Effects of Residual Tensile Stresses on Electrochemical Corrosion Behavior of 304 Stainless Steel
摘 要
将304不锈钢制成U型弯曲试样并卸载, 对卸载后拉伸面的残余应力进行了测试, 研究了不同曲率半径(即不同残余拉应力)弯曲试样拉伸面在稀硫酸溶液中的电化学腐蚀行为。结果表明:卸载后U型弯曲试样拉伸面的残余应力为拉应力, 残余应力值随曲率半径的减小而增大; 随着残余拉应力的增大, 试样的致钝电流密度逐渐增大, 维钝电流密度也随之增大, 钝化膜的修复能力减弱, 抗孔蚀能力变差; 残余拉应力越大, 位错密度越高, 腐蚀电流也越大。
Abstract
The 304 stainless steel was processed into U-bend specimen and unloaded, and then the residual stresses at the tensile surface after unloaded were tested. The electrochemical corrosion behavior at the tensile surface of U-bend specimens with different curvature radii (i.e. different residual tensile stresses) in dilute sulphuric acid solution was also studied. The results show that the residual stresses at the tensile surface of U-bend specimen after unloaded were tensile stresses, and the residual stress increased with the decrease of the curvature radius. With the increase of the residual tensile stress, the initiating passivation current density and the passive current density of the specimen increased, while the repairing ability of the passive film weakened, resulting in the decrease of the pitting corrosion resistance. The dislocation density was a relatively high due to the relatively large residual tensile stress, resulting in a relatively large corrosion current.
中图分类号 TG172.6 DOI 10.11973/jxgccl201602020
所属栏目 材料性能及其应用
基金项目 中石油集团公司科学研究与技术开发资助项目(2011D-4603-0102)
收稿日期 2014/12/10
修改稿日期 2015/11/6
网络出版日期
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备注来维亚(1967-), 男, 陕西西安人, 高级工程师, 博士。
引用该论文: LAI Wei-ya,XU Xin,BAI Zhen-quan,YIN Cheng-xian,XU Xiu-qing,HAN Yan. Effects of Residual Tensile Stresses on Electrochemical Corrosion Behavior of 304 Stainless Steel[J]. Materials for mechancial engineering, 2016, 40(2): 84~88
来维亚,徐欣,白真权,尹成先,徐秀清,韩燕. 残余拉应力对304不锈钢电化学腐蚀行为的影响[J]. 机械工程材料, 2016, 40(2): 84~88
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参考文献
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【5】QIAO L J, LUO J L. Hydrogen-facilitated anodic dissolution of austeunitic stainless steel[J].Corrosion,1998,54(4):281-288.
【6】YANG Q, QIAO L J, CHIOVELLI S, et al. Effects of hydrogen on pitting susceptibility of type 310 stainless steel[J]. Corrosion, 1998, 54(8): 628-633.
【7】GUTMAN E M. Mechanochemistry of Solid Surface[M]. Singapore:World Scientific Publishing Company, 1994.
【8】曹楚南.腐蚀电化学原理[M].北京:化学工业出版社, 2004.
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