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采用恒电位极化、动电位极化、EIS和三维视频显微技术研究温度对304不锈钢在3.5%(质量分数)NaCl水溶液中点蚀行为和腐蚀形貌的影响。结果表明:随着温度由20℃升高至40℃,亚稳蚀孔萌生期变短,单位时间形核数目增多,平均峰值电流和平均峰值宽度增大,亚稳蚀孔数目增加导致稳态蚀孔出现几率增加。经0.15 V(vs SCE)恒电位极化后,单个蚀孔的点蚀电流、蚀孔体积、蚀孔口径和孔深的增长速率均随温度的升高而增加;同一温度下蚀孔口径和孔深的增长速率随时间的延长略微减缓。蚀孔表面具有不完整的花边盖,盖板完整程度随温度升高而降低。
The effects of temperature on the pitting corrosion behavior and corrosion morphology of 304 stainless steel in 3.5% NaCl aqueous solution were studied by potentiostatic polarization, potentiodynamic polarization, EIS and 3D video microscopy. The results showed that as the temperature increased from 20 ℃ to 40 ℃, the initiation period of metastable pores became shorter, the number of nucleation per unit time increased, the average peak current and the average peak width increased, and the number of metastable pores increased, leading to steady state Pits appear to increase the probability. After 0.15 V (vs SCE) potentiostatic polarization, the growth rate of pitting current, pore volume, pore size and pore depth of a single pits increased with the increase of temperature; at the same temperature, The hole’s growth rate slowed down slightly over time. The surface of the etched hole has an incomplete lace cover, and the integrity of the cover decreases with increasing temperature.