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针对某20钢输氢管道在大庆地区沼泽环境服役过程中的管道外表面开裂问题,采用化学成分分析、体式显微镜、扫描电镜(SEM)、能谱分析(EDS)等方法对管道腐蚀进行了分析。结果表明:输氢管道外表面的机械损伤在服役环境存在的应力和腐蚀介质协同作用下,使得损伤区域产生微裂纹并逐步扩展,导致管道发生腐蚀失效。因此,对于管道不仅要改进管道本身的防腐工艺,还要针对管道本身服役环境,采用相应的防腐措施。
Aiming at the cracking of the pipe outer surface during the service of a 20 steel pipe in Daqing district, the pipeline corrosion was analyzed by chemical composition analysis, scanning electron microscope (SEM) and energy spectrum analysis (EDS) . The results show that the mechanical damage on the outer surface of the hydrogen delivery pipeline under the synergistic effect of stress and corrosive media in the service environment causes micro-cracks in the damaged area and gradually expands, resulting in corrosion failure of the pipeline. Therefore, for the pipeline not only to improve the pipeline itself anti-corrosion technology, but also for the pipeline itself service environment, the use of appropriate anti-corrosion measures.