某油轮排海回流管线发生腐蚀泄漏,穿孔直径约45mm,给油田造成了极大的安全隐患和经济损失。通过理化性能试验、扫描电镜和电谱分析、电化学试验研究了管线的腐蚀失效原因。结果表明:CO2生成的FeCO3等沉积导致的垢下腐蚀,是造成管线穿孔的主要原因。 Corrosion leaks occur in the return line of a tanker sea. The perforation diameter is about 45mm, causing great potential safety hazard and economic loss to the oilfield. Through the physical and chemical properties test, the scanning electron microscope and the electricity spectrum analysis, the electrochemical experiment studies the pipeline corrosion failure reason. The results show that the corrosion of scale caused by the deposition of FeCO3 and other deposits caused by CO2 is the main reason for the pipeline perforation.