Corrosion Research Laboratory, Department of Mechanical Engineering, Faculty of Engineering, Duzce University, Duzce, Turkey.
Department of Pharmacy, Health Services Vocational School, Sivas Cumhuriyet University, 58140, Sivas, Turkey.
Sci Rep. 2021 Apr 16;11(1):8353. doi: 10.1038/s41598-021-87858-9.
The corrosion inhibition behavior of sodium nitrite (NaNO) towards pure copper (99.95%) in simulated cooling water (SCW) was investigated by means of electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS). NaNO interferes with metal dissolution and reduce the corrosion rate through the formation or maintenance of inhibitive film on the metal surface. Surface morphologies illustrated that the surface homogeneity increased on adding sodium nitrite. Sodium nitrite's adsorption on copper surface followed the modified form of Langmuir, Freundlich and Frumkin isotherms. Physiosorption mode was involved in the corrosion protection. Electrochemical results revealed an corrosion resistance of copper increases on increasing the inhibitor concentration. The DEIS results indicated that copper corrosion mechanism could be hindered by 50% even after interval of 24 h by optimum concentration of sodium nitrite. The maximum inhibition was achieved with 2000 ppm of NaNO. With this concentration, inhibition efficiency of up to 61.8% was achievable.
采用电化学阻抗谱（EIS）和动态电化学阻抗谱（DEIS）研究了亚硝酸盐（NaNO）对模拟冷却水中纯铜（99.95%）的缓蚀行为。NaNO 通过在金属表面形成或维持抑制性膜来干扰金属溶解并降低腐蚀速率。表面形貌表明，添加亚硝酸盐后表面均匀性增加。NaNO 在铜表面的吸附遵循Langmuir、Freundlich 和 Frumkin 等温线的修正形式。物理吸附模式参与了腐蚀防护。电化学结果表明，随着抑制剂浓度的增加，铜的耐腐蚀性增加。DEIS 结果表明，即使经过 24 小时的间隔，最佳浓度的亚硝酸盐也能抑制铜腐蚀机制达 50%。在 2000ppm 的 NaNO 下达到最大抑制效果。在该浓度下，可达 61.8%的抑制效率。
