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。
-
关键词:
- AISI 304不锈钢 /
- 塑性变形 /
- 腐蚀 /
- 电化学
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.-
Keywords:
- AISI 304 SS /
- plastic deformation /
- corrosion /
- electrochemistry
-
-
[1] BARBUCCI A,CERISOLA G,CARBOT P L. Effect of cold-working on the passive behavior of 304 stainless steel in sulfate media[J]. Journal of the Electrochemical Society,2002,149(12):B534-B542. [2] 许淳淳,胡刚. AISI 304不锈钢在冷加工过程中的微观组织变化[J]. 北京化工大学学报,2002,29(6):27-31. [3] SMAGA M,WALTHER F. Deformation-induced martensitic transformation in metastable austenitic steels[J]. Materials Science and Engineering A,2007,712:367-371. [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. [5] LU B T,LUO J L,NORTON P R,et al. Effects of dissolved hydrogen and elastic and plastic deformation on active dissolution of pipeline steel in anaerobic groundwater of near-neutral pH[J]. Acta Materialia,2009,57(1):41-49. [6] ASTM G30 Standard practice for making and using u-bend stress-corrosion test specimens[S]. [7] 余同希，张亮炽. 塑性弯曲理论及其应用[M]. 北京: 科学出版社，1992. [8] LAI W Y,ZHAO W Z,WANG F,et al. EIS study on passive films of AISI 304 stainless steel in oxygenous sulfuric acid solution[J]. Surface and Interface Analysis,2009,41(17):531-539. [9] 曹楚南. 腐蚀电化学原理[M]. 北京: 化学工业出版社，2004. [10] GUTMAN E M. Mechanochemistry of solid surface[M]. Singapore:World Scientific,1994.
计量
- 文章访问数: 1
- HTML全文浏览量: 0
- PDF下载量: 2
下载:
