乙酸对2Cr12MoV钢在初凝水中腐蚀的影响

doi:10.3969/j.issn.1008-0198.2022.06.005

湖南电力 ›› 2022, Vol. 42 ›› Issue (6): 27-31.doi: 10.3969/j.issn.1008-0198.2022.06.005

乙酸对2Cr12MoV钢在初凝水中腐蚀的影响

周柏青¹, 魏加强^2,3,4, 文一章⁵, 万涛², 刘凯^2,4, 龚尚昆², 查方林^2,4

1.武汉大学动力与机械学院, 湖北武汉 430072;
2.国网湖南省电力有限公司电力科学研究院, 湖南长沙 410007;
3.湖南省湘电试验研究院有限公司, 湖南长沙 410004;
4.高效清洁发电技术湖南省重点实验室,湖南长沙 410007;
5.湖南大学电气与信息工程学院, 湖南长沙 410082

收稿日期:2022-08-15 修回日期:2022-09-23 出版日期:2022-12-25 发布日期:2023-01-13
作者简介:周柏青(1958),男,教授,从事电厂化学研究工作。
基金资助:
国网湖南省电力有限公司科研项目(5216A521N006)

Effect of Acetic Acid on Corrosion Behavior of 2Cr12MoV Steel in Early Condensates

ZHOU Baiqing¹, WEI Jiaqiang^2,3,4, WEN Yizhang⁵, WAN Tao², LIU Kai^2,4, GONG Shangkun², ZHA Fanglin^2,4

1. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China;
2. State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007, China;
3. Hunan Xiangdian Test and Research Institute Co., Ltd., Changsha 410004, China;
4. Hunan Province Key Laboratory of High Efficient & Clean Thermal Power Technology, Changsha 410007, China;
5. College of electrical and information engineering, Hunan University, Changsha 410082, China

Received:2022-08-15 Revised:2022-09-23 Online:2022-12-25 Published:2023-01-13

摘要/Abstract

摘要： 针对汽轮机低压缸相变区腐蚀问题,通过失重法、SEM表面形貌分析法、拉曼光谱分析法和动电位极化测试等方法研究了乙酸(HAc)对2Cr12MoV钢在初凝水中腐蚀的影响,以揭示乙酸对汽轮机低压缸腐蚀的影响。实验结果表明,2Cr12MoV钢在HAc溶液中的腐蚀机理为缓冲作用机理,乙酸不直接参与阴极还原反应,而通过电离不断提供H⁺加速阴极反应。2Cr12MoV钢腐蚀速度随乙酸质量浓度增大而加快,2Cr12MoV钢在100 mg/L HAc初凝水溶液中的腐蚀速度在浸泡初期快速降低,120 h之后稳定在0.012 mm/a左右。

关键词: 乙酸, 腐蚀, 初凝水, 低压缸叶片

Abstract: Aiming at the corrosion problem in the phase change zone of low pressure cylinder of steam turbine, the effect of acetic acid (HAC) on the corrosion of 2Cr12MoV steel in primary setting water is studied by means of weight loss,SEM surface topography analysis, raman spectroscopy analysis and potentiodynamic polarization test, to reveal the effect of acetic acid on the corrosion of low pressure cylinder of steam turbine. The experimental results show that the corrosion mechanism of 2Cr12MoV steel in HAC solution is a buffering mechanism, acetic acid does not directly participate in the cathodic reduction reaction, but continuously provides H⁺ to accelerate cathodic reaction by ionization.The corrosion rate of 2Cr12MoV steel increases with the increase of acetic acid concentration,the corrosion rate of 2Cr12MoV steel in 100 mg/L HAC solution decreases rapidly at the beginning of soaking and it was stable at about 0.012 mm/a after 120 h.

Key words: acetic acid, corrosion, early condensate, blade steel

中图分类号:

TG172.8

周柏青, 魏加强, 文一章, 万涛, 刘凯, 龚尚昆, 查方林. 乙酸对2Cr12MoV钢在初凝水中腐蚀的影响[J]. 湖南电力, 2022, 42(6): 27-31.

ZHOU Baiqing, WEI Jiaqiang, WEN Yizhang, WAN Tao, LIU Kai, GONG Shangkun, ZHA Fanglin. Effect of Acetic Acid on Corrosion Behavior of 2Cr12MoV Steel in Early Condensates[J]. Hunan Electric Power, 2022, 42(6): 27-31.

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乙酸对2Cr12MoV钢在初凝水中腐蚀的影响

Effect of Acetic Acid on Corrosion Behavior of 2Cr12MoV Steel in Early Condensates

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