环境变量对核电汽轮机转子钢焊接接头电偶腐蚀性能的影响

doi:10.11902/1005.4537.2020.079

中国腐蚀与防护学报

2021, Vol. 41

Issue (3): 318-326 DOI: 10.11902/1005.4537.2020.079

研究报告

本期目录 | 过刊浏览

环境变量对核电汽轮机转子钢焊接接头电偶腐蚀性能的影响

苍雨¹, 黄毓晖¹(

), 翁硕², 轩福贞¹

^1.华东理工大学承压系统与安全教育部重点实验室上海 200237
^2.上海理工大学机械工程学院上海 200093

Effect of Environmental Variables on Galvanic Corrosion Performance of Welded Joint of Nuclear Steam Turbine Rotor

CANG Yu¹, HUANG Yuhui¹(

), WENG Shuo², XUAN Fuzhen¹

^1.East China University of Science and Technology，Key Laboratory of Pressure System and Safety of Ministry of Education，Shanghai 200237, China
^2.University of Shanghai for Science and Technology，Shanghai 200093，China

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摘要:

采用动电位极化曲线和电化学阻抗谱等测量方法，研究了Cl^-浓度、溶解氧含量以及pH对核电汽轮机25Cr2Ni2MoV转子钢焊接接头电偶腐蚀性能的影响。结果表明：在不同环境变量下，转子钢焊接接头均存在一定程度的电偶腐蚀效应，Cl^-浓度的增大显著地增强了焊接接头的电偶腐蚀效应，而溶解氧含量的升高却降低了焊接接头的电偶腐蚀效应，但是酸性条件下pH变化对电偶腐蚀效应的影响并不明显。

关键词 ：焊接接头, 电偶腐蚀, 动电位极化, 电化学阻抗谱

Abstract：

The effect of chloride ion concentration, dissolved oxygen (DO) concentration and pH value of the water on the galvanic corrosion performance of the weld joint of 25Cr2Ni2MoV steel used for nuclear steam turbine rotor were investigated by means of potentiodynamic polarization measurements and electrochemical impedance spectroscopy. The results reveal that under different environmental variables selected, the welded joints of rotor steel exhibit a certain degree of galvanic corrosion effect, in which weld metal (WM) is preferentially corroded as the anode, and the corrosion resistance of WM and base metal (BM) decreases with the increasing chloride ion concentration, increasing dissolved oxygen content and decreasing pH value. In the environment of low chloride ion concentration (0.035 and 35 mg/L), the electrode process of WM and BM is controlled by ion diffusion, while in other environments, the electrode process is controlled by electrochemical activation. In addition, the increase of chloride ion concentration significantly enhances the galvanic corrosion effect of welded joints. The increase of dissolved oxygen concentration reduces the galvanic corrosion effect of welded joints, while the change of pH value under acidic conditions has no obvious effect on galvanic corrosion effects.

Key words： welded joint galvanic corrosion potentiodynamic polarization electrochemical impedance spectroscopy

收稿日期: 2020-05-11

ZTFLH:

TG174

基金资助:国家自然科学基金(51875202)

通讯作者: 黄毓晖 E-mail: yhhuang@ecust.edu.cn

Corresponding author: HUANG Yuhui E-mail: yhhuang@ecust.edu.cn

作者简介: 苍雨，男，1995年生，硕士生

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引用本文:

苍雨, 黄毓晖, 翁硕, 轩福贞. 环境变量对核电汽轮机转子钢焊接接头电偶腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2021, 41(3): 318-326.
Yu CANG, Yuhui HUANG, Shuo WENG, Fuzhen XUAN. Effect of Environmental Variables on Galvanic Corrosion Performance of Welded Joint of Nuclear Steam Turbine Rotor. Journal of Chinese Society for Corrosion and protection, 2021, 41(3): 318-326.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.079 或 https://www.jcscp.org/CN/Y2021/V41/I3/318

表1 25Cr2Ni2MoV转子钢母材及焊缝材料的化学成分

图1 不同Cl-浓度下母材和焊缝区域的极化曲线，自腐蚀电位和自腐蚀电流密度

图2 不同Cl-浓度下母材和焊缝的Nyquist曲线及等效电路

表2 不同Cl-浓度下母材和焊缝区域基于等效电路拟合的阻抗参数

图3 不同溶解氧含量下母材和焊缝区域的极化曲线，自腐蚀电位与自腐蚀电流密度

图4 不同溶解氧含量下母材和焊缝区域的Nyquist曲线

表3 不同溶解氧含量条件下母材和焊缝区域基于等效电路拟合的阻抗参数

图5 不同pH值条件下母材和焊缝区域的极化曲线，自腐蚀电位与自腐蚀电流密度

图6 不同pH下母材和焊缝区域的Nyquist曲线

表4 不同pH下母材区域基于等效电路拟合的阻抗参数

图7 不同环境变量条件下接头区域的极化曲线

表5 不同Cl-浓度下焊缝和接头区域的自腐蚀电流密度以及偶合后的电偶效应

表6 不同溶解氧含量下焊缝和接头区域的自腐蚀电流密度以及偶合后的电偶效应

表7 不同pH下焊缝和接头区域的自腐蚀电流密度以及偶合后的电偶效应

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