通过电化学动电位再活化法评价了304不锈钢在600℃保温不同时间后的敏化度，研究了不同敏化度试验钢分别在体积分数4%乙酸溶液、质量分数5% NaCl溶液以及二者体积比1：1的NaCl/乙酸混合溶液中的电化学腐蚀行为，以及浸泡时间、溶液温度对电化学腐蚀性能的影响。结果表明：随着保温时间的延长，试验钢的再活化电流增大，敏化度增大；随着敏化度的增大，试验钢在NaCl溶液和NaCl/乙酸混合溶液中的自腐蚀电位负移，耐腐蚀性能降低，而在乙酸溶液中的自腐蚀电位正移，耐腐蚀性能提高；随着浸泡时间的延长，试验钢在NaCl溶液中的自腐蚀电位负移，耐腐蚀性能降低，在乙酸溶液中的自腐蚀电位正移，耐腐蚀性能提高，在NaCl/乙酸混合溶液中的自腐蚀电位未发生明显的变化，耐腐蚀性能基本不变；随着溶液温度的升高，试验钢在不同溶液中的自腐蚀电流密度均增大。

The sensitization degree of 304 stainless steel after heating at 600 ℃ for different times was evaluated by electrochemical potentiodynamic reactivation. The electrochemical corrosion behavior of tested steel with different sensitization degrees in 4vol% acetic acid solution, 5wt% NaCl solution and the two solution mixture with volume ratio of 1∶1, respectively, and the influence of immersion time and solution temperature on the electrochemical corrosion resistance of tested steel with the same degree of sensitization were studied. The results show that with the increase of holding time, the reactivation current of tested steel increased, and the sensitization degree increased. With the increase of sensitization degree, the self-corrosion potential of tested steel in NaCl solution and NaCl/acetic acid mixed solution shifted negatively, and the corrosion resistance decreased; the self-corrosion potential in acetic acid solution shifted positively, and the corrosion resistance was improved. With the extension of immersion time, the self-corrosion potential of tested steel in NaCl solution shifted negatively, and the corrosion resistance decreased; the self-corrosion potential in acetic acid solution shifted positively, and the corrosion resistance was improved; the self-corrosion potential in NaCl/acetic acid mixed solution changed little, and the corrosion resistance was basically unchanged. With the increase of solution temperature, the self-corrosion current densities of tested steel in different solutions all increased.