Abstract

The inhibition behaviour on mild steel (MS) of Robinia pseudoacacia leaves extract (RPLE) in different concentrations in 0.5 M HCl as a green corrosion inhibitor was investigated by using electrochemical techniques, surface analysis. Electrochemical ımpedance spectroscopy (EIS) measurements demonstrated that RPLE augments the char transfer resistance and then diminishes the double layer capacitance due to the creation of a deterrent layer on the MS with increasing concentration. Polarization measurements have shown that RPLE reducing both anodic and cathodic current density values is a mixed-type inhibitor. Also in with and without RPLE environments, the inhibition efficiencies have decreased with increasing temperature while the activation energy value increases with the addition of RPLE to acidic solution. Thermodynamic parameters (such as \(\Delta G_{\text{ads}}^{o}\) and K_ads) were obtained from electrochemical measurements. Adsorption of RPLE components on MS has been descriptived of FT-IR (Fourier Transform İnfrared Spectroscopy) and SEM (Scanning Electron Microscopy) data confirming the entity of a obstacle film on MS.

Graphic Abstract

摘要

采用电化学技术，表面分析技术研究了0.5M HCl中绿色浓度的刺槐叶片提取物（RPLE）对低碳钢（MS）的缓蚀行为。电化学阻抗谱（EIS）测量表明，RPLE会增加炭转移电阻，然后减小双层电容，这是因为在MS上随着浓度的增加会形成阻吓层。极化测量表明，RPLE同时降低阳极和阴极电流密度值是一种混合型抑制剂。同样，在有和没有RPLE环境下，随着温度的升高，抑制效率也随之降低，而向酸性溶液中添加RPLE，则活化能值随之增加。热力学参数（例如从电化学测量获得了\（\ Delta G _ {\ text {ads}} ^ {o} \）和K _ads）。RPLE成分在MS上的吸附已通过FT-IR（傅里叶变换红外光谱）和SEM（扫描电子显微镜）数据进行了描述，证实了MS上障碍膜的实体。

图形摘要