聚天冬氨酸对铜、碳钢缓蚀性能的影响

采用失重法研究了pH=7.5的自来水中聚天冬氨酸和苯骈三唑、钼酸钠、硅酸钠复配时对铜和碳钢-铜复合体系的缓蚀效果,试验表明:单一聚天冬氨酸和钼酸钠的缓蚀效果随其浓度的增加而增加;单一苯骈三唑的缓蚀效果随其浓度的增加其缓蚀性也增加,当浓度达3 mg/L时,缓蚀效果最佳;单一硅酸钠的缓蚀效果随其浓度的增加其缓蚀性也增加,当浓度达200 mg/L时,缓蚀效果最佳;在缓蚀剂总浓度为50.5 mg/L时4种药剂复配,显示出较好的协同效应,其最佳配比为10 mg/L聚天冬氨酸 0.5 mg/L苯骈三唑 10 mg/L钼酸钠 30 mg/L硅酸钠.电化学动电位极化曲线测试结果表明复合水处理剂对阳极、阴极均有缓蚀作用.

Corrosion Inhibition Behavior of Copper and Carbon Steel by Polyaspartic Acid

The synergistic inhibition effect of polyaspartic acid, benzoyltrifluoroacetone (BTA), sodium molybdate (Na_2MoO_4), and sodium silicate (Na_2SiO_3) in the tap water of pH=7.5 for copper carbon steel copper composite system was studied using weight loss method. Results showed that the inhibition effect of the polyaspartic acid or Na_2MoO_4 alone increased with increasing concentration of the inhibitor, so did the inhibitors BTA and Na_2SiO_3. The optimal inhibition performance for individual inhibitor was attained while the BTA concentration was kept as 3 mg/L or the Na_2SiO_3 concentration as 200 mg/L. There existed good synergistic inhibition effect when the four inhibitors were used as the complex inhibitors at a total inhibitor concentration of 50.5 mg/L, and the optimal composition for the complex inhibitor was recommended as 10 mg/L polyaspartic acid, 0.5 mg/L BTA, 10 mg/L Na_2MoO_4, and 30 mg/L Na_2SiO_3. The electrochemical potentiodynamic polarization curves proved that the complex water treatment agent had inhibition effect for both the anodic and cathodic processes.