304和316L不锈钢的高温电化学腐蚀行为

上海交通大学学报（自然版） ›› 2016, Vol. 50 ›› Issue (02): 215-221.

304和316L不锈钢的高温电化学腐蚀行为

段振刚1，杜东海1，张乐福1，孟凡江2，石秀强2

（1．上海交通大学核能科学与工程学院，上海 200240； 2.上海核工程研究设计院，上海 200233）

收稿日期:2014-12-22 出版日期:2016-02-29 发布日期:2016-02-29
基金资助:
压水堆核电材料环境相容性研究项目(2011ZX060040090601)资助

Electrochemical Investigation of Corrosion Behavior of 304 and 316L Stainless Steels in HighTemperature Water

DUAN Zhengang1,DU Donghai1,ZHANG Lefu1,MENG Fanjiang2,SHI Xiuqiang2

（1. School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Shanghai Nuclear Engineering Research and Design Institute, Shanghai 200233, China)

Received:2014-12-22 Online:2016-02-29 Published:2016-02-29

摘要/Abstract

摘要： 摘要：通过模拟压水堆一回路水环境，研究了溶液温度和溶氧量（DO）对304和316L不锈钢高温电化学腐蚀行为的影响.结果表明：随着溶液温度升高，在304和316L不锈钢表面所形成的氧化膜的保护性能降低；随着DO升高，304和316L不锈钢的自腐蚀电位升高，自腐蚀电流密度降低，钝化区缩小；304和316L不锈钢表面形成了双层氧化膜，外层氧化膜颗粒尺寸和颗粒间隙随着温度的升高而增大，随着DO增加而减小；在所用实验条件下，316L不锈钢表现出比304更优异的抗腐蚀性能.

关键词: 不锈钢, 压水堆, 高温, 电化学行为, 腐蚀性能

Abstract: Abstract： The effects of temperature and dissolved oxygen (DO) on electrochemical behaviors and the oxide films formed on type 304 and 316L stainless steels in primary water in simulated pressured water reactor (PWR) were investigated by means of potentiodynamic polarization measurements, scanning electron microscope (SEM) observation and energy dispersive Xray spectrum (EDS). The results revealled that the passivity of the oxide films degraded with increasing solution temperature. The corrosion potential (Ecorr) shifted to positive direction while corrosion current density (Jcorr) decreased significantly with the increase of DO. The oxide films formed on 304 and 316L stainless steels showed a doublelayer characteristic, and the size of oxide particles and the space between oxide particles on outer layer increased with increasing temperature but decreased with increasing DO. The type 316L stainless steels exhibited superior corrosion resistant characteristics than 304 SS in all investigated conditions.

Key words: Key words： stainless steel, pressured water reactor (PWR), hightemperature, electrochemistry behavior, corrosion behavior

中图分类号:

O 646

段振刚1，杜东海1，张乐福1，孟凡江2，石秀强2. 304和316L不锈钢的高温电化学腐蚀行为[J]. 上海交通大学学报（自然版）, 2016, 50(02): 215-221.

DUAN Zhengang1,DU Donghai1,ZHANG Lefu1,MENG Fanjiang2,SHI Xiuqiang2. Electrochemical Investigation of Corrosion Behavior of 304 and 316L Stainless Steels in HighTemperature Water [J]. Journal of Shanghai Jiaotong University, 2016, 50(02): 215-221.

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