在模拟油田CO2腐蚀环境下，利用XRD、EDS和SEM研究了N8 0钢点蚀坑的形成与发展.结果表明，Cl-会在腐蚀产物膜与金属界面处富积成核，加速该 区域的阳极溶解，促使点蚀坑的形核；点蚀坑内也有Cl-富积，在膜与基体界面处形成厚 度为3 μm的富积层，加速点蚀坑内基体的腐蚀，使得点蚀坑进一步发展.同时，讨论了阳极 反应与点蚀坑形貌之间的关系.
In simulating the environment of CO2 corrosion in oilfield,the XRD，EDS and SEM techniques were adopted to study the formation an d development of CO2 pitting corrosion on N80 steel.The results demonstrated t hat Cl- anions could be enriched and nucleated at the interface between corros ion scale and matrix,which subsequently catalyzed the formation of pitting.Where as pits could also be enriched by Cl- forming approximately 3 μm enrichment l ayer at interface,thus leading to the further development of pitting.In present case,the relationship between mechanisms of anodic reaction and morphology of pi tting was discussed.
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