高Mo超级奥氏体不锈钢耐Cl<sup>-</sup>腐蚀性能分析

doi:10.11902/1005.4537.2022.100

中国腐蚀与防护学报

2022, Vol. 42

Issue (5): 765-770 DOI: 10.11902/1005.4537.2022.100

研究报告

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高Mo超级奥氏体不锈钢耐Cl^-腐蚀性能分析

吕迎玺(

)

山西省机电设计研究院有限公司太原 030009

Analysis of Cl^- Corrosion Resistance of High Mo Super Austenitic Stainless Steels

LV Yingxi(

)

Shanxi Mechanical and Electrical Design and Research Institute Co. Ltd., Taiyuan 030009, China

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摘要:

对比分析了不同Mo含量的316L、904L、S31254和S31254-B奥氏体不锈钢在10%NaCl溶液中的腐蚀行为,及其固溶处理、低温时效处理对其耐蚀性的影响；利用扫描电子显微镜、电化学极化曲线和电化学阻抗谱对4种不锈钢的显微组织、耐蚀性和表面腐蚀形貌进行了分析。结果表明：4种不锈钢在10%NaCl溶液中有不同的耐蚀性能,耐蚀性排序为：低温时效态>固溶态,S31254-B>S31254>904L>316L。Mo含量的提高、微量合金元素B加入奥氏体、低温时效处理均有利于提升材料的耐蚀性能。B促使表面形成富Cr、Mo氧化物的钝化膜,提升钝化层的致密化,减缓晶界处贫Cr、贫Mo区,提高耐蚀性。

关键词 ：奥氏体不锈钢, 耐蚀性, 电化学腐蚀, Mo

Abstract：

The increase of Mo content can improve the corrosion resistance of austenitic stainless steel. In this paper, the corrosion behavior of four austenitic stainless steels 316L, 904L, S31254 and S31254-B with different Mo content in 10%NaCl solution has been comparatively examined. The effect of solution treatment and low temperature aging treatment on the corrosion resistance of steels was compared. The microstructure, corrosion resistance and surface corrosion morphology of the four stainless steels were characterized by means of scanning electron microscope, electrochemical scanning polarization curves and electrochemical impedance spectroscope. The results show that the four stainless steels present different corrosion performance in 10%NaCl solution, their corrosion resistance can be ranked as follows: low temperature aging state>solid solution state for all steels; whilst S31254-B>S31254>904L>316L. The increase of Mo content, the addition of B and the aging treatment at low temperature can improve the corrosion resistance of the steels. Meanwhile, B can promote the formation of Cr- and Mo-rich oxides in the outer layer of passivation film, which makes the surface of passivation film much compact, and the lean-Cr and -Mo regions at grain boundaries can be slowed down, therewith the corrosion resistance of the steels can be improved significantly.

Key words： Austenitic stainless steel corrosion resistance electrochemical corrosion Mo

收稿日期: 2022-04-09

ZTFLH:

TF764

通讯作者: 吕迎玺 E-mail: LYX6746@163.com

Corresponding author: LV Yingxi E-mail: LYX6746@163.com

作者简介: 吕迎玺,男,1965年生,高级工程师

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引用本文:

吕迎玺. 高Mo超级奥氏体不锈钢耐Cl^-腐蚀性能分析[J]. 中国腐蚀与防护学报, 2022, 42(5): 765-770.
Yingxi LV. Analysis of Cl^- Corrosion Resistance of High Mo Super Austenitic Stainless Steels. Journal of Chinese Society for Corrosion and protection, 2022, 42(5): 765-770.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.100 或 https://www.jcscp.org/CN/Y2022/V42/I5/765

表1 4种不锈钢的化学成分

图1 4种不锈钢1220 ℃固溶处理后显微组织

图2 4种不锈钢固溶并410 ℃低温时效处理后显微组织

图3 S31254-B不锈钢经410 ℃低温时效处理后晶界区域能谱分析

图4 4种不锈钢在10%NaCl溶液中的极化曲线

表2 4种不锈钢极化曲线特征值

图5 4种不锈钢在10%NaCl溶液中电化学阻抗谱

图6 4种不锈钢固溶处理后动电位极化后表面形貌

图7 4种不锈钢固溶并410 ℃时效后动电位极化后表面形貌

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