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Open AccessArticle

Erosion Corrosion Behavior of Aluminum in Flowing Deionized Water at Various Temperatures

1
Tianshengqiao Bureau, Extra High Voltage Power Transmission Company, China Southern Power Grid (CSG), Xingyi 562400, China
2
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
3
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 779; https://doi.org/10.3390/ma13030779
Received: 12 January 2020 / Revised: 26 January 2020 / Accepted: 5 February 2020 / Published: 8 February 2020
(This article belongs to the Special Issue Corrosion and Corrosion Protection for Light Metals/Alloys)
To optimize the operating temperature and flow velocity of cooling water in a high voltage direct current (HVDC) thyristor valve cooling system, the erosion corrosion characteristics of aluminum electrodes in deionized water at various temperatures were studied. With increasing water temperature, the corrosion current of the aluminum electrode gradually increases and the charge transfer impedance gradually decreases, thus, the corrosion of aluminum tends to become serious. The aluminum electrode in 50 °C deionized water has the most negative corrosion potential (−0.930 V), the maximum corrosion current (1.115 × 10−6 A cm−2) and the minimum charge transfer impedance (8.828 × 10−6 Ω), thus, the aluminum corrosion at this temperature is the most serious. When the temperature of deionized water increases, the thermodynamic activity of the ions and dissolved oxygen in the deionized water increases, and the mass transfer process accelerates. Therefore, the electrochemical corrosion reaction of the aluminum surface will be accelerated. The corrosion products covering the aluminum electrode surface are mainly Al(OH)3. With increasing water temperature, the number of pits and grooves formed by corrosion on the aluminum surface increased. In this paper, the molar activation energy Ea and the equilibrium constant K of the aluminum corrosion reaction with various temperatures are calculated. This clarifies the effect of temperature on the aluminum corrosion reaction, which provides a basis for protecting aluminum from corrosion. The results of this study will contribute to research that is focused on the improvement of production techniques used for HVDC thyristor valve cooling systems. View Full-Text
Keywords: molar activation energy; equilibrium constant; aluminum; erosion corrosion; deionized water; radiator; high voltage direct current molar activation energy; equilibrium constant; aluminum; erosion corrosion; deionized water; radiator; high voltage direct current
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MDPI and ACS Style

Hao, L.; Zheng, F.; Chen, X.; Li, J.; Wang, S.; Fan, Y. Erosion Corrosion Behavior of Aluminum in Flowing Deionized Water at Various Temperatures. Materials 2020, 13, 779.

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