铝在碳酸钠溶液介质中的缓蚀研究

Corrosion Inhibition of Aluminium in Sodium Carbonate Solution

关键词:  铝  缓蚀  碳酸盐

Key words:  aluminium  corrosion inhibition  carbonate

摘要:

在0.1mol/L Na₂CO₃溶液中用失重法研究K₂CrO₄、Na₂SiO₃溶液及两者混合液对铝的缓蚀作用。在0.1mol/L Na₂CO₃溶液中分别添加浓度为0.01~0.05mol/L的K₂CrO₄和0.01~0.10mol/L的Na₂SiO₃,铝的缓蚀率分别为91.4%~95.0%和91.4%~97.1%。K₂CrO₄的适宜浓度是0.03mol/L,Na₂SiO₃的适宜浓度是0.08mol/L。在添加0.01mol/L的K₂CrO₄与0~0.04mol/L的Na₂SiO₃混合液条件下,铝的缓蚀率为91.4%~99.5%,其中0.01mol/L K₂CrO₄与0.02~0.03mol/L Na₂SiO₃的两种混合液均使缓蚀率达到98%以上,比单一缓蚀剂的效果好。

Abstract:

The corrosion inhibition of aluminium is studied by the method of loss of weight in the solution of 0.1 mol/L Na₂CO₃.The K₂CrO₄(0.01 to 0.05 mol/L),Na₂SiO₃(0.01 to 0.10 mol/L) and the mixed solution of K₂CrO₄(0.01 mol/L) and Na₂SiO₃(0 to 0.04 mol/L) are used as inhibitor. The inhibition rates of 91.4% to 95.0% and 91.4% to 97.1% against corrosion of aluminium are obtained respectively for K₂CrO₄ and Na₂SiO₃ in the tested concentrations.The favor concentrations of K₂CrO₄ and Na₂SiO₃ are 0.03 mol/L and 0.08 mol/L respectively.The inhibition rates of 91.4% to 99.5% are obtained in the addition of the mixed solution of 0.01 mo/L K₂CrO₄ and 0 to 0.04 mol/L Na₂SiO₃,in which over 98% is obtained for the mixed solutions of 01 mol/L K₂CrO₄ and 0.02 to 0.03 mol/L Na₂SiO₃,suggesting that the mixed inhibitors are better than the single inhibitor in corrosion inhibition.