油田回注污水对常用管线钢的腐蚀性

CORROSIVITY OF WASTEWATER IN OILFIELD ON PIPELINE STEELS

通过水质分析和动态挂片试验，应用EDS、SEM、XRD等研究了回注污水对常用管线钢20g、16Mn的腐蚀性．结果表明。在温度T=50℃～70℃及常压下，回注污水对以上材料的腐蚀主要为局部氧腐蚀和氯腐蚀．50℃时，平均腐蚀率（mm／a）为：0．1245（20g）、0．119（16Mn）．70℃时，平均腐蚀率（mm／a）为：0．3105（20g）、0．3185（16Mn）．对其腐蚀机理进行了探讨．

Corrosion of 20 g and 16Mn steels used for wastewater pipe in oilfield was investigated through dynamic total immersion tests in wastewaters with chemical analysis of wastewaters, as well as EDS, SEM and XRD. The results showed that the corrosion mechanism of the above materials was local oxidation-corrosion induced by oxygen and chlorine under atmosphere pressure at T = 50℃ - 70℃. When T= 50℃, the corrosion rates （mm/a） were 0. 1245 （20g） and 0. 119 （16Mn） ;T= 70℃, the corrosion rates （mm/a） were 0. 3105 （20g） and 0. 3185 （16Mn）, respectively.