316L不锈钢在不同环境中点蚀形核研究

doi:10.11868/j.issn.1001-4381.2015.09.003

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摘要

通过人工海水中长期浸泡实验和循环伏安极化曲线测试,研究了温度、Cl^-浓度、溶解氧浓度对抛光后的316L不锈钢点蚀形核的影响,确定了不锈钢在不同环境的人工海水中点蚀的萌生时间和位置。结果表明:与温度和Cl^-浓度的影响不同,溶解氧浓度的增加对不锈钢点蚀形核具有抑制作用。316L不锈钢在4℃,8×10^-6溶解氧浓度,10%(质量分数)NaCl溶液中浸泡后表面出现钝化膜局部破坏,点蚀形核时间为60~70天,形核位置存在MgO-Al₂O₃系和CaO-SiO₂系非金属夹杂物。不锈钢在4℃人工海水和0.02×10^-6溶氧量浓度下浸泡后,表面出现点蚀的时间为70~80天。

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	王晶
	尚新春
	路民旭
	张雷

关键词 ：不锈钢, 点蚀, 形核, 钝化膜, 夹杂物

Abstract：

Effect of temperature, concentration of chloride ion and dissolved oxygen concentration on pitting nucleation of polished 316L stainless steel was investigated using long-term immersing experiment and cyclic potentiodynamic polarization curves. Pitting initiated time and location in different artificial sea water environments were determined. The results show that pitting nucleation can be inhibited with increasing dissolved oxygen concentration, which is different from effect of temperature and chloride ion. For 316L stainless steel, after immersed in 10% (mass fraction) NaCl solution with 8×10^-6 dissolved oxygen concentration at 4℃, local destroy occurs on the surface passive film, pitting nucleation time is 60-70 days, and MgO-Al₂O₃ series and CaO-SiO₂ oxide series non-metal inclusions exist at the pitting nucleation sites. After immersed in artificial sea water at 4℃, and with 0.02×10^-6 dissolved oxygen concentration, the time for pitting corrosion appears on the surface of 316 stainless steel is 70-80 days.

Key words： stainless steel pitting corrosion nucleation passive film inclusion

收稿日期: 2015-03-17 出版日期: 2015-09-26

基金资助:国家科技重大专项项目(2011ZX05056);国家自然科学基金资助项目(51271025)

通讯作者: 王晶 E-mail: wzw0701@163.com

作者简介: 王晶(1983-),女,博士,研究方向:金属材料的腐蚀与防护,联系地址:北京市海淀区北四环中路229号海泰大厦1702室(100083),E-mail:wzw0701@163.com

引用本文:

王晶, 尚新春, 路民旭, 张雷. 316L不锈钢在不同环境中点蚀形核研究[J]. 材料工程, 2015, 43(9): 12-18.
Jing WANG, Xin-chun SHANG, Min-xu LU, Lei ZHANG. Pitting Nucleation of 316L Stainless Steel in Different Environments. Journal of Materials Engineering, 2015, 43(9): 12-18.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.09.003 或 http://jme.biam.ac.cn/CN/Y2015/V43/I9/12

Table 1 316L不锈钢化学成分(质量分数/%)

Table 2 人工海水成分(g·L^-1)

Fig.1 电化学测试装置示意图

Table 3 NaCl溶液中的腐蚀浸泡实验参数

Fig.2 316L不锈钢在4℃，8×10^-6溶氧量，10%NaCl溶液中浸泡70天后的点蚀萌生形貌和夹杂物
(a)点蚀形貌一；(b)点蚀形貌二；(c)图(a)中的夹杂物能谱分析；(d)图(b)中的腐蚀产物能谱分析

Table 4 人工海水腐蚀浸泡实验参数与结果

Fig.3 316L不锈钢在不同环境中浸泡后的点蚀形貌
(a)4℃,0.02×10^-6；(b)4℃,8×10^-6；(c)20℃,0.02×10^-6；(d)20℃,8×10^-6

Fig.4 316L不锈钢在不同温度下的循环伏安曲线
(a)以及E_R和E_P对比图(b)

Fig.5 316L不锈钢在不同Cl^-浓度下的极化曲线
(a)和点蚀电位(b)

Fig.6 316L不锈钢在不同氧含量下的循环伏安曲线

Fig.7 抛光后的316L不锈钢在溶液中自腐蚀电位变化

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