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采用浸泡失重、动电位极化和电化学阻抗等方法研究了温度和溶解氧对X80管线钢在库尔勒土壤模拟溶液中腐蚀行为的影响,通过扫描电镜和X射线衍射仪测试了腐蚀产物的形貌和组成,通过溶解氧测试仪和电导率仪分别测试了不同条件下溶液中氧的含量和电导率。结果表明:温度和溶解氧不能改变X80管线钢表面腐蚀产物膜的组成,但温度由25℃升高到35℃,溶液中溶解氧的含量变化不明显,电导率明显上升,离子运动速度增大,腐蚀速率因而增大;当采用氮气除氧以后,溶解氧含量下降幅度远大于溶液电导率的下降幅度,腐蚀反应速率明显减小,溶解氧成为影响X80管线钢腐蚀速率的主要因素。
The effects of temperature and dissolved oxygen on the corrosion behavior of X80 pipeline steel in simulated solution of Korla soil were studied by immersion weight loss, potentiodynamic polarization and electrochemical impedance. The morphology of the corrosion products was tested by scanning electron microscopy and X-ray diffractometer And composition, dissolved oxygen tester and conductivity meter were tested under different conditions, the oxygen content of the solution and conductivity. The results show that temperature and dissolved oxygen can not change the composition of corrosion products on the surface of X80 pipeline steel. However, when the temperature rises from 25 ℃ to 35 ℃, the content of dissolved oxygen in the solution does not change obviously, the conductivity increases obviously and the ion velocity increases , And the corrosion rate is increased. When nitrogen is used, the decrease of dissolved oxygen content is much larger than that of solution conductivity, and the corrosion reaction rate decreases obviously. Dissolved oxygen becomes the main factor that affects the corrosion rate of X80 pipeline steel.