稀土离子和香兰素在H_2SO_4溶液中对冷轧钢的缓蚀协同效应

Synergistic Inhibition Effect of Rare Earth Ions and Vanillin on Corrosion of Cold Rolled Steel in H_2SO_4 Solution

用失重法研究了四种稀土离子(La3+,Ce3+,Ce4+,Nd3+)和香兰素(4-羟基-3-甲氧基-苯甲醛)在1.0 mol/LH2SO4介质中对冷轧钢的缓蚀协同效应。结果表明,香兰素对冷轧钢有中等程度的缓蚀作用,缓蚀率随其浓度的增加而增大;四种稀土离子对冷轧钢的缓蚀作用均较差,最大缓蚀率仅为20%左右。香兰素和稀土Ce4+复配后对冷轧钢产生了明显的缓蚀协同效应,最大缓蚀率可达95%左右;而与La3+,Ce3+和Nd3+复配后均无缓蚀协同效应。

The synergistic inhibition effect of four rare earth ions （La3^＋ , Ce3^＋, Ce3^＋, Nd3^＋ ） and vanillin （4-hydroxy- 3-methoxy-benzaldehyde） on the corrosion of cold rolled steel （CRS） in 1. 0 mol/L H2SO4 solution was studied by weight loss method. The present study revealed that vanillin had a moderate inhibitive effect on the corrosion of CRS in 1. 0 mol/L H2SO4 solution, and the inhibition efficiency increased with the concentration. The rare earth ions of La3^＋ ,Ce3^＋ ,Ce4^＋ and Nd3^＋ had a negligible effect in 1.0 mol/L H2SO4, and the maximum inhibition efficiency was not more than 20%. The experiments of incorporation of rare earth ions and vanillin, indicated that Ce4^＋ and vanillin produced strong synergistic effect on corrosion inhibition for CRS, and the maximum inhibition efficiency was about 95%. However, there was no synergistic inhibition effect between other rare earth ions （La3^＋ ,Ce3^＋ and Nd3^＋ ） and vanillin.