粒径和温度对20号钢冲刷腐蚀协同作用的影响

Effect of Sand Size and Temperature on Synergistic Effect of Erosion-corrosion for 20 Steel in Simulated Oilfield Produced Fluid with Sand

利用旋转圆柱电极实验装置,在模拟油田采出液中,通过腐蚀失重、形貌观测和电化学分析等方法量化20号钢在不同砂粒粒径和温度下的冲刷腐蚀协同作用。结果表明,砂粒粒径增大对20号钢的冲刷磨损有明显的促进作用,这与形貌观测较符合。随砂粒粒径增大,腐蚀促进冲刷的作用和冲刷促进腐蚀的作用均先增加后减小。在砂粒粒径为40~70μm到120~200μm时,材料冲刷腐蚀以冲刷-电化学混合控制为主;砂粒粒径为200~300μm时,以冲刷磨损为主导。在不同的温度下,20号钢的冲刷腐蚀均以冲刷-电化学为主要控制;温度越高,腐蚀对冲刷的促进作用越显著。

The erosion-corrosion behavior of 20 steel in simulated oilfield produced fluid with different sand particle sizes and at different temperatures was studied via a rotating cylindrical electrode experimental device,as well as other methods such as corrosion mass loss measurement,morphological observation and electrochemical techniques.The results show that the increase of sand particle size can obviously promote the erosion wear of 20 steel,which is consistent with the morphology observation.With the increase of sand particle size,both the effect of corrosion promoting erosion and the effect of erosion promoting corrosion firstly increase and then decrease.When the sand particle size is in the range of 40~70μm to 120~200μm,the erosion-corrosion mode of the steel may mainly be ascribed to the mixed control of erosion and electrochemical corrosion.When the particle size of the sand is 200~300μm,the erosion wear is dominant.The erosion-corrosion of 20 steel at different temperatures is mainly controlled by erosion and electrochemical corrosion.The higher the temperature,the much obvious the promotion effect of corrosion on erosion.