管道3PE防腐蚀涂层剥离的原因分析
Reason Analysis of 3PE Coating Delamination from Pipeline
摘 要
为明确西南管道3PE防腐蚀涂层（有孔和无孔）剥离的原因，通过现场调研初步明确了涂层剥离的主要原因，并通过电化学测试分析了破损涂层下涂层/金属界面上电解质的扩散过程，通过差示扫描量热法分析了剥离涂层和未剥离涂层的玻璃化转变温度。结果表明：当涂层发生破损时，电解质在涂层/金属界面上的扩散是引起涂层剥离的主要原因，其扩散过程分为腐蚀缝隙形成过程、氧浓差腐蚀过程和析氢腐蚀过程三个阶段；当涂层完好却发生大面积剥离时，这主要是由于环氧底层的玻璃化转变温度太低导致其与基体结合力不够引起的。
剥离
阴极保护
涂层/金属界面
玻璃化温度
3PE anti-corrosion coating
delamination
cathodic protection
coating/metal interface
glass transition temperature
Abstract
The reasons for delamination of anti-corrosion coating with and without damages from pipeline in southwest China were analyzed. Firstly, field survey was carried out to preliminarily determine the main reasons for coating delamination, and then electrochemical tests were used to analyze the diffusion process of electrolyte on coating/metal interface, meanwhile differential scanning calorimetry (DSC) was applied to obtain the glass transition temperature of coating with and without delamination. The results show that the main reason for damage of coating was due to the diffusion of electrolyte on coating/metal interface. And the diffusion process could be divided into three stages: formation of corrosion crevice, oxygen concentration corrosion and hydrogen evolution process. When the glass transition temperature of epoxy coating was too low to obtain sufficient adhesion to the substrate, the coating was intact but delaminated in large area.
中图分类号 U177 DOI 10.11973/fsyfh-202010012
所属栏目 失效分析
基金项目 中石化纵向课题（30251731-16-ZC0607-0004）
收稿日期 2018/7/27
修改稿日期
网络出版日期
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引用该论文: YANG Dashen,XIONG Daoying,WANG Yao,ZHAO Lianqi,LI Zili. Reason Analysis of 3PE Coating Delamination from Pipeline[J]. Corrosion & Protection, 2020, 41(10): 63
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参考文献
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【3】CHEN X,LI X G,DU C W,et al. Effect of cathodic protection on corrosion of pipeline steel under disbonded coating[J]. Corrosion Science,2009,51(9):2242-2245.
【4】LIU X W,XIONG J P,LV Y,et al. Study on corrosion electrochemical behavior of several different coating systems by EIS[J]. Progress in Organic Coatings,2009,64(4):497-503.
【5】埋地钢质管道腐蚀防护工程检验:GB/T 19285-2014[S].
【6】埋地钢质管道聚乙烯防腐层:GB/T 23257-2009[S].
【7】张颖怀,许立宁,路民旭,等. 用电化学阻抗谱(EIS)研究环氧树脂涂层的防腐蚀性能[J]. 腐蚀与防护,2007,28(5):227-230.
【8】石油天然气集团公司. 埋地钢质管道阴极保护参数测量方法:GB/T 21246-2007[S]. 北京:中国标准出版社,2008.
【9】蔡光义,张德平,赵苇杭,等. 有机涂层防护性能与失效评价研究进展[J]. 腐蚀与防护,2017,38(9):657-664.
【10】KENDIG M,MANSFELD F,TSAI S. Determination of the long term corrosion behavior of coated steel with A.C. impedance measurements[J]. Corrosion Science,1983,23(4):317-329.
【11】VAN WESTING E P M,FERRARI G M,DE WIT J H W. The determination of coating performance with impedance measurements-Ⅱ.Water uptake of coatings[J]. Corrosion Science,1994,36(6):957-977.
【12】PEREZ C,COLLAZO A,IZQUIERDO M,et al. Characterisation of the barrier properties of different paint systems:part I. experimental set-up and ideal Fickian diffusion[J]. Progress in Organic Coatings,1999,36(1/2):102-108.
【13】OLDFIELD J W,SUTTON W H. Crevice corrosion of stainless steels:I.a mathematical model[J]. British Corrosion Journal,1978,13(1):13-22.
【14】OLDFIELD J W,SUTTON W H. Crevice corrosion of stainless steels:Ⅱ.experimental studies[J]. British Corrosion Journal,1978,13(3):104-111.
【15】PICKERING H W,FRANKENTHAL R P. On the mechanism of localized corrosion of iron and stainless steel:I. electrochemical studies[J]. Journal of the Electrochemical Society,1972,119(10):1297-1304.
【16】FRANKENTHAL R P,PICKERING H W. On the mechanism of localized corrosion of iron and stainless steel:Ⅱ. morphological studies[J]. Journal of the Electrochemical Society,1972,119(10):1304-1310.
【17】HUSAIN A,FAKHRALDEEN A. In-situ surface potential characterization of a cathodically polarized coating[J]. Desalination,2003,158(1/2/3):29-34.
【18】TOUZAIN S. Some comments on the use of the EIS phase angle to evaluate organic coating degradation[J]. Electrochimica Acta,2010,55(21):6190-6194.
【19】REUVERS N J W,HUININK H P,ADAN O C G,et al. Water uptake in thin nylon 6 films as measured by electrochemical impedance spectroscopy and magnetic resonance imaging[J]. Electrochimica Acta,2013,94:219-228.
【20】GUPTA V B,BRAHATHEESWARAN C. Molecular packing and free volume in crosslinked epoxy networks[J]. Polymer,1991,32(10):1875-1884.
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