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

doi:10.3969/j.issn.1008-0198.2022.06.005

Hunan Electric Power ›› 2022, Vol. 42 ›› Issue (6): 27-31.doi: 10.3969/j.issn.1008-0198.2022.06.005

• Researches and Tests • Previous Articles Next Articles

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

Abstract

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

CLC Number:

TG172.8

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

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