ABSTRACT

The corrosion inhibition of carbon steel was investigated in cooling water containing sodium octanoate (Oct), Zn-salts or blends of Oct-Zn salts. The weight loss and the potentiodynamic polarization methods were applied. ZnCl₂, ZnSO₄ and Zn (NO₃)₂ were studied. The results showed that Oct-Zn salt blends exhibited higher corrosion inhibition efficiency than either Oct or Zn Salts added separately to the cooling water suggesting a synergistic interaction between Oct and the Zn-salts. The polarization results revealed that these blends act as mixed-type inhibitors with three dominant anodic inhibition. The inhibition efficiency of Zn-salts in the absence and presence of Oct was found to decrease in the order Zn (NO₃)₂ > ZnSO₄ > ZnCl₂. Optical microscopy and infrared spectroscopy were used to study the protective action of the films formed on carbon steel in Oct-Zn salt blends. The role of Zn anions and the synergism behavior were discussed.

摘要

在含有辛酸钠（Oct），锌盐或Oct-Zn盐混合物的冷却水中研究了碳钢的腐蚀抑制作用。应用了重量损失和电位动力学极化方法。研究了ZnCl ₂，ZnSO ₄和Zn（NO ₃）₂。结果表明，与分别添加到冷却水中的Oct或Zn盐相比，Oct-Zn盐共混物表现出更高的腐蚀抑制效率，表明Oct和Zn盐之间具有协同作用。极化结果表明，这些共混物可作为具有三种主要阳极抑制作用的混合型抑制剂。发现在不存在和存在Oct的情况下，对锌盐的抑制效率按Zn（NO ₃）₂ > ZnSO ₄ > ZnCl ₂。使用光学显微镜和红外光谱研究了在Oct-Zn盐混合物中碳钢上形成的膜的保护作用。讨论了锌阴离子的作用和协同行为。