EFFECT OF SURFACE ROUGHNESS ON METASTABLE PITTING BEHAVIOR OF STAINLESS STEEL

J Chin Soc Corr Pro

2002, Vol. 22

Issue (3): 158-161 DOI:

Research Report

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EFFECT OF SURFACE ROUGHNESS ON METASTABLE PITTING BEHAVIOR OF STAINLESS STEEL

Haitao Wang;Yu Zuo;Jinping Xiong

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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Haitao Wang; Yu Zuo; Jinping Xiong. EFFECT OF SURFACE ROUGHNESS ON METASTABLE PITTING BEHAVIOR OF STAINLESS STEEL. J Chin Soc Corr Pro, 2002, 22(3): 158-161 .

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Abstract The metastable pitting behavior of 316L stainless s teel with different surface roughness in 0.01 mol/L NaCl solution was studie d us ing potentiostatic and potentiodynamic polarization methods and statistical trea tments.As surface roughness decreased,the nucleation rate of metastable pits dec reased.The peak current of metastable pits also decreased,but the average growth rate of metastable pits showed a slight increase.An openness parameter,w/d, was suggested to characterize the openness of surface grooves,in which w is the width of the groove at the opening and d the depth of the groove.Bigger w/d value means more smooth surface,and it is more difficult for micro-pit t o nucleate.Under certain condition of solution and potential,there is a critical w/d value.Metastable pits may nucleate only on those surfaces whose w/d values are lower than the critical value.As the openness parameter w/d incr eases,the nucleation rate of metastable pits decreases linearly,and both metasta ble pitting potential Em and pitting potential Ep move in the positi ve direction.

Key words: stainless steel metastable pitting surface roughness

Received: 10 October 2000

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