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NO2-及其浓度对混凝土模拟孔隙液中碳钢早期孔蚀的作用

DOI: 10.11903/1002.6495.2014.149, PP. 123-128

Keywords: 碳钢,混凝土模拟孔隙液,孔蚀,亚稳态孔蚀,NO2-

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Abstract:

应用动电位极化、Mott-Schottky曲线测试和XPS测试等方法研究了含0.05mol/LCl-,pH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0.03mol/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。

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