摘要
本文通过高盐、高温工况环境模拟测试,研究了两种输油管道防腐用漆酚钛聚合物(UTP)涂层的防腐性能,并与两种商业化酚醛环氧涂层进行了对比分析,以期对极端环境下输油管线防腐涂层的应用进行优化。采用扫描电镜(SEM)、电化学阻抗谱(EIS)、傅里叶变换红外光谱(FTIR)对经过31天的腐蚀测试后涂层样品的表面形貌、阻抗和化学结构变化进行了对比表分析。结果表明,涂层失效的主要原因在于涂层破坏后基材直接暴露于电解质环境所致。腐蚀性成分可通过涂层裂纹和微孔对基材进行腐蚀。腐蚀过程开始于涂层聚合物降解和应力引起的涂层材料缓慢破坏,并最终导致碳钢基材的局部腐蚀。在模拟腐蚀环境下,UTP涂层能够提供优异的防腐蚀作用,主要归功于其分子结构良好的化学稳定性和材料微观结构的整体性。
Two anti-corrosion coatings based on urushiol-titanium chelate polymer(UTP) are analyzed and compared with commercially available phenolic novolac epoxy coatings in a simulated solution environment with high salinity and high temperature. This study aims to optimize the application of the anti-corrosion coatings in oil pipelines in extreme aggressive environments. The changes in the morphology, impedance and structure of the coatings after 31 days corrosion test have also been investigated by scanning electron microscopy(SEM), electrochemical impedance spectroscopy(EIS) and Fourier transform infrared(FTIR) spectroscopy. The failure is mainly attributed to the exposure of fresh surfaces of the substrate to the electrolyte due to the damage in the coating. In some cases the corrosive species attacked the substrate material through cracks and the micropores. The deterioration process of the coating on the steel substrate starts from a slow corrosion damage of the coating caused by polymer degradation or stress and then progresses finally into a localized corrosion damage of the carbon steel substrate. The UTP coating can provide excellent anti-corrosion property in aggressive environment, which is predominantly attributed to the synergistic effect of phase composition stability and microstructural integrity.
作者
李海蓉
池恒
胡翔
彭煜
包福
王昱
谢震宇
姜明
LI Hai-rong;CHI Heng;HU Xiang;PENG Yu;BAO Fu;WANG Yu;XIE Zhen-yu;JIANG Ming(Mechanical Metrology Division,Hubei Institute of Measurement and Testing Technology.Wuhan 430223,China;Beijing Engineering Branch of China Petroleum Engineering&Construction Corporation.Beijing 100085,China;School of Materials Science and Engineering,Wuhan Textile University.Wuhan 430200,China)
出处
《全面腐蚀控制》
2021年第12期16-21,40,共7页
Total Corrosion Control
关键词
输油管线
防腐性能
涂层
漆酚钛聚合物
电化学阻抗
oil pipeline
anti-corrosion property
coating
urushiol-titanium chelate polymer
EIS
