采用循环极化和电化学阻抗方法, 研究了不同温度下溶解氧对304不锈钢在海水中腐蚀电化学性能的影响。循环极化结果表明, 在不同温度条件下, 随着溶解氧浓度的增加, 不锈钢自腐蚀电位均略微正移, 点蚀电位在4 ℃低温环境下正移, 15 ℃条件下负移。在4 ℃、7.5 mg/L溶解氧条件下以及15 ℃时3.0 mg/L、7.5 mg/L溶解氧条件下, 304不锈钢点蚀修复性能下降。电化学阻抗表明, 在天然海水浸泡试验时间内, 电化学阻抗谱都呈现单容抗弧, 表现为一个时间常数。钝化膜随着溶解氧的升高稳定性下降。

Cyclic polarization technique and electrochemical impedance spectroscopy(EIS) were used to study the effect of temperature and dissolved oxygen(DO) on the corrosion properties of 304 stainless steel in seawater. The cyclic polarization results showed that the corrosion potential of stainless steel shifted in the positive direction slightly at different temperatures with the increase of dissovled oxygen concentration. The pitting potential became positive at 4 ℃ and negative with the increase of dissolved oxygen at 15 ℃. The pitting corrosion repair performance of 304 sinless steel decreased under the condition of 4 ℃, 7.5 mg/L DO and 15 ℃, 3.0 mg/L, 7.5 mg/L DO. Electrochemical impedance spectroscopy showed that EIS had a single capacitive loop during the experiment. With the increase of dissolved oxygen the stability of passive film decreased.