THE EFFECTS OF SOME ANIONS ON METASTABLEPITTING OF 316L STAINLESS STEEL

J Chin Soc Corr Pro

2002, Vol. 22

Issue (4): 202-206 DOI:

Research Report

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THE EFFECTS OF SOME ANIONS ON METASTABLEPITTING OF 316L STAINLESS STEEL

Haitao Wang;Jingmao Zhao;Yu Zuo

中国科学院金属研究所;材料环境腐蚀试验研究中心

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Abstract The effects of PO3-4,CrO2-4,SO2 -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.PO3-4 ions show the strongest inhibition on metastable pitting,followed by CrO2-4 ion,and SO2-4,and NO- 3 ions have less inhibition effect.Both metastable pitting potential Em and stable pitting potential Ep 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.

Key words: metastable pitting anion nucleation propagation

Received: 15 October 2000

ZTFLH:

TG174.2

Corresponding Authors: Haitao Wang E-mail: htwang@imr.ac.cn

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Haitao Wang; Jingmao Zhao; Yu Zuo. THE EFFECTS OF SOME ANIONS ON METASTABLEPITTING OF 316L STAINLESS STEEL. J Chin Soc Corr Pro, 2002, 22(4): 202-206 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I4/202

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