大直流融冰技术对钢芯铝绞线腐蚀的影响
Effects of Direct Current Ice-Melting Technique on Corrosion of Aluminum Conductor Steel Reinforced
摘 要
采用大直流电流发生器为电流源，在环境箱内模拟了镀锌钢丝的直流融冰过程，研究强直流电对镀锌钢丝腐蚀造成的影响，结合多阶网络电路计算，探讨了大直流融冰可能导致腐蚀加速的影响因素。结果表明：在接触覆冰层的钢丝正极端，出现了明显的镀锌层溶解，而在负极端，则出现了因氢气析出导致的镀锌层损伤，并且正负极腐蚀损伤均集中在端头位置，局部腐蚀加速明显，容易引发断线事故；多阶网络电路模型计算结果表明，融冰层内的支线电流不随覆冰层线路的延长而无限加强，镀锌钢丝极化电阻的减小会导致支线电流向覆冰层端部集中，加剧局部腐蚀。
钢芯铝绞线
电解腐蚀
direct current ice-melting technique
aluminum conductor steel reinforced
electrolytic corrosion
Abstract
The process of direct current (DC) ice-melting on galvanized steel wire was conducted in an environmental chamber using a large direct current generator as power source to study the influence of strong direct current on the corrosion of galvanized steel wire. Combined with the calculation of multi-step network circuit, the influencing factors of corrosion acceleration by large DC ice-melting were investigated. The results show that a significant dissolution of zinc coating occurred on the positive side of the steel wire, while the damage of zinc coating caused by hydrogen evolution was also observed on the negative side of the steel wire. In addition, the corrosion damage concentrating on the positive and negative terminals, led to severe localized corrosion, which easily caused steel wires to break. The calculation results of the multi-stage network circuit model show that the branch current in the ice-melting layer did not increase indefinitely with the extension of the ice-covered line, and the reduction of the polarization resistance of the galvanized steel wire caused the branch current to concentrate on the end of the ice layer, which aggravated localized corrosion.
中图分类号 TQ172 DOI 10.11973/fsyfh-201910002
所属栏目 试验研究
基金项目 贵州省电力试验研究院研究项目（2016030304JS208）；国家自然科学基金（51461007）；贵州省科技厅人才团队项目（20175656）；贵州省教育厅创新群体项目（2016021）
收稿日期 2017/11/30
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联系人作者石维(wshi@gzu.edu.cn)
引用该论文: DAI Faming,JIANG Xin,ZHANG Renqi,WANG Lingxu,YANG Zaigui,FAN Lei,HE Jinghang,SHI Wei,LIANG Yu. Effects of Direct Current Ice-Melting Technique on Corrosion of Aluminum Conductor Steel Reinforced[J]. Corrosion & Protection, 2019, 40(10): 710
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【3】刘秀玉, 苗帅, 詹成伟, 等. 钢芯铝绞线中的电偶腐蚀行为[J]. 材料保护, 2010, 43(7):53-54.
【4】夏开全, 于俊超, 邓元婧, 等. 在役输电线路钢芯铝绞线腐蚀状态评估与分析[J]. 腐蚀与防护, 2014, 35(5):495-499.
【5】陈云翔, 林德源, 洪毅成, 等. 35 kV架空输电线路钢芯铝绞线内层铝股线的腐蚀失效分析[J]. 腐蚀与防护, 2015, 36(6):594-598.
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【7】岳增武, 李辛庚, 闫风洁, 等. 沿海地区架空钢芯铝绞线的腐蚀[J]. 电线电缆, 2015(1):36-38, 43.
【8】闫军, 夏洪刚, 梁志福, 等. 恶劣大气环境下220 kV变电站钢芯铝绞线腐蚀断裂分析[J]. 内蒙古电力技术, 2013, 31(2):27-30.
【9】安宁. 大气环境下输电线路导线腐蚀与防护的研究[D]. 保定:华北电力大学, 2014.
【10】刘文涛, 和识之, 陈亦平, 等. 基于直流融冰的电网大面积冰灾防御策略[J]. 电力系统自动化, 2012, 36(11):102-107.
【11】DONG Z H, GUO X P, ZHENG J X,et al. Investigation on inhibition of Cr4O2- and Mo4O2- ions on carbon steel pitting corrosion by electrochemical noise analysis[J]. Journal of Applied Electrochemistry, 2002, 32(4):395-400.
【12】李明东, 冯杰, 毛健, 等. 钢芯线镀Zn层对钢芯铝绞线腐蚀行为的影响[J]. 广州化工, 2015, 43(17):85-88.
【13】SALGUEIRO AZEVEDO M, ALLÉLY C, OGLE K, et al. Corrosion mechanisms of Zn(Mg, Al) coated steel:2. The effect of Mg and Al alloying on the formation and properties of corrosion products in different electrolytes[J]. Corrosion Science, 2015, 90:482-490.
【14】GHODS P, ISGOR O B, MCRAE G A, et al. Electrochemical investigation of chloride-induced depassivation of black steel rebar under simulated service conditions[J]. Corrosion Science, 2010, 52(5):1649-1659.
【15】CASTANEDA H, SOSA E, ESPINOSA-MEDINA M A. Film properties and stability influence on impedance distribution during the dissolution process of low-carbon steel exposed to modified alkaline sour environment[J]. Corrosion Science, 2009, 51(4):799-806.
【16】POUPARD O, AT-MOKHTAR A, DUMARGUE P. Corrosion by chlorides in reinforced concrete:Determination of chloride concentration threshold by impedance spectroscopy[J]. Cement and Concrete Research, 2004, 34(6):991-1000.
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