在用液氨管道保冷层下局部腐蚀现象研究  

Study on Local Corrosion of In-service Liquid Ammonia Pipeline under Cold Keeping Layer

作　　者：梁旭 Liang Xu(Fengtai Special Equipment Inspection and Testing Institute Beijing 100161)

机构地区：[1]丰台区特种设备检测所,北京100161

出　　处：《中国特种设备安全》2017年第8期72-77,80,共7页China Special Equipment Safety

基　　金：基金项目:氨制冷装置RBI与传统检验融合方法研究(编号:2015KQ002)

摘　　要：研究了液氨管道服役之后保冷层下外表面均匀腐蚀和局部腐蚀状态,结合对管道基体材质及腐蚀产物的研究,从蚀孔的成因、形成机理、易发区域以及蚀孔的发展四个方面分析了管道局部腐蚀的成因和影响因素,提出使用中造成较大风险的是局部腐蚀,严重的局部腐蚀会导致管道的突发性破坏,而这种破坏往往难以预测。最后从局部腐蚀的内在和外在因素出发提出了在用液氨管道局部腐蚀控制建议。This paper studies the uniform and local corrosion state in the outer surface of in-service liquid ammonia pipeline under cold keeping layer, analyzes the causes and influencing factors of pipeline local corrosion in four aspects of pitting cause, pitting formation mechanism, prone area and pitting development combing with the research on pipe base material and corrosion products, proposes that the local corrosion is the main risk in the use and the serious local corrosion will lead to the sudden destruction of the pipeline which is difficult to predict. Finally, based on the internal and external factors of local corrosion, some suggestions are put forward.

关 键 词：在用液氨管道 均匀腐蚀 局部腐蚀 孔蚀 孔蚀核 

分 类 号：X924[环境科学与工程—安全科学]