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Inhibition efficiency of pyrazinecarboxylic acid on mild steel in acidic environment
Journal of Adhesion Science and Technology ( IF 2.3 ) Pub Date : 2020-11-25 , DOI: 10.1080/01694243.2020.1850055
Ayşen Keleşoğlu 1 , Gökmen Sığırcık 1 , Reşit Yıldız 2, 3 , İlyas Dehri 1
Affiliation  

Abstract

Pyrazinecarboxylic acid (PCA) was examined as a potential corrosion inhibitor for mild steel (MS) in 0.5 M HCl environment. The methods of electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), as well potentiodynamic (PD) polarization were utilized. Furthermore, atomic force microscopy (AFM) and quantum chemical calculations were utilized. PD polarization curves demonstrated that PCA exhibited mixed inhibitor behavior. Scanning electron microscopy (SEM) offered the creation of an adsorptive layer on the surface of MS which prevented the steel against corrosive specimens. Furthermore, density functional theory (DFT) presented good agreement with electrochemical experimental results. The adsorption equilibrium constant (Kads) value was calculated to be 3.704 × 104 M−1 which was related to a high proportion of inhibitor on the surface. In the presence of 1.0 mM PCA, inhibition efficiency was determined as 95.2% from EIS results.



中文翻译:

酸性环境下吡嗪羧酸对低碳钢的缓蚀效率

摘要

在 0.5 M HCl 环境中,吡嗪甲酸 (PCA) 被用作低碳钢 (MS) 的潜在腐蚀抑制剂。利用电化学阻抗谱(EIS)、线性极化电阻(LPR)以及动电位(PD)极化的方法。此外,还使用了原子力显微镜 (AFM) 和量子化学计算。PD 极化曲线表明 PCA 表现出混合抑制剂行为。扫描电子显微镜 (SEM) 提供了在 MS 表面上形成的吸附层,可防止钢腐蚀试样。此外,密度泛函理论(DFT)与电化学实验结果非常吻合。吸附平衡常数 (广告) 值计算为 3.704 × 10 4 M -1这与表面上高比例的抑制剂有关。在 1.0 mM PCA 存在下,EIS 结果确定抑制效率为 95.2%。

更新日期:2020-11-25
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