采用动电位极化和电化学阻抗谱研究了温度对316L不锈钢在硼酸溶液中的腐蚀电化学行为的影响, 并通过Mott-Schottky曲线考察了不同温度下钝化膜的半导体性质。结果表明, 316L不锈钢在35~85 ℃均能形成稳定的钝化膜。温度的升高并没有改变腐蚀机理, 但温度的升高促进了腐蚀反应的阳极过程, 加快了腐蚀速率。随着温度的升高电荷转移电阻下降。Mott-Schottky曲线结果表明, 温度对于316L不锈钢钝化膜的半导体本征性质没有根本影响, 在-0.3~0.3 V(SCE)电位区间内钝化膜呈n型半导体特征; 在0.3~1.5 V(SCE)电位区间内钝化膜呈p型半导体特征。施主密度与受主密度随着温度的升高而增大。

The effects of temperture on the electrochemical corrosion behaviors of 316L stainless steel in borate buffer solution were investigated by dynamic polarization and electrochemical impedance spectroscopy (EIS). Mott-Schottky curves were used to study the semiconductor characters of the passive film .The results showed that a stable passive film formed on 316L stainless steel surface in the range from 35 ℃ to 85 ℃. It was found that corrosion mechanism was not changed with the increase of solution temperature, but the anodic process was promoted and the corrosion rate increased. The polarization resistance decreased with the solution temperature increase. The result of Mott-Schottky curves showed that there was little effect of temperature on the semiconductor characters of passive film. The passive film was a n-type semiconductor in the range of -0.3 V to 0.3 V (SCE) and it was p-type semiconductor in the 0.3 V to 1.5 V (SCE). The donor density (NS) and acceptor density (ND) increased with increasing the temperature.