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通过动电位扫描,微区电位扫描,电化学阻抗谱及XPS等技术,考察了Na_2MoO_4和三乙醇胺(TEA)复配缓蚀剂对Q235碳钢孔蚀的抑制作用。结果表明:Q235碳钢在0.02 mol/L NaCl+0.1 mol/L NaHCO_3溶液中,适量的Na_2MoO_4与TEA复配对其孔蚀的抑制作用要优于单独使用Na_2MoO_4对孔蚀的抑制效果。在外加恒电位为0.3 V时,在实验溶液中碳钢表面有活性点被激活,Na_2MoO_4+TEA复配缓蚀剂能够明显抑制表面活性点的生成,并且能使形成的活性点的电位峰值迅速降低,抑制其向腐蚀小孔的转化。在加有Na_2MoO_4+TEA复配缓蚀剂的实验溶液中形成的缓蚀膜主要成分为Fe_2(MoO_4)_3,Fe_2O_3和TEA,三乙醇胺的吸附可以改善钼酸盐缓蚀膜的致密性,进一步提高缓蚀性能。
The effects of Na 2 MoO 4 and triethanolamine (TEA) mixed corrosion inhibitors on pitting corrosion of Q235 carbon steel were investigated by potentiodynamic scanning, micro-potential scan, electrochemical impedance spectroscopy and XPS. The results show that the inhibition of pitting corrosion of Q235 carbon steel in 0.02 mol / L NaCl + 0.1 mol / L NaHCO3 solution is better than that of Na2MoO4 alone. When the constant potential is 0.3 V, the active sites on the surface of the carbon steel are activated in the experimental solution. The corrosion inhibitor Na 2 MoO 4 + TEA can obviously inhibit the generation of the surface active sites and can rapidly form the potential peak of the active sites Reduce, inhibit its conversion to corrosion holes. The main corrosion inhibition film formed in the experiment solution with Na_2MoO_4 + TEA compound corrosion inhibitor is Fe_2 (MoO_4) _3, Fe_2O_3 and TEA. The adsorption of triethanolamine can improve the densification of molybdate corrosion inhibitor. Improve corrosion inhibition.