管道3PE防腐蚀层阴极剥离的影响因素
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摘要
开展了3PE防腐蚀层各类影响因素的阴极剥离加速试验,通过剥离距离及层次分析法得到各因素对3PE防腐蚀层阴极剥离的影响。结果表明:环境参数中,溶液含盐量、氯离子含量、防腐蚀层破损面积对3PE防腐蚀层的阴极剥离基本没有影响;增加阴保电位会使剥离距离呈线性增大;3PE防腐蚀层在近中性溶液中的阴极剥离距离最小;剥离距离随土壤含水率的增加而增加,当其达到饱和状态后,剥离距离变化不大。加工参数中,较低的锚纹深度、较高的表面灰尘度都将促进阴极剥离,阴极剥离距离的增加趋势与环氧底层的厚度呈正比。加工参数对阴极剥离的影响远大于环境参数的。
The cathodic disbondment accelerated test of various influencing factors of 3 PE anti-corrosion layer was carried out, and the influence of various factors on the cathodic disbonding of 3 PE anti-corrosion layer was obtained by peeling distance and analytic hierarchy process. The results show that in the environmental parameters, the salt content of solution, the concentration of chloride ions, and the damage area of the anti-corrosion layer had little effect on the cathodic disbonding of 3 PE anti-corrosion layer; increasing the negative potential would increase the linearity of the peeling distance, and 3 PE anti-corrosion layer had the smallest cathodic separation distance in the near-neutral solution. The peeling distance increased with the increase of soil moisture content, and when it reached saturation,the peeling distance was almost unchanged. Among the processing parameters, lower anchor depth and higher surface dust degree would promote the cathodic disbondment, and the increase trend of cathodic disbonding distance was proportional to the thickness of epoxy underlayer. The influence of processing parameters on cathodic disbondment was much greater than that of environmental parameters.
The cathodic disbondment accelerated test of various influencing factors of 3 PE anti-corrosion layer was carried out, and the influence of various factors on the cathodic disbonding of 3 PE anti-corrosion layer was obtained by peeling distance and analytic hierarchy process. The results show that in the environmental parameters, the salt content of solution, the concentration of chloride ions, and the damage area of the anti-corrosion layer had little effect on the cathodic disbonding of 3 PE anti-corrosion layer; increasing the negative potential would increase the linearity of the peeling distance, and 3 PE anti-corrosion layer had the smallest cathodic separation distance in the near-neutral solution. The peeling distance increased with the increase of soil moisture content, and when it reached saturation,the peeling distance was almost unchanged. Among the processing parameters, lower anchor depth and higher surface dust degree would promote the cathodic disbondment, and the increase trend of cathodic disbonding distance was proportional to the thickness of epoxy underlayer. The influence of processing parameters on cathodic disbondment was much greater than that of environmental parameters.
引文
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[14] DEFLORIAN F,ROSSI S. An EIS study of ion diffusion through organic coatings[J]. Electrochimica Acta,2006,51(8):1736-1744.
[15]张其滨,刘金霞,赫连建峰,等.管道3PE涂层的阴极剥离性能研究[J].腐蚀与防护,2006,27(7):331-333.
[16] JR H L, WANG W, IGETOFT L. The mechanism for the cathodic delamination of organic coatings from a metal surface[J]. Progress in Organic Coatings,1983,11(1):19-40.
[17]朱琳,崔伟,邢云颖,等.3PE防腐蚀层失效分析与寿命预测[J].腐蚀与防护,2017,38(8):650-656.
[18] SKAR J I,STEINSMO U. Cathodic disbonding of paint films-transport of charge[J]. Corrosion Science,1993,35(5/8):1385-1389.
[19] STEINSMO U,SKAR J I. Factors influencing the rate of cathodic disbonding of coatings[J]. Corrosion Houston Tx,2012,50(12):934-939.
[20] KHUN N W, FRANKEL G S. Effects of surface roughness, texture and polymer degradation on cathodic delamination of epoxy coated steel samples[J]. Corrosion Science,2013,67(67):152-160.
[2]王德增.管道防腐涂层防腐性能优化研究[D].东营:中国石油大学(华东),2009.
[3]张婷,龚敏,林修洲,等.3PE防腐蚀层联合阴极保护对管道的保护效果[J].腐蚀与防护,2012,33(9):765-768.
[4]王玉梅,李莉.90年代国内外管道外防腐层技术[J].油气储运,1997,16(9):22-28.
[5]尹国耀,雷胜利.3PE管道防腐在国内十年的实践[J].焊管,2007,30(1):8-11.
[6]吕德东.油田埋地管道防腐层破损点检测及影响因素[J].管道技术与设备,2007(3):39-40.
[7]孟繁亮.管道防腐层破损原因及检测技术探讨[J].化学工程与装备,2011(5):107-111.
[8] ZIN I M, LYON S B, HUSSAIN A. Under-film corrosion of epoxy-coated galvanised steel:an EIS and SVET study of the effect of inhibition at defects[J].Progress in Organic Coatings,2005,52(2):126-135.
[9]张爱民,张丽丽.3PE防腐层失效现象分析[J].辽宁化工,2011,40(11):1199-1200.
[10]赵增元,王佳.有机涂层阴极剥离作用研究进展[J].中国腐蚀与防护学报,2008,28(2):116-120.
[11] HERNANDEZ M A, GALLIANO F,LANDOLT D.Mechanism of cathodic delamination control of zinc-aluminum phosphate pigment in waterborne coatings[J]. Corrosion Science, 2004,46(9):2281-2300.
[12] BI H,SYKES J. Cathodic delamination of unpigmented and pigmented epoxy coatings from mild steel[J].Progress in Organic Coatings,2016,90:114-125.
[13] LENG A,STRECKEL H,STRATMANN M. Corrigendum to"The delamination of polymeric coatings from steel. Part 2:First stage of delamination, effect of type and concentration of cations on delamination,chemical analysis of the interface”[Corros. Sci. 41(1998)579-597][J]. Corrosion Science,2011,53(10):579-597.
[14] DEFLORIAN F,ROSSI S. An EIS study of ion diffusion through organic coatings[J]. Electrochimica Acta,2006,51(8):1736-1744.
[15]张其滨,刘金霞,赫连建峰,等.管道3PE涂层的阴极剥离性能研究[J].腐蚀与防护,2006,27(7):331-333.
[16] JR H L, WANG W, IGETOFT L. The mechanism for the cathodic delamination of organic coatings from a metal surface[J]. Progress in Organic Coatings,1983,11(1):19-40.
[17]朱琳,崔伟,邢云颖,等.3PE防腐蚀层失效分析与寿命预测[J].腐蚀与防护,2017,38(8):650-656.
[18] SKAR J I,STEINSMO U. Cathodic disbonding of paint films-transport of charge[J]. Corrosion Science,1993,35(5/8):1385-1389.
[19] STEINSMO U,SKAR J I. Factors influencing the rate of cathodic disbonding of coatings[J]. Corrosion Houston Tx,2012,50(12):934-939.
[20] KHUN N W, FRANKEL G S. Effects of surface roughness, texture and polymer degradation on cathodic delamination of epoxy coated steel samples[J]. Corrosion Science,2013,67(67):152-160.