Electrochemical Corrosion Behaviour of AISI 304 SS under Plastic Deformation Condition with Bending Tensile Stress in Dilute Sulphuric Acid Solution
摘 要
运用加载U型弯曲试样研究了塑变拉应力下304不锈钢稀硫酸体系的腐蚀电化学行为。研究了304不锈钢U型弯曲试样拉伸面在0.5 mol·L-1 H2SO4溶液中不同应变量下的极化曲线以及阻抗谱的变化规律,同时研究了U型弯曲试样拉伸面在0.5 mol·L-1 H2SO4+0.2 mol·L-1 KCl溶液中不同应变量下的点蚀保护电位Ep随应变量的变化规律。电化学测试结果表明,U型弯曲试样应变量不同,阻抗谱曲线不同;应变量愈大,阻抗极化电阻Rp愈小,腐蚀速率升高;ΔE=Eb-Ep的大小随着应变量的增加而增大,说明塑性应变愈大,拉伸面钝化膜修复能力愈差,愈易遭受点蚀。
Abstract
The corrosion electrochemical behaviors of 304 stainless steel with tensile stress under plastic deformation condition in dilute sulphuric acid were studied using U-shaped bending specimens. The tensile surface corrosion behaviors of 304 stainless steels of U bend specimens with different strains in 0.5 mol·L-1 H2SO4 solution were studied by polarization curves and impedance spectroscopy. Pitting corrosion protection potentials of the tensile surfaces of U bend specimens with different strains were studied in 0.5 mol·L-1 H2SO4 + 0.2 mol·L-1 KCl. Electrochemical tests show that the larger the plastic strain,the smaller the polarization resistance Rp and the larger the corrosion rate;ΔE=Eb-Ep increased with increasing the strain,indicating that the tensile surface passive film repair ability was poor,and thus susceptible to pitting.
中图分类号 TG174 DOI 10.11973/fsyfh-201509012
所属栏目 试验研究
基金项目 中石油科学研究与技术开发项目(2011D-4603-0102)
收稿日期 2014/9/1
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备注来维亚(1967-),高级工程师,博士,从事化工设备腐蚀与防护研究。
引用该论文: LAI Wei-ya,XU Xin,BAI Zhen-quan,YIN Cheng-xian,XU Xiu-qing,HAN Yan. Electrochemical Corrosion Behaviour of AISI 304 SS under Plastic Deformation Condition with Bending Tensile Stress in Dilute Sulphuric Acid Solution[J]. Corrosion & Protection, 2015, 36(9): 850
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参考文献
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【4】TAKAHASHI S,ECHIGOYA J. Martensitic transformation due to plastic deformation and magnetic properties in SUS 304 stainless steel[J]. Journal of Materials Processing Technology,2001,108:213-216.
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