干/湿NaCl盐雾条件下钢芯铝绞(ACSR)导线腐蚀层结构及腐蚀机理
Microstructure and Corrosion Mechanism of ACSR Conductor in Dry/Wet NaCl Salt Atmosphere
摘 要
采用干/湿NaCl盐雾试验,研究了钢芯铝绞(ACSR)导线腐蚀产物的相组成、腐蚀层结构及其腐蚀机理.结果表明:ACSR导线的腐蚀是氧化膜的局部破坏(形成麻点和缺口)及线股间电化学腐蚀等共同作用的结果.ACSR导线腐蚀产物组成复杂,主要包括锌及铝的氢氧化物及碱式氯化物盐.内外层Al股线及钢芯线表面镀锌层开始生成局部的麻点,然后形成连续的腐蚀层,腐蚀层内层致密而外层疏松.在腐蚀前期(≤168 h),外层铝股线的腐蚀速率大于内层铝股线,在腐蚀后期,内层铝股线的腐蚀速率更大.镀锌层的腐蚀速率最大,480 h腐蚀后完全被破坏,逐渐失去对钢芯线的保护作用.
盐雾试验
显微结构
腐蚀机理
ACSR conductor
salt spray test
microstructure
corrosion mechanism
Abstract
Dry/wet NaCl salt spray experiment was employed to study the phase composition of corrosion products,microstructure of corrosion layers and corrosion mechanism of the aluminium conductor steel reinforced (ACSR).The results showed that the corrosion of the ACSR conductor was a combined mechanisms of pitting corrosion,crevice corrosion,galvanic corrosion and etc.The phase composition of the corrosion layer was complicated and mainly included hydroxides and basic chlorides of Zn and Al.The pits appeared firstly and then continuous corrosion layers formed around the Al strands and the galvanized Zn layer.The corrosion layers were non-uniform and generally composed of dense inner layers and porous outer layers.In the early stage of the corrosion (≤168 h),the corrosion of the external Al strands was stronger than that of the internal,however,it reversed in the later stage (>168 h).The corrosion rate of the galvanized Zn layer was the most intense.After 480 h,the galvanized Zn layer was completely destroyed and gradually lost the protection effet to the steel core strands.
中图分类号 TM752 TG171
所属栏目 试验研究
基金项目 国家电网科技攻关项目(2009144)
收稿日期 2009/11/19
修改稿日期 2009/12/5
网络出版日期
作者单位点击查看
备注汤文明,教授.
引用该论文: ZHANG Jian-kun,CHEN Guo-hong,WANG Jia-qing,ZHANG Tao,XU Guang-qing,TANG Wen-ming. Microstructure and Corrosion Mechanism of ACSR Conductor in Dry/Wet NaCl Salt Atmosphere[J]. Corrosion & Protection, 2010, 31(8): 581～586
被引情况:
【1】王伟,朱成丽,吴洪亮,李晓红, "耐张线夹内钢芯铝绞线断裂原因及断口特征",腐蚀与防护 35, 297-301(2014)
【2】朱成丽,李晓红,吴洪亮,叶建锋, "输电线路压接金具错位型缺陷引发的失效及其仿真研究",腐蚀与防护 36, 373-377(2015)
【3】陈云翔,林德源,洪毅成,江祖瑄,杨九霄,邵艳群, "35kV架空输电线路钢芯铝绞线内层铝股线的腐蚀失效分析",腐蚀与防护 36, 594-598(2015)
【4】夏开全,于俊超,邓元婧,任西春, "在役输电线路钢芯铝绞线腐蚀状态评估与分析",腐蚀与防护 35, 495-499(2014)
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参考文献
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【3】Oesch S,Faller M.Environmental Effects on materials:the effect of the air pollutions SO2,NO2 and O3 on the corrosion of copper,zinc and aluminium.A short literature survey and results of laboratory exposures[J].Corrosion Science,1997,39:1505-1530.
【4】Svensson J E,Johansson L G.The temperature-dependence of the SO2 induced atmosphere corrosion of zinc[J].Corrosion Science,1996,38(2):2225-2233.
【5】Vera R,Delgado D,Rosales B M.Effect of atmospheric pollutants on the corrosion of high power electrical conductors:Part 1.aluminium and AA6201 alloy[J].Corrosion Science,2006,48:2882-2900.
【6】Elshawesh F,ElAgaili M,Elwaer A.Atmospheric corrosion of aluminium conductor[J].British Corrosion Journal,1997,32(1):77-80.
【7】屈庆,严川伟,白玮,等.SO2存在下NaCl沉积量对Zn大气腐蚀的影响[J].金属学报,2001,37(1):72-76.
【8】王凤平,陈华,李晓刚.盐粒沉降对Zn大气腐蚀的影响[J].北京科技大学学报,2002,24(4):445-448.
【9】汪长春,郑文远.220kV架空导线断股的案例分析[J].电力安全技术,2005,7(10):25-27.
【10】任华钢.环境对架空输电线路的污秽和腐蚀[J].湖南电力,1999,19(1):26-28.
【11】Lyon S B,Thompson G E,Johnson J B,et al.Accelerated atmospheric corrosion testing using a cyclic wet/dry exposure test:aluminium,galvanized steel and steel[J].Corrosion,1987,43:719-726.
【12】圆线同心绞架空导线.GB/T 1179-1999[S].国家质量技术监督局.
【13】人造气氛腐蚀试验-盐雾试验.GB/T 10125-1997[S].国家质量技术监督局.
【14】Nguyen T H,Foley R T.On the mechanism of pitting of aluminum[J].J Electrochemical Soc,1979,26(11):1855-1860.
【15】Boxley C J,Watkins J J,White H S.Al2O3 film dissolution in aqueous chloride solutions[J].Electrochemical and Solid-State Letters,2003,38-41B:6-10.
【16】Szklarska-Smialowska Z.Pitting corrosion of aluminum[J].Corrosion Science,1999,41:1743-1767.
【17】Frankel G S.Pitting corrosion of metals[J].J Electrochemical Soc,1998,145(6):2186-2198.
【18】Bhattamishra A K,Lal K,Nair G G,et al.Corrosion behaviour of overhead aluminium/alloy conductors in industrial and coastal environments[J].NML Technical Journal,2002,29(1-4):20-24.
【19】王凤平,张学元,严川伟,等.NaCl和CO2对Zn在薄液膜下腐蚀的协同作用[J].金属学报,2000,36(9):970-974.
【20】温灵长.浅谈架空输电线路的腐蚀机理及对策[J].西北电力技术,2001(4):73-76.
【21】Calitz J.Overhead conductor corrosion study[D].South Africa,Tshwane:Tshwane University of Technology Master Degree Dissertation,2004:11-14.
【22】符圣旭,靳武刚,王福恒.不同环境介质中热喷涂Al和Zn的腐蚀行为[J].腐蚀与防护,2007,28(1):6-12.
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