Corrosion Characteristics of Propylene Glycol Antifreeze in Valve Cooling System of Converter Station

doi:10.11902/1005.4537.2021.111

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 471-478 DOI: 10.11902/1005.4537.2021.111

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Corrosion Characteristics of Propylene Glycol Antifreeze in Valve Cooling System of Converter Station

HUANG Zhaoxin, ZHU Zhiping(

), ZHOU Pan, JIANG Yuankang, HE Mingpeng, WANG Zhenggang

Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China

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Abstract

The corrosion behavior of 6063 Al-alloy in ethylene glycol and propylene glycol antifreeze (typical concentration is 20%) in the simulated operating conditions of the valve cooling system i.e., at 50 ℃ by applied 10 mA DC current, was comparatively studied by means of immersion test with mass loss measurement and electrochemical test, as well as SEM with EDS, XRD and AFM. The results showed that: the corrosion behavior of 6063 Al-alloy in ethylene glycol solution and propylene glycol solution was comparable. The corrosion rate of 6063 Al-alloy increased slowly and then rapidly with the increase of immersion time. The overall corrosion rate of 6063 Al-alloy in propylene glycol was lower than that in ethylene glycol. Electrochemical analysis results showed that with the increased of immersion time, the interface capacitance increased, the polarization resistance decreased and the free-corrosion current density increased, but the free-corrosion current density of 6063 Al-alloy in propylene glycol was always lower than that of ethylene glycol. SEM observation revealed that there were obvious pits on the surface of the samples in the two antifreeze solutions, but the number of pits was significantly less in the propylene glycol. EDS results showed that the corrosion products composed mainly of Al and O with a little C, indicating that the two antifreeze solutions and their corresponding oxidation products were involved in the corrosion process of Al-alloy. The results of AFM showed that the corrosion product film on 6063 Al-alloy formed in propylene glycol was much compact with higher corrosion resistance, which was consistent with the results of SEM. In summary, propylene glycol with lower toxicity was less corrosive than ethylene glycol, so that could be used as an alternative antifreeze for valve cooling system.

Key words: valve cooling system 6063 Al-alloy ethylene glycol propylene glycol corrosion characteristics

Received: 18 May 2021

ZTFLH:

TG174

Fund: Power Science Research Institute of Zhejiang Electric Power Co., Ltd, China(5211DS160023)

Corresponding Authors: ZHU Zhiping E-mail: zzp8389@163.com

About author: ZHU Zhiping, E-mail: zzp8389@163.com

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	Zhaoxin HUANG
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Cite this article:

HUANG Zhaoxin, ZHU Zhiping, ZHOU Pan, JIANG Yuankang, HE Mingpeng, WANG Zhenggang. Corrosion Characteristics of Propylene Glycol Antifreeze in Valve Cooling System of Converter Station. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 471-478.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2021.111 OR https://www.jcscp.org/EN/Y2022/V42/I3/471

Fig.1 Corrosion rates of 6063 Al-alloy in the different antifreeze solutions at 10 mA DC current

Fig.2 Infrared spectra of 6063 Al-alloy after corrosion for 40 d in ethylene glycol solution and propylene glycol solution

Fig.3 Contents of aluminum ions in ethylene glycol solution (20%) after tests for 10, 20 and 30 d

Fig.4 Polarization curves of 6063 Al-based alloy in ethy-lene glycol (a) and propylene glycol (b) solutions

Table 1 Polarization curve parameters of 6063 Al-based alloy in ethylene glycol and propylene glycol solutions

Fig.5 Electrochemical impedance spectroscopies of 6063 Al-alloy in inethylene glycol (a) and propylene glycol (b) solutions

Fig.6 Equivalent circuit for fitting EIS results

Table 2 Fitting parameters of EIS of 6063 Al-based alloy in inethylene glycol and propylene glycol solutions

Fig.7 SEM images (a~f) and EDS results (g, h) of 6063 Al-alloy immersed for 40 d in ethylene glycol and propylene glycol solutions

Fig.8 Force curves of the corrosion product films formed on 6063 Al-alloy after immersion for 40 d in ethylene glycol (a) and propylene glycol (b) solutions

Fig.9 Surface images of 6063 Al-alloy immersed in ethylene glycol (a, b) and propylene glycol (c, d) solutions for 30 d (a, c) and 40 d (b, d)

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