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通过电化学极化曲线方法和电化学阻抗(EIS) 研究了碳族元素含氧酸盐对铝合金在3 .5 % ( 文中所叙述的3-5 % 的NaCl 均指质量分数,以下不再另注)NaCl 溶液中的缓蚀作用.实验结果表明,在氯化钠溶液中添加低浓度的碳酸钠和硅酸钠及高浓度的硅酸钠对铝合金具有较好的缓蚀作用,而添加低浓度的碳酸氢钠后缓蚀效率却很低,甚至没有缓蚀作用.碳酸钠和硅酸钠对铝合金的缓蚀作用是通过抑制铝合金的阴极反应和阳极反应,在铝合金的表面形成不溶的沉淀膜和pH 效应实现的.碳酸钠在一定程度上能够提高铝合金的抗点蚀的能力.
Electrochemical polarization curves and electrochemical impedance spectroscopy (EIS) have been used to investigate the effect of the oxoacids on aluminum alloys. 5% (3-5% described in the text refers to the mass fraction of NaCl, the following will not be another note) corrosion inhibition in NaCl solution. The experimental results show that adding sodium carbonate and sodium silicate with low concentration and sodium silicate with high concentration in sodium chloride solution have a good corrosion inhibition effect on the aluminum alloy. However, after adding sodium bicarbonate with low concentration, the corrosion inhibition efficiency But it is very low, even without corrosion inhibition. The corrosion inhibition effect of sodium carbonate and sodium silicate on the aluminum alloy is achieved by inhibiting the cathodic reaction and the anodic reaction of the aluminum alloy to form an insoluble precipitated film on the surface of the aluminum alloy and the pH effect. To a certain extent, sodium carbonate can improve the anti-pitting ability of aluminum alloy.