论文部分内容阅读
应用动电位极化、Mott-Schottky曲线测试和XPS测试等方法研究了含0.05 mol/L Cl-,p H值为11的混凝土模拟孔隙液中常用缓蚀剂亚硝酸盐对Q235碳钢小孔腐蚀早期行为的影响。结果显示,NO2-对稳定孔蚀和亚稳态孔蚀均有很好的抑制作用,亚稳态孔蚀电位和稳定孔蚀电位均随着NO2-浓度的增加而增大,且影响趋势接近。NO2-浓度较低时,对孔蚀的抑制作用很明显,超过0.03 mol/L后抑制作用变化不大。这是因为,NO2-浓度增大,钝化膜中更多的Fe2+被氧化为Fe3+,膜中的氧空位缺陷浓度降低,因此小孔的形核受到抑制。
Mott-Schottky curve test and XPS test were used to study the effect of nitrite, a common corrosion inhibitor in concrete simulated pore fluid containing 0.05 mol / L Cl- and p H 11, on the pores of Q235 carbon steel Corrosion of early behavior. The results show that NO2- has a good inhibition effect on both stable pitting corrosion and metastable pitting corrosion. Both metastable pitting potential and steady pitting corrosion potential increase with the increase of NO2- concentration, and the influence trend is close . The inhibition effect of pitting corrosion is obvious when NO2- concentration is low, and the inhibition effect after 0.03 mol / L little change. This is because, as NO2- concentration increases, more Fe2 + in the passivation film is oxidized to Fe3 +, the concentration of oxygen vacancy defects in the film decreases, and the nucleation of the pores is suppressed.