试片面积对破损涂层下埋地管道直流干扰程度评价结果的影响
Effect of Coupon Area on Evaluation Results of DC Interference Degree of Buried Pipeline Under Damaged Coating
摘 要
针对埋地油气管道杂散电流干扰影响,基于现场调研,研究了试片面积对评价破损涂层下埋地管道直流干扰程度的影响,探讨了直流干扰电压与试片面积、电流密度及腐蚀速率的关系。结果表明:试片的电流密度与干扰电压呈正相关,与试片面积呈负相关;在相同干扰电压下,试片的电流密度和腐蚀速率均随试片面积的减小而增大,1 cm2试片的腐蚀速率是6.5 cm2试片的4.70倍;当试片面积相同时,其腐蚀速率随干扰电压的升高而增大;在评估管道局部腐蚀风险时,对于受到明显直流干扰的管段,推荐使用1～6.5 cm2 试片进行腐蚀程度评估,使用1 cm2试片进行点蚀评价,使用6.5 cm2试片进行均匀腐蚀评价。
直流干扰
试片
腐蚀速率
管道
stray current
DC interference
coupon
corrosion rate
pipeline
Abstract
Aiming at the influence of stray current interference on buried oil and gas pipelines, the influence of coupon area on the evaluation of DC interference degree of buried pipelines under damaged coatings was studied based on field investigation. The relationship among DC interference voltage and coupon area, current density and corrosion rate was discussed. The results showed that the current density of the test piece was positively correlated with the interference voltage and negatively correlated with coupon area. Under the same interference voltage, the current density and corrosion rate of the coupon increased with the decrease of coupon area, and the corrosion rate of the 1 cm2 coupon was 4.70 times that of the 6.5 cm2 coupon. When the area of the coupon was the same, the corrosion rate increased with the increase of interference voltage. When evaluating the risk of local corrosion of pipelines, for pipeline sections with obvious DC interference, it was recommended to use 1-6.5 cm2 coupons for corrosion degree evaluation, 1 cm2 test pieces for pitting evaluation, and 6.5 cm2 coupon for uniform corrosion evaluation.
中图分类号 TE980.42 DOI 10.11973/fsyfh-202306006
所属栏目 试验研究
基金项目 国家自然科学基金项目(52071320)
收稿日期 2022/2/22
修改稿日期
网络出版日期
作者单位点击查看
联系人作者闫茂成(yanmc@imr.ac.cn)
引用该论文: WANG Mengmeng,PENG Yunchao,LIU Dawei,YAN Maocheng,GAO Bowen,FAN Weihua. Effect of Coupon Area on Evaluation Results of DC Interference Degree of Buried Pipeline Under Damaged Coating[J]. Corrosion & Protection, 2023, 44(6): 34
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参考文献
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【2】OGUNSOLA A,MARISCOTTI A,SANDROLINI L.Estimation of stray current from a DC-electrified railway and impressed potential on a buried pipe[J].IEEE Transactions on Power Delivery,2012,27(4):2238-2246.
【3】秦润之,杜艳霞,姜子涛,等.高压直流输电系统对埋地金属管道的干扰研究现状[J].腐蚀科学与防护技术,2016,28(3):263-268.
【4】CUI G,LI Z L,YANG C,et al.The influence of DC stray current on pipeline corrosion[J].Petroleum Science,2016,13(1):135-145.
【5】JUNKER A, HEINRICH C, NIELSEN L V, et al. Laboratory and field investigation of the effect of the chemical environment on AC corrosion[C]//Proceedings of the NACE International Corrosion Conference. [S.l.]:NACE International:2018.
【6】NIELSEN L V,PETERSEN M,BORTELS L,et al.Effect of coating defect size,coating defect geometry,and cathodic polarization on spread resistance:Consequences in relation to AC corrosion monitoring[J]. CeoCor, Bruges, 2010: 1-14.
【7】AHN S H,LEE J H,KIM J G,et al.Localized corrosion mechanisms of the multilayered coatings related to growth defects[J].Surface and Coatings Technology,2004,177/178:638-644.
【8】DONG C F,FU A Q,LI X G,et al.Localized EIS characterization of corrosion of steel at coating defect under cathodic protection[J].Electrochimica Acta,2008,54(2):628-633.
【9】KUANG D,CHENG Y F.AC corrosion at coating defect on pipelines[J].Corrosion,2015,71(3):267-276.
【10】秦峰,朱祥连,奚杰,等.城市轨道交通设施杂散电流的防护[J].机电工程,2013,30(1):102-107.
【11】秦润之,杜艳霞,路民旭,等.高压直流干扰下X80钢在广东土壤中的干扰参数变化规律及腐蚀行为研究[J].金属学报,2018,54(6):886-894.
【12】于利宝,徐兆东,孙海星,等.剥离PE防腐层破损点下钢质管线的阴极保护[J].全面腐蚀控制,2016,30(11):41-44.
【13】杨霜,唐囡,闫茂成,等.温度对X80管线钢酸性红壤腐蚀行为的影响[J].中国腐蚀与防护学报,2015,35(3):227-232.
【14】QIAN S,FRANK CHENG Y.Corrosion of pipelines under dynamic direct current interference[J]. Construction and Building Materials,2020,261:120550.
【15】宋轶黎,胡喜艳,席发臣,等.一种新型锈蚀转化剂的作用机理研究[J].腐蚀科学与防护技术,2015,27(1):13-18.
【16】王晓霖,闫茂成,舒韵,等.破损涂层下管线钢的交流电干扰腐蚀行为[J].中国腐蚀与防护学报,2017,37(4):341-346.
【17】赵君,闫茂成,吴长访,等.干湿交替土壤环境中剥离涂层管线钢阴极保护有效性[J].腐蚀科学与防护技术,2018,30(5):508-512.
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