论文

304不锈钢在3.5\%NaCl溶液中的点蚀动力学及机理

  • 杜楠 ,
  • 田文明 ,
  • 赵晴 ,
  • 陈四兵
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  • 南昌航空大学轻合金加工科学与技术国防重点学科实验室, 南昌 330063
杜楠, 男, 1956年生, 教授

收稿日期: 2012-01-04

  修回日期: 2012-03-20

  网络出版日期: 2012-07-11

基金资助

国家自然科学基金资助项目51071083

PITTING CORROSION DYNAMICS AND MECHANISMS OF 304 STAINLESS STEEL IN 3.5%NaCl SOLUTION

  • DU Nan ,
  • TIAN Wen-Meng ,
  • DIAO Qing ,
  • CHEN Si-Bing
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  • National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology Institute, Nanchang Hangkong University, Nanchang 330063

Received date: 2012-01-04

  Revised date: 2012-03-20

  Online published: 2012-07-11

摘要

利用激光电子散斑干涉(ESPI)、电化学噪声(EN)及三维视频显微技术研究304不锈钢在3.5%NaCl溶液中点蚀早期单个蚀孔的发展动力学及其机理. 结果表明在0.05 V恒电位极化下, 点蚀过程可分为4个阶段: 首先, 电流噪声在740 s时发生剧烈波动, 钝化膜开始破裂, 点蚀孕育期为740 s; 其次, ESPI图像在750 s时产生可见光斑, 稳态蚀孔萌生期为10 s; 再次, 750-780 s时, 蚀孔的发展速率不断增加, 表明点蚀处于活性溶解期; 最后, 蚀孔生长速率迅速下降, 发生钝化, 而在793 s后, 由于出现次生蚀孔, 生长速率再次上升. 使用三维视频显微镜观察蚀孔形貌并测量蚀坑体积的变化, 印证了由腐蚀产物浓度分析法得到的单个蚀孔的生长速率, 并在蚀坑底部观察到了次生蚀孔.

本文引用格式

杜楠 , 田文明 , 赵晴 , 陈四兵 . 304不锈钢在3.5\%NaCl溶液中的点蚀动力学及机理[J]. 金属学报, 2012 , 48(7) : 807 -814 . DOI: 10.3724/SP.J.1037.2012.00005

Abstract

Pitting rate of a single pit and pitting mechanisms of the 304 stainless steel in 3.5%NaCl solution were investigated by utilizing electronic speckle pattern interferometer (ESPI), electrochemical noise (EN) and three-dimensional video microscope. The results show that under 0.05 V polarization, the pitting corrosion process can be divided into four stages: drastic fluctuations of the current noise occured at 740 s, which means the passivation film was breaking, thus it can be concluded that the span of pitting incubation period is 740 s; a speckle occurred on the ESPI image at 750 s, thus the span of initiation period of the steady pitting is about 10 s; the growth rate of the pit increased during 750-780 s, which indicates that the pit corrosion is in active dissolution period; since then, the growth rate of the pit declined rapidly which means the pit was repassivated. After\linebreak 793 s, the growth rate of the pit raised again as secondary pits emerged. The pit image was observed and its volume was measured by three-dimensional video microscope, and the results were in agreement with those which were obtained by corrosion product concentration analysis. Some secondary pits were found in the bottom of the pit in three-dimensional reconstruction images.

参考文献

[1] Liao J X, Jiang Y M,WuWW, Zhong C, Li J. Acta Metall Sin, 2006; 42: 1187

(廖家兴, 蒋益明, 吴玮巍, 钟澄, 李劲. 金属学报, 2006; 42: 1187)

[2] Han D, Jiang Y M, Deng B, Zhang L H, Zhang W, Li J. Acta Metall Sin, 2009; 45: 919

(韩冬, 蒋益明, 邓博, 张丽华, 张伟, 李 劲. 金属学报, 2009; 45: 919)

