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J Chin Soc Corr Pro  2002, Vol. 22 Issue (3): 158-161     DOI:
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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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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     
ZTFLH:  TG174.2  
Corresponding Authors:  Haitao Wang     E-mail:  htwang@imr.ac.cn

Cite this article: 

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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https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2002/V22/I3/158

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