Abstract: The effect of temperature on corrosion behavior of 316L stainless steel (316L SS) in 3.5% NaCl solution was studied by potentiodynamic polarization and electrochemical impedance，the semiconductor properties of the passivated film were analyzed by Mott⁃Schottky curve. The surface morphology of 316L SS after corrosion was observed by metallographic microscope.The results show that in the NaCl solution with a mass fraction of 3.5%, the open circuit potential and corrosion potential of 316L SS gradually decrease with the gradual increase of temperature, and the self⁃corrosion current density increases gradually.And the pitting potential is also gradually reduced. The results of surface corrosion morphology observation showed that the number and diameter of corrosion pits on the surface of 316L SS increased as the temperature increased.This is mainly because the temperature decreased the density of the passivation film and increased the dissolution rate of the passivation film, and decreases the corrosion resistance.

Key words: 316L stainless steel, Temperature, 3.5%NaCl, Pitting corrosion

摘要： 　采用动电位极化和电化学阻抗等方法，研究了在质量分数为3.5%的NaCl溶液中温度对316L不锈钢（316L SS）腐蚀行为的影响，采用Mott⁃Schottky曲线对钝化膜的半导体性质进行了分析，通过金相显微镜观察了316L SS腐蚀后的表面形貌。结果表明，在质量分数为3.5%的NaCl溶液中，随着温度的逐渐升高，316L SS在该溶液中的开路电位和腐蚀电位逐渐变负，自腐蚀电流密度逐渐增大，钝化膜电阻和点蚀电位也逐渐减小。对表面腐蚀形貌进行观察的结果表明，随着温度的升高，316L SS表面腐蚀坑直径逐渐增大，数量逐渐增多。这主要因为温度的升高降低了316L SS表面钝化膜的致密度，增大了表面钝化膜的溶解速度，使其抗腐蚀性能下降。

关键词: 316L不锈钢, 温度, 3.5%NaCl, 点蚀