换流站阀冷系统中丙二醇防冻液的腐蚀特性研究

doi:10.11902/1005.4537.2021.111

中国腐蚀与防护学报

2022, Vol. 42

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

研究报告

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换流站阀冷系统中丙二醇防冻液的腐蚀特性研究

黄赵鑫, 朱志平(

), 周攀, 江源康, 贺明鹏, 王正刚

长沙理工大学化学与食品工程学院电力与交通材料保护湖南省重点试验室长沙 410114

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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摘要:

在模拟阀冷系统实际运行温度50 ℃、通10 mA直流电流条件下进行了6063铝合金试样的浸泡腐蚀实验，通过电化学测试、试样失重以及金属表面形貌特征分析 (SEM、EDS、XRD、AFM)，研究了泄漏电流、乙二醇与丙二醇2种防冻液 (典型浓度为20%) 对6063铝合金的腐蚀特性。结果表明：6063铝合金在乙二醇和丙二醇溶液中腐蚀规律相似，随浸泡时间增加，腐蚀速率均是先平缓后快速增加，但6063铝合金在丙二醇溶液中腐蚀速率更小；电化学分析结果显示随着浸泡时间增加其界面电容值不断增加，极化电阻逐渐减小、自腐蚀电流密度不断增加，但6063铝合金在丙二醇中的自腐蚀电流密度始终小于乙二醇的；SEM显示在2种防冻液中的试样表面存在明显点蚀坑，不过其数量与分布在丙二醇中明显较少，EDS表明腐蚀产物中含有大量的Al、O以及少量的C，说明2种防冻液及其对应的氧化产物参与铝合金的腐蚀过程；AFM结果表明，6063铝合金在丙二醇中形成的腐蚀产物膜更加致密，耐腐蚀性更强，与SEM结果一致。由上可知，毒性更低的丙二醇比乙二醇对阀冷系统设备的腐蚀性更低，可以作为阀冷系统的备选防冻液。

关键词 ：阀冷系统, 6063铝合金, 乙二醇, 丙二醇, 腐蚀特性

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

收稿日期: 2021-05-18

ZTFLH:

TG174

基金资助:国网浙江省电力有限公司科研项目(5211DS160023)

通讯作者: 朱志平 E-mail: zzp8389@163.com

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

作者简介: 黄赵鑫，男，1995年生，硕士生

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引用本文:

黄赵鑫, 朱志平, 周攀, 江源康, 贺明鹏, 王正刚. 换流站阀冷系统中丙二醇防冻液的腐蚀特性研究[J]. 中国腐蚀与防护学报, 2022, 42(3): 471-478.
Zhaoxin HUANG, Zhiping ZHU, Pan ZHOU, Yuankang JIANG, Mingpeng HE, Zhenggang WANG. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.111 或 https://www.jcscp.org/CN/Y2022/V42/I3/471

图1 通10 mA直流电流下6063铝合金在不同防冻液中的腐蚀速率

图2 6063铝合金在在乙二醇溶液和丙二醇溶液中腐蚀40 d后的红外光谱图

图3 腐蚀10、20和30 d后乙二醇溶液 (20%) 中的铝离子含量检测结果

图4 6063铝合金在乙二醇和丙二醇溶液中的极化曲线

表1 6063铝合金在乙二醇和丙二醇溶液中的极化曲线参数

图5 6063铝合金在乙二醇和丙二醇溶液中的电化学阻抗谱

图6 6063铝合金在腐蚀介质中的等效电路图

表2 6063铝合金在乙二醇和丙二醇溶液中的EIS拟合结果

图7 6063铝合金在乙二醇溶液和丙二醇溶液中浸泡40 d后的SEM像与EDS图谱

图8 6063铝合金在乙二醇溶液和丙二醇溶液中浸泡40 d后的腐蚀产物膜的力曲线

图9 6063铝合金在乙二醇溶液和丙二醇溶液中浸泡30和40 d后的表面形貌

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