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| STUDY ON EFFECT FACTORS TO PITTING POTENTIAL OF 321 STAINLESS STEEL |
| Zhanfeng Cao;Ljie Qiao;Wuyang Zhu |
| 北京科技大学 |
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Abstract The effects of temperature,pH,Cl- and SO2-4 concentration on pitting potential of 321 stainless steel were investigated by using quadrature test design and contrastive test.The results of quadrature test design showed temperature and Cl- (Cl-≥0.014 mol/L) concentration remarkably influenced pitting potential Eb,but pH(6～9) value did not.The results of contrastive test indicated Cl- concentration had no effect on Eb when Cl-≤0.014 mol/L,but Eb enhanced with the increasing of Cl- concentration when Cl->0.014 mol/L.Increasing the temperature shifted the critical potential to more active values.If Cl-=0,SO2-4 concentration had no effect on Eb,but if Cl-=0.028 mol/L,Eb enhanced with the increasing of SO2-4 concentration.
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Received: 14 December 2004
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Corresponding Authors:
Zhanfeng Cao
E-mail: lqiao@ustb.edu.cn
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