Stray Current Corrosion of Q235 Steel in Hainan Soil
摘 要
采用扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)等技术观察和分析了交、直流杂散电流干扰下Q235钢在海南土壤中的腐蚀形貌和腐蚀产物,并对腐蚀过程的电化学参数进行了测量。结果表明:杂散电流腐蚀具有明显的电解腐蚀特征,电流流入金属构件部位成为阴极而受到保护,电流流出金属构件部位成为阳极而受到腐蚀;交、直流杂散电流腐蚀具有集中腐蚀特征,腐蚀产物呈絮状,产物层均有明显裂纹、分层、脱落现象,对基体不具有保护作用;交、直流腐蚀产物组成大致相同,主要为Fe3O4、Fe2O3,伴有少量FeS;杂散电流的存在会加剧Q235钢腐蚀,在同等外加电流下,交流杂散电流腐蚀的危害程度是直流杂散电流腐蚀的15.9%。
Abstract
Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were applied to observe and analyze the corrosion morphology and corrosion products of Q235 steel under the interference of DC/AC stray current in Hainan soil. The electrochemical parameters in corrosion process were also measured. The results show that stray current corrosion had obvious electrolytic corrosion characteristics. The areas of metal components where current flowed into were protected as cathode, on the contrary, the areas of metal components where current flowed out were corroded as anode. DC/AC stray current corrosion showed concentrated corrosion characteristics. The corrosion products were flocculent. The phenomena of delaminating and detachment were obvious in both product layers, so the product layers could not protect substrate. The corrosion products of DC/AC stray current corrosion were similar, which were mainly composed of Fe3O4 and Fe2O3, with a small amount of FeS. The existence of stray current aggravated the corrosion of Q235 steel. Under the same external current condition, the damage degree of AC stray current corrosion was 15.9% of that of DC stray current corrosion.
中图分类号 TG174 DOI 10.11973/fsyfh-201710004
所属栏目 试验研究
基金项目
收稿日期 2016/1/29
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联系人作者胡家秀(jxhu@imr.ac.cn)
引用该论文: FU Chuanfu,YANG Bingkun,YANG Daning,HU Jiaxiu,ZHAO Jian,HAN Enhou,KE Wei. Stray Current Corrosion of Q235 Steel in Hainan Soil[J]. Corrosion & Protection, 2017, 38(10): 756
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参考文献
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【2】DAROWICKI K,ZAKOWSKI K. A new time-frequency detection method of stray current field interference on metal structures[J]. Corrosion Science,2007,46(5):1061-1070.
【3】BERTOLINI L,CARSANA M,PEDEFERRI P. Corrosion behaviour of steel in concrete in the presence of stray current[J]. Corrosion Science,2007,49(3):1056-1068.
【4】宋吟蔚,王新华,何仁洋,等. 埋地钢质管道杂散电流腐蚀研究现状[J]. 腐蚀与防护,2009,30(8):515-518.
【5】BARLO T J,ZDUNEK A D. Stray current corrosion in electrified rail systems-final report[R].[S.l.]:[s.n.],1995.
【6】张攀峰,於孝春. 受直流杂散电流影响埋地管线的AN-SYS模拟[J]. 腐蚀与防护,2011,32(2):146-149.
【7】ATTIA M S,RAGAB A R,ELRAGHY S. Failure analysis of buried piping and cold drain vessel[J]. Engineering Failure Analysis,2011,18(3):933-943.
【8】FU A Q,CHENG Y F. Effects of alternating current on corrosion of a coated pipeline steel in a chloride containing carbonate/bicarbonate solution[J]. Corrosion Science,2010,52(2):612-619.
【9】姜子涛,杜艳霞,董亮,等. 交流电对Q235钢腐蚀电位的影响规律研究[J]. 金属学报,2011,47(8):997-1002.
【10】杜晨阳,曹备,吴荫顺. 交流电干扰下-850 mV(SCE)阴极保护电位准则的适用性研究[J]. 腐蚀与防护,2009,30(9):655-659.
【11】李自力,丁清苗,张迎芳,等. 用电化学方法建立交流干扰下X70钢的最佳阴极保护电位[J]. 腐蚀与防护,2010,31(6):436-439.
【12】李福军,路民旭,陈月勋. 大庆油田电泵井套管杂散电流腐蚀测试分析[J]. 材料保护,2008,41(10):66-67.
【13】张玉星,杜艳霞,路民旭. 动态直流杂散电流干扰下埋地管道的腐蚀行为[J]. 腐蚀与防护,2013,9(9):771-774.
【14】闫爱军,陈沂,冯拉俊. 几种接地网材料在土壤中的腐蚀特性研究[J]. 腐蚀科学与防护技术,2010,22(3):197-199.
【15】WU Y H,LIU T M,LUO S X,et al. Corrosion characteristics of Q235 steel in simulated Yingtan soil solutions[J]. Materials Science & Engineering Technology,2010,41(3):142-146.
【16】COLE I S,MARNEY D. The science of pipe corrosion:a review of the literature on the corrosion of ferrous metals in soils[J]. Corrosion Science,2012,56(3):5-16.
【17】李健,苏航,柴锋,等. pH值对Q235钢在模拟酸性土壤中腐蚀行为的影响[J]. 工程科学学报,2015,37(4):473-479.
【18】Control of external corrosion on underground or submerged metallic piping system:RP0169-2002[S]. Houston:NACE International.
【19】许建国. 浅谈杂散电流腐蚀机理及防护措施[J]. 铁道机车车辆,2005,25(3):61-64.
【20】杜翠薇,王胜荣,刘智勇,等. Q235钢与X70钢在新加坡土壤环境中1年腐蚀行为研究[J]. 腐蚀科学与防护技术,2015,27(3):231-236.
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