8367、904L和316L奥氏体不锈钢的耐点蚀性能研究

张度宝, 方可伟, 罗坤杰, 范国辉, 李成涛, 王力, 沈剑

doi:10.16577/j.issn.1001-1560.2022.0128

材料保护 >

2022 , Vol. 55 >Issue 5: 80 - 85

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0128

试验研究

8367、904L和316L奥氏体不锈钢的耐点蚀性能研究

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1. 苏州热工研究院电站寿命管理技术中心； 2. 生态环境部核与辐射安全中心

方可伟(1984-)，高级工程师，硕士，从事核电金属材料高温高压水应力腐蚀研究，电话：0512-68701730，E - mail: fangkewei@cgnpc.com.cn

收稿日期: 2021-12-14

修回日期: 2022-01-18

录用日期: 2022-02-22

网络出版日期: 2024-01-08

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Research on Pitting Corrosion Resistance of 8367, 904L and 316L Austenitic Stainless Steels

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1. Plant Life Management Research Center, Suzhou Nuclear Power Research Institute, Suzhou 215004, China;2. Nuclear and Radiation Safety Center, Beijing 100089, China

Received date: 2021-12-14

Revised date: 2022-01-18

Accepted date: 2022-02-22

Online published: 2024-01-08

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摘要

为了研究8367、904L和316L奥氏体不锈钢在不同环境下的的耐点蚀性能，采用电化学试验和浸泡腐蚀试验，从点蚀当量、临界点蚀温度、点蚀电位和腐蚀速率等方面进行了分析。结果表明：8367、904L和316L不锈钢在3.5% NaCl溶液中的临界点蚀温度分别为66，50，15 ℃；随着介质温度的升高，8367的临界点蚀点位无明显变化，904L 和 316L的临界点蚀点位则逐渐降低，且Eb(8367)>Eb(904L)>Eb(316L)；8367不锈钢在20 ℃和50 ℃的4% FeCl3溶液中均具有较低的腐蚀速率，且随着温度升高，腐蚀速率无明显变化；904L和316L在20 ℃和50 ℃的4%FeCl3溶液中的腐蚀速率均大于8367，且随着温度升高，904L和316L的腐蚀速率大幅度增大。

关键词： 8367; 904L; 316L; 临界点蚀温度; 点蚀电位; 腐蚀速率

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张度宝, 方可伟, 罗坤杰, 范国辉, 李成涛, 王力, 沈剑 . 8367、904L和316L奥氏体不锈钢的耐点蚀性能研究[J]. 材料保护, 2022 , 55(5) : 80 -85 . DOI: 10.16577/j.issn.1001-1560.2022.0128

Abstract

In order to study the pitting corrosion resistances of 8367, 904L and 316L austenitic stainless steels in different environments, electrochemical tests and immersion corrosion tests were used to analyze the pitting equivalent, critical pitting temperature, pitting potential, and corrosion rate. Results showed that the critical pitting temperatures of 8367, 904L and 316L stainless steels in 3.5% NaCl solution were 66 ℃, 50 ℃ and 15 ℃, respectively. The critical pitting position of 8367 had no obvious change with the increase of medium temperature, while the critical pitting positions of 904L and 316L stainless steels decreased gradually, leading to a result that Eb(8367)>Eb(904L)>Eb(316L). Moreover, 8367 stainless steel had low corrosion rates at 20 ℃ and 50 ℃ in 4% FeCl3 solution, and the corrosion rates changed little with the increase of temperature. The corrosion rates of 904L and 316L stainless steel in 4% FeCl3 solution at 20 ℃ and 50 ℃ were higher than that of 8367 stainless steel, and the corrosion rates increased greatly with the rising of temperature.

Key words： 8367; 904L; 316L; critical pitting temperature; pitting potential; corrosion rate

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