[3] Dong C F, Luo H, Xiao K, Sun T, LiuQ, Li XG. J Wuhan Univ Technol–Mater Sci, 2011; 26: 641

[4] Li H B, Jiang Z H, Yang Y, Cao Y, Zhang Z R. J Metall Mater, 2009; 16: 517

[5] Li G M, Guo X P, Zheng J S. J Iron Steel Res, 2004; 11(4): 47

[6] Hu L H, Du N, Wang M F, Zhao Q. J Chin Soc Corros Prot, 2007; 27: 233

(胡丽华, 杜楠, 王梅丰, 赵晴. 中国腐蚀与防护学报, 2007; 27: 233)

[7] Hong J F, Tan H, Chen L D, Li J, Li L, Jiang Y M. Acta Metall Sin, 2011; 47: 1445

(洪巨峰, 谭华, 陈林豆, 李 劲, 李莉, 蒋益明. 金属学报, 2011; 47: 1445)

[8] Tan Y J, Balley S, Kinsella B. Corros Sci, 1996; 38: 1681

[9] Smulko J, Darouicki K. J Electroanal Chem, 2003; 545: 59

[10] Wang M F, Du N, Li X G, Zhao Q, Liu G. Corros Prot, 2009; 30(1): 29

(王梅丰, 杜楠, 李晓刚, 赵 晴, 刘 刚. 腐蚀与防护, 2009; 30(1): 29)

[11] Wang M F, Li X G, Du N, Huang Y Z, Korsunsky A. Electrochem Commun, 2008; 10: 1000

[12] Pan Y, Zhang S P, Zhou J L, Li X G, Xiao Y D. Equip Environ Eng, 2010; 7(4): 67

(潘莹, 张三平, 周建龙, 李晓刚, 萧以德. 装备环境工程, 2010; 7(4): 67)

[13] Lian C H, Gao Y. Chem Eng Mach, 1995; 22(2): 87

(梁成浩, 高扬. 化工机械, 1995; 22(2): 87)

[14] Ye T, Gao C Z. Mater Prot, 2007; 40(11): 78

(叶涛, 高灿柱. 材料保护, 2007; 40(11): 78)

[15] Liu G. Master Dissertation, Nanchang Hangkong Univ, 2008

(刘刚. 南昌航空大学硕士学位论文, 2008)

[16] Pujar M G, Anita T, Shaikh H, Dayul R K, Khatak H S. J Mater Eng Perform, 2007; 16: 494

[17] Jong J K. Met Mater Int, 2011; 17: 777

[18] Du N, Huang L, Xu S, Wang L Q. Failure Anal Prev, 2009; 4: 71

(杜楠, 黄乐, 徐 珊, 王力强. 失效分析与预防, 2009; 4: 71)

[19] Du N, Liu G, Zhao Q. Mater Sci, 2008; 2: 326

[20] Jong J K. Met Mater Int, 2009; 15: 279

[21] Girija S, Kamachi U, Mudali B R. Appl Electrochem, 2011; 41: 973

[22] Yu Q B, Sun Y. Hot Work Technol, 2010; 39(2): 1

(于庆波, 孙莹. 材料热处理技术, 2010; 39(2): 1)

[23] Chen Y F, Rairdan R, Luo J L. Appl Electrochem, 1998; 28: 1371

[24] Zhang J Q, Zhang Z. J Chin Soc Corros Prot, 2002; 22: 241

(张鉴清, 张昭. 中国腐蚀与防护学报, 2002; 22: 241)

[25] Zhang Z, Zhang J Q. Chin J Nonferrous Met, 2001; 11: 284

(张昭, 张鉴清. 中国有色金属学报, 2001; 11: 284)

[26] Li L, Li X G, Dong C f, Cheng Y F. Corros Eng Sci Tech, 2011; 46: 340

[27] Sun D M, Jiang Y M, Tang Y, Xiang Q W, Zhong C, Liao J X, Li J. Electrochim Acta, 2009; 54: 1558

[28] Frankel G S. J Electrochem Soc, 1998; 145: 2186
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