论文部分内容阅读
采用失重、SEM及XRD法,研究了阴极保护对Q235钢在兰州土壤中埋片4年后耐腐蚀性的影响。结果表明,施加阴极保护后Q235钢的耐蚀性远高于无阴极保护,有阴极保护时试片表面仅发生了较轻微的腐蚀,无阴极保护时Q235钢表面发生了明显的不均匀全面腐蚀和出现了大量的点蚀坑群;腐蚀产物的锈层主要由CaCO3和SiO2(表层)、Fe2O3和FeOOH(中间层)和Fe3O4(内层)组成,Q235钢的耐蚀性及腐蚀形态与钢表面生成的腐蚀产物膜的完整性和致密性有关;Q235钢在现场埋片过程中的阴极反应为氧的去极化反应;土壤中的含水量、Cl-和CO32-对Q235钢的腐蚀起主导作用。
The effects of cathodic protection on the corrosion resistance of Q235 steel in Lanzhou soil after 4 years of burial were studied by weight loss, SEM and XRD. The results show that the corrosion resistance of Q235 steel after applying cathodic protection is much higher than that without cathodic protection, and there is only slight corrosion on the surface of the test piece with cathodic protection. There is obvious uneven and complete corrosion And a large number of pits are formed. The rust layer of the corrosion products mainly consists of CaCO3 and SiO2 (surface layer), Fe2O3 and FeOOH (intermediate layer) and Fe3O4 (inner layer), and the corrosion resistance and corrosion morphology of Q235 steel and steel The corrosion products formed on the surface of the film integrity and compactness; Q235 steel buried in the film during the cathodic reaction oxygen depolarization reaction; soil moisture, Cl- and CO32-Q235 steel corrosion Leading role.