不同组织的316L不锈钢在NH<sub>4</sub>Cl环境下应力腐蚀行为与机理

doi:10.11902/1005.4537.2020.172

中国腐蚀与防护学报

2021, Vol. 41

Issue (6): 811-818 DOI: 10.11902/1005.4537.2020.172

研究报告

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不同组织的316L不锈钢在NH₄Cl环境下应力腐蚀行为与机理

孙宝壮¹, 周霄骋¹, 李晓荣², 孙玮潞³, 刘子瑞¹, 王玉花⁴, 胡洋⁴, 刘智勇¹(

)

^1.北京科技大学国家材料腐蚀与防护科学数据中心新材料技术研究院北京 100083
^2.天津大港油田集团工程建设有限责任公司天津 300280
^3.天津科技大学经济与管理学院天津 300222
^4.中国石油化工股份有限公司齐鲁分公司淄博 255434

Stress Corrosion Cracking Behavior of 316L Stainless Steel with Varying Microstructure in Ammonium Chloride Environment

SUN Baozhuang¹, ZHOU Xiaocheng¹, LI Xiaorong², SUN Weilu³, LIU Zirui¹, WANG Yuhua⁴, HU Yang⁴, LIU Zhiyong¹(

)

^1.National Materials Corrosion and Protection Science Data Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
^2.Tianjin Dagang Oilfield Group Engineering Construction Co. Ltd. , Tianjin 300280, China
^3.College of Economics and Management, Tianjin University of Science & Technology, Tianjin 300222, China
^4.SINOPEC Qilu Petrochemical Company, Zibo 255434, China

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摘要:

采用动电位极化曲线、电化学阻抗谱以及U形弯试样浸泡实验研究了不同组织 (原始组织、固溶组织与敏化组织) 的316L不锈钢在NH₄Cl环境下的应力腐蚀开裂 (SCC) 行为与机理，分析了NH₄Cl浓度对不同热处理状态的316L不锈钢应力腐蚀行为和机理的影响。结果表明：不同组织的316L不锈钢在NH₄Cl环境中均具有明显的SCC敏感性，原始组织、固溶组织、敏化组织的SCC敏感性依次升高；随着NH₄Cl溶液浓度升高，316L不锈钢不同组织的钝化膜稳定性降低，原始组织、固溶组织及敏化组织在NH₄Cl环境下，破钝电位依次降低，维钝电流密度依次升高，阻抗值依次减小，钝化膜更加活泼易破坏，饱和NH₄Cl浓度下极易发生点蚀导致SCC的萌生。316L不锈钢在NH₄Cl环境中的SCC裂纹扩展机制主要为穿晶型阳极溶解机制。

关键词 ： 316L不锈钢, NH₄Cl环境, 热处理, 应力腐蚀开裂

Abstract：

The stress corrosion cracking (SCC) behavior in NH₄Cl solutions was studied by means of potentiodynamic polarization measurement, electrochemical impedance spectra (EIS) measurement for 316L stainless steel with microstructures corresponding with different status of the steel, including as-received, solid solution- and sensitization-treatment. The results show that 316L stainless steels exert high SCC susceptibility in NH₄Cl containing environment, which increases in the order of as-received, solid solution- and sensitization-treatment. With the rising NH₄Cl concentration, the stability of passive film degrades, the passive current density increases, the breakdown potential and polarization resistance decline. In particular, in the saturated NH₄Cl solution, pits are prone to initiate, which leads to the occurrence of SCC. In NH₄Cl solution, SCC of 316L stainless steel is dominated by anodic dissolution (AD) process, and the SCC cracks propagate transgranularly.

Key words： 316L stainless steel ammonium chloride environment heat treatment stress corrosion cracking

收稿日期: 2020-09-23

ZTFLH:

TG172

基金资助:国家重点研发计划(2017YFF0210404)

通讯作者: 刘智勇 E-mail: liuzhiyong7804@126.com

Corresponding author: LIU Zhiyong E-mail: liuzhiyong7804@126.com

作者简介: 孙宝壮，男，1994年生，博士生

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引用本文:

孙宝壮, 周霄骋, 李晓荣, 孙玮潞, 刘子瑞, 王玉花, 胡洋, 刘智勇. 不同组织的316L不锈钢在NH₄Cl环境下应力腐蚀行为与机理[J]. 中国腐蚀与防护学报, 2021, 41(6): 811-818.
Baozhuang SUN, Xiaocheng ZHOU, Xiaorong LI, Weilu SUN, Zirui LIU, Yuhua WANG, Yang HU, Zhiyong LIU. Stress Corrosion Cracking Behavior of 316L Stainless Steel with Varying Microstructure in Ammonium Chloride Environment. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 811-818.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.172 或 https://www.jcscp.org/CN/Y2021/V41/I6/811

图1 不同热处理组织316L不锈钢的微观形貌

图2 不同组织316L不锈钢在不同浓度NH4Cl溶液中的动电位极化曲线

图3 不同组织316L不锈钢在不同浓度NH4Cl溶液中破钝电位Eb和腐蚀电流Icorr拟合结果

图4 不同组织316L不锈钢在不同浓度NH4Cl溶液中的电化学阻抗谱

图5 电化学阻抗谱等效电路示意图

图6 316L不锈钢U形弯试样在不同浓度沸腾NH4Cl溶液中浸泡30 d微观形貌

图7 不同组织316L不锈钢在饱和NH4Cl沸腾溶液中裂纹扩展SEM像

图8 不同组织316L不锈钢在饱和NH4Cl沸腾溶液中裂纹沿厚度扩展SEM像

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