氧燃料离子化喷涂铁基非晶涂层结构和CO_2腐蚀研究  

Microstructure and CO_2 corrosion resistance of Fe-based amorphous coating prepared by oxy fuel ionization(OFI) spraying method

作　　者：蔡峰[1] 柳伟[1] 林学强[1] 路民旭[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《粉末冶金技术》2013年第2期132-138,共7页Powder Metallurgy Technology

摘　　要：采用氧燃料离子化喷涂工艺成功在碳钢表面制备了铁基非晶涂层,用X射线衍射仪、扫描电镜、显微硬度计分析涂层的组织结构和硬度,并用原位电化学方法对高温高压CO2条件下涂层的耐腐蚀性能进行了研究。结果表明:所制备的涂层主要由非晶相组成,同时有少量纳米级晶相分布;涂层呈典型层状分布,结构致密,孔隙度仅为0.34%,与基体结合紧密;涂层的平均显微硬度为1350HV0.1,且硬度沿涂层厚度分布均匀;电化学测试表明,在高温高压油气田饱和CO2采出液中,涂层耐均匀腐蚀能力强于碳钢基体材料,但低于316L不锈钢和2507双相不锈钢;另一方面,与316L不锈钢相比,涂层耐点蚀能力显著提高,与2507双相不锈钢接近。Fe-based amorphous coating had been successfully prepared on carbon steel substrate by oxy fuel ionization process. The microstructure and micro-hardness of the coating were characterized using X-ray diffraction （XRD） , scanning eleeron microscopy （SEM） and microscopic hardness meter. CO2 corrosion resistance of the coating was examined using in-situ electrochemical methods under high temperature and high pressure environment. The results demonstrate that the coating consists of almost fully amorphous structure, with some nano-crystalline phases embed in amorphous matrix. The coating presents a very dense and typical lamella structure with the porosity of 0. 34% . In addition, the coating and the substrate are bonded well. The average micro-hardness of coating is 1 350HV0.1 and homogeneously distributes along the thickness of the coating. The electrochemical measurement reveals the coating exhibits better uniform corrosion resistance than that of carbon steel substrate but inferior to that of 316L stainless steel and 2507 duplex super stainless steel in CO2-saturated oil field formation water. On the other hand, the coating has higher pitting corrosion resistance than 316L stainless steel, which closes to that of 2507 duplex super stainless steel.

关 键 词：氧燃料离子化 铁基涂层 非晶结构 CO2腐蚀 

分 类 号：TG174.44[金属学及工艺—金属表面处理]