环氧纳米粉末涂层现场应用评价与缓蚀剂技术研究  

Field Application of Epoxy Nano Powder Coating and Corrosion Inhibitor Technology

作　　者：李金灵[1,3] 蔡锐 付安庆[4] 尹成先 朱世东[2,4] 宋少华[2,4] LI Jin-ling;CAI Rui;FU An-qing;YIN Cheng-xian;ZHU Shi-dong;SONG Shao-hua(Shaanxi Key Laboratory of Environmental Pollution Control Technology and Reservoir Protection of OilField,School of Chemistry&Chemical Engineering,Xi'an Shiyou University,Xi'an 710065,China;School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;State Key Laboratory of Petroleum Pollution Control,CNPC Research Institute of Safety and Environmental Technology,Beijing 102206,China;State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi'an 710077,China;Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安石油大学化学化工学院陕西省油气田环境污染控制技术与储层保护重点实验室,西安710065 [2]西安石油大学材料科学与工程学院,西安710065 [3]中国石油集团安全环保技术研究院石油石化污染物控制与处理国家重点实验室,北京102206 [4]中国石油天然气集团公司管材研究所石油管材及装备材料服役行为与结构安全国家重点实验室,西安710077 [5]西安交通大学,西安710049

出　　处：《表面技术》2019年第12期312-319,共8页Surface Technology

基　　金：国家自然科学基金(51974245,21808182);西安石油大学研究生创新与实践能力培养项目(YCS18212052)~~

摘　　要：目的研究一种环氧纳米粉末涂层在新疆某油田的适用性与缓蚀剂技术。方法利用高温高压釜模拟涂层在新疆某油田三种典型工况条件,结合腐蚀失重法以及结合力测试、阴极剥离、扫描电子显微电镜、交流阻抗等手段,分析环氧纳米粉末涂层腐蚀后的形态及其与基体的结合度,对其服役寿命进行预测,并研究缓蚀剂添加对未涂覆、破损和完整三种涂层状态下试样腐蚀行为的影响。结果环氧纳米粉末涂层在三种典型环境中未出现鼓泡和开裂现象,且与基体结合较好。环氧纳米粉末涂层的阴极剥离半径小于5 mm,由阴极剥离半径和阻抗值所预测的寿命分别为883d和740d。破损涂层的均匀腐蚀和点蚀速率分别为0.6172 mm/a和1.5720 mm/a,而完整涂层的腐蚀速率仅为0.0029 mm/a,破损涂层阻抗值与完整涂层的阻抗值相差103倍。微量的缓蚀剂添加可降低无涂层和破损涂层试样的腐蚀速率1个数量级,其缓蚀效率分别高达91.05%和92.75%。结论环氧纳米粉末涂层在三种典型腐蚀环境中具有好的耐蚀性能,抗剥离能力也较好,阴极剥离半径与阻抗值两种方法所预测的寿命基本一致。然而涂层一旦破损,腐蚀较为严重,尤其是点蚀,微量缓蚀剂的添加可实现不同防护技术间的优势互补。The work aims to study the applicability of an epoxy Nano powder coating in an oilfield of Xinjiang and corrosion inhibitor technology.Three typical working conditions of coating in an oil field in Xinjiang were simulated by high temperature and high pressure autoclave,along with corrosion weight loss method,bonding force test,cathode stripping,scanning electron microscope,and AC impedance,etc.The morphology of epoxy nano-powder coating and its binding degree to the matrix were analyzed.The service life of the coating was predicted;and the effects of corrosion inhibitor on corrosion behavior of samples with uncoated,damaged and intact coatings were studied.The results showed that the bubbling and cracking did not present on the epoxy nano powder coating after corroded in three typical environments;and the coating was well combined with the substrate.The cathode stripping radius of epoxy nano powder coating was less than 5 mm;and the lifetime predicted by the cathode stripping radius and impedance values was 883 d and 740 d,respectively.The uniform corrosion and pitting rates of the damaged coating was 0.6172 mm/a and 1.5720 mm/a,respectively;while the corrosion rate of the complete coating was only 0.0029 mm/a;and the impedance value of the damaged coating was 103 times than that of the intact coating.And the corrosion rate of uncoated and damaged coating samples were reduced by one order of magnitude owing to the addition of the small amount of corrosion inhibitor;and their corrosion inhibition efficiency was 91.05%and 92.75%,respectively.Therefore,this epoxy nano powder coating has good corrosion resistance in three typical corrosion environments.Its anti-stripping ability is also good.The prediction life of stripping radius and impedance is basically consistent;while once the coating is damaged,the corrosion is more serious,especially pitting corrosion.The complementary advantages of different protective technologies can be achieved owing to the addition of small amount of corrosion inhibitor.

关 键 词：涂层 环氧纳米粉末 寿命预测 缓蚀剂 EIS 

分 类 号：TG172.8[金属学及工艺—金属表面处理]