摘要
采用电化学极化曲线方法、扫描电子显微镜 (SEM)研究了钼酸铵对铝合金在 3.5 % Na Cl溶液中的缓蚀作用 ,并讨论了钼酸铵对铝合金阴极作用系数、阳极作用系数与腐蚀电流的关系。实验结果表明 ,随着钼酸铵浓度的增大 ,缓蚀效率增大 ,达到一个最大值后基本保持不变。钼酸铵主要是通过抑制铝合金的阴极反应和阳极溶解来达到缓蚀作用的。 SEM实验表明 。
The inhibitive effect of ammonium heptamolybdate on LY12 alloy in 3.5%NaCl solution was studied by polarization curves and scanning electron microscopy technique. The relationship between the cathodic functional coefficient, anodic functional coefficient and the corrosion current was also discussed. The experimental results showed that the inhibtitive efficiency ( I E) increased with the increasing of ammonium heptamolybdate concrentration, after attaining a maximum I E maintained constant. The inhibitive effect resulted from inhibiting the anodic dissolution and the cathodic reaction of aluminium alloy. SEM experimental results showed that the ammonium heptamolybdate inhibited the pitting corrosion of aluminium alloy in 3.5%NaCl solution.
出处
《腐蚀与防护》
CAS
2001年第3期115-117,121,共4页
Corrosion & Protection
关键词
铝合金
钼酸铵
缓蚀作用
点蚀
缓蚀剂
Aluminium alloy
Ammonium heptamolybdate
Inhibitive effect
Pitting
