两种不锈钢在模拟重水堆一回路溶液和3.5%NaCl溶液中的点蚀行为

doi:10.11902/1005.4537.2020.252

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 653-658 DOI: 10.11902/1005.4537.2020.252

研究报告

本期目录 | 过刊浏览

两种不锈钢在模拟重水堆一回路溶液和3.5%NaCl溶液中的点蚀行为

纪开强¹, 李光福¹(

), 赵亮²

^1.上海材料研究所上海市工程材料应用与评价重点实验室上海 200437
^2.中核集团中核核电运行管理有限公司海盐 314300

Pitting Behavior of Two Stainless Steels in Simulated Heavy Water Reactor Primary Solution and 3.5%NaCl Solution

JI Kaiqiang¹, LI Guangfu¹(

), ZHAO Liang²

^1.Shanghai Key Lab of Engineering Materials Application and Evaluation，Shanghai Research Institute of Materials, Shanghai 200437, China
^2.China National Nuclear Power Operation Management Co. Ltd. , Haiyan 314300, China

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摘要:

采用电化学方法研究了重水堆核电站一回路引漏管线用304L和316L不锈钢在多种环境中的点蚀行为，包括在30和60 ℃模拟重水堆一回路溶液和3.5%NaCl溶液中的点蚀电位、阳极极化曲线和临界点蚀温度 (CPT)。对比分析了温度、溶液和材料因素对材料腐蚀行为的影响。结果表明：模拟溶液中材料的点蚀电位和CPT均高于3.5%NaCl溶液中的，材料的点蚀敏感性随着Cl^-浓度的增加而升高；对比可见，相同环境下316L不锈钢的点蚀电位和CPT均高于304L不锈钢的，316L不锈钢具有更优异的点蚀抗力；当实验温度由30 ℃提升至60 ℃时，两种溶液中材料的点蚀敏感性均明显升高。根据实验结果讨论了工程上防治相关腐蚀失效的方法。

关键词 ：重水堆, 一回路, 不锈钢, 点蚀

Abstract：

The pitting corrosion behavior of stainless steels 304L and 316L, as the structural material used for heavy water collection tubing of nuclear power plant, in simulated primary solution of heavy water reactor and 3.5%NaCl solution at 30 and 60 ℃ was studied by means of electrochemical methods, such as measurements of pitting potential, anodic polarization curve and critical pitting temperature (CPT) etc. The effect of temperature, solution- and material-parameters on the corrosion behavior of the two steels was comparatively examined. The results showed that the pitting potential and CPT of the two steels in the simulated solution were higher than that in 3.5%NaCl solution, and the pitting sensitivity of the steels in the simulated solutions increased with the increase of chloride ion concentration. It was found that the pitting potential and CPT of 316L stainless steel were higher than those of 304L stainless steel in the same environment, thus 316L stainless steel had better pitting resistance. When the test temperature was increased from 30 ℃ to 60 ℃, the pitting sensitivity of the steels in both solutions increased significantly. According to the test results, the methods related with the prevention from corrosion failures in engineering practice are discussed.

Key words： heavy water reactor primary circuit stainless steel pitting

收稿日期: 2020-12-04

ZTFLH:

TG174

通讯作者: 李光福 E-mail: guangfuli8298@vip.sina.com

Corresponding author: LI Guangfu E-mail: guangfuli8298@vip.sina.com

作者简介: 纪开强，男，1994年生，硕士，工程师

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纪开强, 李光福, 赵亮. 两种不锈钢在模拟重水堆一回路溶液和3.5%NaCl溶液中的点蚀行为[J]. 中国腐蚀与防护学报, 2021, 41(5): 653-658.
Kaiqiang JI, Guangfu LI, Liang ZHAO. Pitting Behavior of Two Stainless Steels in Simulated Heavy Water Reactor Primary Solution and 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 653-658.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.252 或 https://www.jcscp.org/CN/Y2021/V41/I5/653

表1 实验用材料的化学成分

图1 两种材料在30和60 ℃ 3.5%NaCl和模拟溶液溶液中的阳极极化曲线

Parameter	E_b10( $E ¯$ _b10)		E_b100( $E ¯$ _b100)		E_p( $E ¯$ _p)
Parameter	30 ℃	60 ℃	30 ℃	60 ℃	30 ℃	60 ℃
304L stainless steel simulated	677, 665, 666 (669)	523, 427, 537 (495)	756,714,766 (745)	603,546,628 (592)	---	---
304L stainless steel 3.5%NaCl	256, 287, 226 (256)	88, 113, 100 (100)	259,289,268 (272)	92,114,102 (102)	---	---
316L stainless steel simulated	684, 728, 752 (721)	568, 615, 564 (582)	757,796,859 (804)	647,665,612 (641)	82, 143, -8 (73)	-105, -28, 45 (-29)
316L stainless steel 3.5%NaCl	340, 355, 303 (332)	174, 174, 96 (148)	363,382,349 (364)	175,176,106 (152)	50, 60, 36 (48)	-89, -114, -71 (-91)

表2 两种材料分别在30和60 ℃模拟溶液和3.5%NaCl溶液中点蚀实验结果 (括号内为平均值)

表3 两种不锈钢的CPT实验结果

图2 两种不锈钢在3.5%NaCl溶液和模拟溶液中的CPT实验结果

图3 两种不锈钢在30 ℃的3.5%NaCl溶液和模拟溶液中点蚀形貌

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