S32750超级双相不锈钢在NaCl溶液中的临界点蚀温度及电化学腐蚀机理

doi:10.11902/1005.4537.2014.035

中国腐蚀与防护学报

2015, Vol. 35

Issue (2): 106-112 DOI: 10.11902/1005.4537.2014.035

本期目录 | 过刊浏览

S32750超级双相不锈钢在NaCl溶液中的临界点蚀温度及电化学腐蚀机理

何进^1,², 晏敏胜^1,², 杨丽景², Masoumeh Moradi², 宋振纶², 蒋业华¹(

)

1. 昆明理工大学材料科学与工程学院昆明 650093
2. 中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波 315201

Electrochemical Corrosion and Critical Pitting Temperature of S32750 Super Duplex Stainless Steel in NaCl Solution

HE Jin^1,², YAN Minsheng^1,², YANG Lijing², Masoumeh Moradi², SONG Zhenlun², JIANG Yehua¹(

)

1. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2. Key Laboratory of Marine New Materials and Related Technology, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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摘要:

采用电化学测试研究了S32750超级双相不锈钢在3.5%NaCl溶液中的临界点蚀温度 (CPT) 及电化学腐蚀机理,结合试样点蚀前后的形貌变化,得出S32750不锈钢的临界点蚀温度为71 ℃。在低于临界点蚀温度时,不锈钢表面能形成稳定的钝化膜；高于临界点蚀温度时,由于Cl^-的活性增加及钝化膜的溶解,不锈钢表面产生点蚀现象,且温度越高,点蚀越剧烈。构建了双相不锈钢S32750临界点蚀温度前后的电化学腐蚀模型。

关键词 ：双相不锈钢, 临界点蚀温度, 钝化, 腐蚀

Abstract：

The electrochemical corrosion behavior and critical pitting temperature (CPT) of S32750<br>super duplex stainless steel in 3.5%NaCl solution were investigated by electrochemical techniques. The morphologies of the steel before after pitting corrosion were observed by scanning electron microscope. The CPT of the S32750 steel was identified as 71 ℃. A passive film could form on the steel surface when the solution temperature was below the CPT. While, when the solution temperature was above the CPT, pitting corrosion occurred on the steel surface as the result of the breakdown of the passive film due to the increase of the Cl^- activity. Pitting corrosion became more serious with the increasing temperature. Moreover, the corrosion models of the steel below and above the CPT were sketched respectively.

Key words： duplex stainless steel critical pitting temperature passivation corrosion

收稿日期: 2014-03-12

ZTFLH:

TG171

基金资助:国家自然科学基金项目 (51301193)和中国博士后基金面上项目(2013M540503) 资助

作者简介: null

何进，男，1988年生，硕士生

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引用本文:

何进, 晏敏胜, 杨丽景, Masoumeh Moradi, 宋振纶, 蒋业华. S32750超级双相不锈钢在NaCl溶液中的临界点蚀温度及电化学腐蚀机理[J]. 中国腐蚀与防护学报, 2015, 35(2): 106-112.
Jin HE, Minsheng YAN, Lijing YANG, Moradi Masoumeh, Zhenlun SONG, Yehua JIANG. Electrochemical Corrosion and Critical Pitting Temperature of S32750 Super Duplex Stainless Steel in NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 106-112.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.035 或 https://www.jcscp.org/CN/Y2015/V35/I2/106

图1 S32750双相不锈钢的显微组织

图2 S32750双相不锈钢在3.5%NaCl溶液中的动电位极化曲线

图3 自腐蚀电流密度、极化电阻及钝化膜击穿电位随温度的变化规律

图4 S32750双相不锈钢在0.6 V (vs SCE) 恒电位下的电流密度随温度变化曲线

图5 S32750双相不锈钢在不同温度的NaCl溶液中的EIS

图6 S32750双相不锈钢在达到CPT前后腐蚀过程的等效电路

图7 钝化膜的电荷转移电阻随温度的变化规律

表1 根据EIS拟合得到的各等效元件数值

图8 去除直流漂移后随温度变化的噪声曲线

图9 S32750双相不锈钢原始的、未发生点蚀以及发生点蚀后的表面形貌

图10 钝化电位为0.6 V (vs SCE) 时的阳极极化电流密度与温度的关系图

图11 在低于和高于CPT时S32750双相不锈钢表面的钝化和点蚀模型

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