通过电化学试验和浸泡试验,采用动电位扫描技术、交流阻抗技术、扫描电子显微镜分析等方法研究了304不锈钢在模拟煤化工灰水介质中的点蚀行为,探讨了Cl-、SO 2-4、pH对点蚀行为的影响.结果表明:在试验条件下,随着灰水介质中Cl-含量的增加,试验钢的点蚀程度增大,当Cl-质量分数为300 mg??kg-1时,点蚀程度最轻;随着灰水介质中SO 2-4含量的增加,试验钢的点蚀程度降低,当SO 2-4质量分数为2000 mg??kg-1时,点蚀程度最轻;随着灰水介质pH的增大,试验钢的点蚀程度降低,当pH为10时,点蚀程度最轻.%The effect of Cl- ,SO 2-4 and pH on pitting behavior of 304 stainless steel in simulated ash water of coal chemical industry was studied through electrochemical test and dipping test by potential scanning technology, AC impedance technology and scanning electron microscopy analysis.The results show that in test condition,the pitting degree of tested steel increased with increase of Cl- content in the simulate ash water and the tested steel had the lightest pitting degree when mass fraction of Cl- was 300 mgkg-1 .With increase of SO 2-4 content in the simulate ash water,the pitting degree of tested steel decreased.When mass fraction of SO 2-4 was 2000 mg kg-1 , the tested steel had the lightest pitting degree.With increase of pH in the simulate ash water,the pitting degree of tested steel decreased.The tested steel had the lightest pitting degree when the pH was 10.
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