稀土盐氯化铈、硝酸镧对防锈铝合金的缓蚀作用

Inhibition Effect of Cerium Chloride and Lanthanum Nitrate on Corrosion-resistance of Aluminum Alloy in 3.5% NaCl Solution

摘要: 采用失重法和电化学极化曲线研究了在3.5%氯化钠溶液中,两种稀土盐氯化铈和硝酸镧对防锈铝合金的缓蚀作用。结果表明,氯化铈和硝酸镧在NaCl介质中为阴极抑制型缓蚀剂; 在氯化钠溶液中添加低浓度的氯化铈和硝酸镧对铝合金具有较好的缓蚀作用,当浓度为1 g·L-1时缓蚀效果最好，缓蚀率排序为CeCl3>La(NO3)3。

Abstract: The corrosion inhibition of CeCl3 and La(NO3)3 on an autirust aluminum alloy in 3.5% NaCl solution was investigated by weight loss method and electrochemical polarization curves. The results show that both CeCl3 and La(NO3)3 are cathodic-type inhibitor in acidic media, and adding low concemtration of CeCl3 and La(NO3)3 have good effect on corrosion resistance of aluminum alloy in 3.5% NaCl solution. The best inhibition effect is at the concentration of 1.0 g·L-1. The inhibition efficiency of the inhibitors follows the order: CeCl3>La(NO3)3.