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| INFLUENCE OF HYDROSTATIC PRESSURE ON THE PITTING BEHAVIOR OF Fe-20Cr Alloy |
| YANG Yange1; CUIZhongyu1; CHEN Jie1; CAO Jingtao1; ZHANG Tao1;2; SHAO Yawei1;2; MENG Guozhe1;2; WANG Fuhui1;2 |
1. Corrosion and Protection Laboratory; College of Material Science and Chemical Engineering;Harbin Engineering University; Harbin 150001
2. State Key Laboratory for Corrosion and Protection;Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Abstract The effect of hydrostatic pressure on pitting behavior of Fe-20Cr alloy in 3.5% NaCl solution was investigated by means of potentiodynamic polarization and potentiostatic technology. For the polarization curve measurement, the specimens were kept for 1 h in the NaCl solution at various hydrostatic pressures and then scanned in 0.333 mV/s, 3 mV/s, and 5 mV/s scan rate respectively. For the induction time measurement, the specimen was pretreated in Na2SO4 solution at a constant potential, -0.22 V, for 500 s. After pretreatment, the specimen was kept in the NaCl solution at various hydrostatic pressures, and a potentiostatic technique\linebreak(-0.22 V) was used to measure the anodic current trace. Experiment data was analyzed based on statistical and stochastic approaches. With the increasing of hydrostatic pressure, the pit corrosion resistance of Fe-20Cr alloy was deteriorated, which was distinguished by the decrease of Ecrit and the increase of passive current density.The results also showed that there were obvious effects on processes of pit initiation and pit growth of Fe-20Cr alloy: (1) the pit generation rate was evidently increased compared with that under lower hydrostatic pressure resulting from the metastable pits' frequent initiation and increased tendency to stable pits. However, it seemed that pit generation mechanism showed no hydrostatic pressure dependence. (2) the probability of pit growth increased with the increasing of hydrostatic pressure, which implied that the metastable pit on Fe-20Cr alloy exhibited higher probability to become larger pit cavity during the same time interval than that under lower hydrostatic pressure.
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Received: 27 October 2008
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Corresponding Authors:
YANG Yange
E-mail: zhangtao@hrbeu.edu.cn
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