磁场对X70管线钢电化学腐蚀行为的影响

Effect of Magnetic Field on the Electrochemical Corrosion Behavior of X70 Pipeline Steel

为研究磁场对X70管线钢电化学腐蚀行为的影响以及磁场对在库尔勒土壤模拟溶液中浸泡后X70钢腐蚀行为的影响,利用电化学试验、浸泡试验和金相分析等手段,考察了不同磁场强度、不同磁场方向和有无产物膜时管线钢的电化学腐蚀行为。结果表明:随着磁场强度的增加,X70钢的腐蚀速率先增大后减小;改变磁场方向对X70钢的电化学腐蚀行为无明显影响。X70钢分别浸泡3、5 d后,2种情况下管线钢的腐蚀趋势是相同的,都是随着外加磁场的增加,腐蚀速率增大。X70钢表面有产物膜时的吸附电阻比无产物膜时的大,有产物膜时的腐蚀电流密度也较小,腐蚀程度较轻;而不同浸泡时间对腐蚀电流密度的影响不大。

To investigate the effect of magnetic field on the electrochemical corrosion behavior of X70 pipeline steel and the effect of magnetic field on the corrosion behavior of X70 steel after immersed in Kuerle soil simulation solution,the electrochemical corrosion behavior of pipeline steel under different magnetic field strengths,directions and the presence or absence of product films was analyzed by electrochemical tests,immersion tests and metallographic analysis.Results showed that as the magnetic field strength increased,the corrosion rate of X70 steel first increased and then decreased.Changing the direction of the magnetic field had no significant effect on the electrochemical corrosion behavior of X70 steel.The corrosion trend of X70 pipeline steel was the same in both cases after immersed for 3 and 5 d,respectively,and the corrosion rate increased with the increase of external magnetic field.Moreover,the adsorption resistance of X70 steel with a product film on its surface was higher than that without a product film,and the X70 steel with the product film exhibited lower corrosion current density and lighter corrosion degree.However,different immersing times had little effect on the corrosion current density.