜较致密。钝化时间小于1096 s时690合金在0.1%NaCl中的腐蚀电流密度低于其在1%NaCl中的腐蚀电流密度，当钝化时间大于1096 s时690合金在0.1%NaCl中的腐蚀电流密度反而高于其在1%NaCl中的腐蚀电流密度。
The electrochemical behavior of alloy 690 in NaCl were investigated by means of potentiodynamic polarization curves, electrochemical impendence spectrum and current-time transient curves. Alloy 690 exhibited anodic passivation behavior in tested solution. The corrosion rate of alloy 690 increased with the increase of NaCl concentration in tested solution. The passive film of alloy 690 formed in 1% NaCl was relatively compact compared with that in 0.1% NaCl at applied potential of 0.2 V. The corrosion current density of alloy 690 in 1% NaCl (Ip1) was higher than that in 0.1% NaCl (Ip2) when passivation periods less than 1096 s. The value of I p1 was lower than Ip2 when passivation periods longer than 1096 s.
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