用恒电位和动电位极化法研究了PO3-4、CrO2- 4、SO2-4和NO-3 4种阴离子对316L不锈钢亚稳态孔蚀行为的影响.4种阴 离子均抑制亚稳态小孔的形核速率和生长速率，其中PO3-4离子作用最强，CrO 2-4离子次之，SO2-4和NO-3离子作用较弱.亚稳态孔蚀开始出现的电位 Em和稳定孔蚀电位Ep均随离子浓度的对数增大而直线升高.讨论了不同离子的作 用机制.
The effects of PO3-4,CrO2-4,SO2 -4and NO-3 anions on the nucleation and growth of metastable pitting of 316L stainless steel in NaCl solutions were investigated using potentiostatic an d potentiodynamic polarization tests.The four anions all retard nucleation and t he growth of metastable pitting.PO3-4 ions show the strongest inhibition on metastable pitting,followed by CrO2-4 ion,and SO2-4,and NO- 3 ions have less inhibition effect.Both metastable pitting potential Em and stable pitting potential Ep increase almost linearly with logarithm of each anion concentration,and have very close increasing slopes.The inhibition m echanisms of the four anions were also discussed in this paper.
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