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中国腐蚀与防护学报  2017, Vol. 37 Issue (2): 162-167    DOI: 10.11902/1005.4537.2015.231
  研究报告 本期目录 | 过刊浏览 |
316L不锈钢在不同pH值硼酸溶液中的电化学行为研究
王彦亮,陈旭(),王际东,宋博,范东升,何川
辽宁石油化工大学石油天然气工程学院 抚顺 113001
Electrochemical Behavior of 316L Stainless Steel in Borate Buffer Solution with Different pH
Yanliang WANG,Xu CHEN(),Jidong WANG,Bo SONG,Dongsheng FAN,Chuan HE
School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
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摘要: 

采用动电位极化、电化学阻抗及Mott-Schottky技术研究了316L不锈钢在pH值分别为4,7和11的硼酸溶液中钝化膜的电化学行为,并对钝化膜成分进行了X射线光电子能谱分析。结果表明：316L不锈钢在酸性、中性和碱性硼酸溶液中均能形成稳定的钝化膜,且随pH值增加钝化电位区间减小,过钝电位显著下降。碱性硼酸溶液中316L不锈钢过钝电流显著增加。钝化膜完整性在中性硼酸溶液中最好,酸性溶液中最差。Mott-Schottky曲线结果表明,在酸性环境中随着电位的升高,钝化膜由n型向p型转变;在中性和碱性环境中,钝化膜半导体类型分别为n型和p型。这是由于随pH值增加,Cr的氢氧化物消失,钝化膜中Fe由FeO(OH) 转变为Fe3O4;在碱性环境下钝化膜中Cr2O3含量减少导致耐蚀性下降。
关键词 ： 316L不锈钢,  pH值,  钝化膜,  电化学,  XPS    
Abstract：

The electrochemical characteristics of the passivation film formed on 316L stainless steel in borate buffer solutions with pH of 4, 7 and 11, respectively were characterized by means of potentiodynamic polarization, electrochemical impedance spectroscopy and Mott-Schottky technology. The composition of passive film was analysized by X-ray photoelectron spectroscopy (XPS). The results showed that the stable passivation film could form on the steel surface in all the three borate buffer solutions. The passivation potential range decreased and the transpassive potential dropped significantly with the increasing pH value. The transpassive current of 316L stainless steel in alkaline borate buffer solution increased significantly. The integrity of the passive film was the best in the neutral solution, while it was the worst in the acid solution. The Mott-Schottky results showed that the semiconductor type of the passive film transferred from n-type to p-type with the increasing potential in acid solution. It was n-type and p-type semiconductor in the neutral and alkaline solution, respectively. It was attributed to that the chromium hydroxide dropped down and the formed iron compound was transformed from FeO(OH) to Fe3O4. The content of Cr2O3 was decreased in alkaline solution, which resulted in lower corrosion resistance.
Key words： 316L stainless steel    pH    passivation film    electrochemical behavior    XPS
收稿日期: 2015-12-23     
基金资助:国家自然科学基金 (51201009) 和辽宁省自然科学基金 (2013020078)
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王彦亮
陈旭
王际东
宋博
范东升
何川

引用本文:

王彦亮,陈旭,王际东,宋博,范东升,何川. 316L不锈钢在不同pH值硼酸溶液中的电化学行为研究[J]. 中国腐蚀与防护学报, 2017, 37(2): 162-167.
Yanliang WANG, Xu CHEN, Jidong WANG, Bo SONG, Dongsheng FAN, Chuan HE. Electrochemical Behavior of 316L Stainless Steel in Borate Buffer Solution with Different pH. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 162-167.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.231      或      https://www.jcscp.org/CN/Y2017/V37/I2/162

图1  316L不锈钢在不同pH值溶液中的极化曲线
pH Ecorr V Passive potential range V IpμAcm-2
4 -0.527 -0.318~1.14 0.295
7 -0.220 0.096~0.959 0.323
11 -0.378 -0.03~0.703 0.426
表1  极化曲线拟合结果
图2  316L不锈钢在不同pH值溶液中的EIS
图3  等效模拟电路
pH Rs / Ωcm2 Q1 / Fcm-2 n1 R1 / Ωcm2 Q2 / Fcm-2 n2 R2 / Ωcm2
4 0.34 1.07×10-4 0.887 1.73×10-5 4.25×10-10 1.00 1156
7 0.01 3.29×10-10 1.000 1446 7.50×10-5 0.82 2.29×105
11 189 7.60×10-5 0.999 16.47 5.48×10-5 0.89 1.38×105
表2  EIS等效电路拟合结果
图4  316L不锈钢在不同pH值溶液中的Mott-Schottky曲线
图5  316L不锈钢在不同pH值溶液中形成的钝化膜的XPS谱
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