铝在高压直流输电系统中高电压高温下的腐蚀行为研究

doi:10.16085/j.issn.1000-6613.2016.s2.015

化工进展 ›› 2016, Vol. 35 ›› Issue (S2): 92-98.DOI: 10.16085/j.issn.1000-6613.2016.s2.015

铝在高压直流输电系统中高电压高温下的腐蚀行为研究

李道豫, 邱志远, 李学武, 冯文昕, 周培

中国南方电网有限责任公司超高压输电公司贵阳局, 贵州贵阳 550003

收稿日期:2016-09-27 修回日期:2016-09-28 出版日期:2016-12-31 发布日期:2016-12-22
通讯作者: 李道豫(1983-),男,高级工程师。E-mail:575182694@qq.com。

Corrosion behavior of aluminum at high potential and high temperature in HVDC systems

LI Daoyu, QIU Zhiyuan, LI Xuewu, FENG Wenxin, ZHOU Pei

Guiyang Bureau, EHV Power Transmission Company of China Southern Power Grid, Guiyang 550003, Guizhou, China

Received:2016-09-27 Revised:2016-09-28 Online:2016-12-31 Published:2016-12-22

摘要/Abstract

摘要： 高压直流输电换流阀的内冷水系统中，铝散热器在高压高温下会腐蚀进而引起均压电极发生氢氧化铝结垢，导致生产异常。此状态下的铝的腐蚀行为少有报道。本文研究了与散热器相同材质的铝电极在高电压、高温下于蒸馏水和弱碱性溶液中的腐蚀行为及其电化学反应规律。理清了铝的电化学腐蚀行为，建立铝在中性溶液中失去电子的反应的模型。建立了铝电极的腐蚀反应的等效电路，计算了各历程的阻抗，发现腐蚀的控制步骤为OH^-穿过沉淀层。研究表明，在3.35mmol/L氨水溶液中具有最低的腐蚀趋势，其腐蚀电位为-0.731 V，腐蚀电流密度为7.667×10^-7 A/cm²，塔菲尔斜率为5.328。此时电化学反应的阻抗最大，其腐蚀速度最低。铝电极表面会覆盖氢氧化铝等腐蚀产物，其限制离子的扩散，减缓腐蚀趋势。由此建议在保证低电导率的前提下调整内冷水的pH，来改善换流阀内冷水系统的防腐能力。

关键词: 高电压, 铝, 腐蚀行为

Abstract: The corrosion behavior of aluminum at high potential difference in alkaline solution was studied,focusing on the electrodes in the cooling water system inside the high-voltage direct current thyristor valve.It is clear that the corrosion behavior of aluminum at high potential difference and high temperature differs from that in normal conditions.The corrosion process and the model of electrode surface corrosion are proposed.This study found that the passage of OH^- through the layer of precipitation controls the corrosion of aluminum near pH 7.The aluminum electrode surface became covered with corrosion products,which reduced further corrosion.The aluminum electrode had the lowest rate of corrosion in alkalescent solution with an ammonia concentration of 3.35mmol/L.This can be used as a theoretical basis for the design of anti-corrosion technology.That adjusting the pH value of the cold water would slow the corrosion rate of aluminum,thereby providing a corrosion control measure.

Key words: high potential, aluminum, corrosion behavior

中图分类号:

TQ050.9

李道豫, 邱志远, 李学武, 冯文昕, 周培. 铝在高压直流输电系统中高电压高温下的腐蚀行为研究[J]. 化工进展, 2016, 35(S2): 92-98.

LI Daoyu, QIU Zhiyuan, LI Xuewu, FENG Wenxin, ZHOU Pei. Corrosion behavior of aluminum at high potential and high temperature in HVDC systems[J]. Chemical Industry and Engineering Progree, 2016, 35(S2): 92-98.

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铝在高压直流输电系统中高电压高温下的腐蚀行为研究

Corrosion behavior of aluminum at high potential and high temperature in HVDC systems

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