Experimental and computational study of a multi-active-site Schiff base as corrosion inhibitor of mild steel in 1 M HCl
Xiaolong Li
A B , Ting Long A , Qian Wu A , Chuan Lai A * , Yue Li A * , Junlan Li C , Boyan Ren A , Keqian Deng A , Chaozheng Long A and Shuting Zhao A
A
B
C
Abstract
In this study, the corrosion inhibition behavior of N,N′-(1,4-phenylene)bis(1,1-di(pyridin-2-yl)methanimine) (PBDPM) on mild steel in 1 M HCl at 30°C was evaluated under steady conditions. The corrosion inhibitor was synthesized by a one-step method. Electrochemical, energy dispersion spectrum (EDS) and water contact angle results revealed the adsorption behavior of the inhibitor at the metal–solution interface. The adsorption of PBDPM obeys the Langmuir adsorption isotherm. It is obvious that PBDPM exhibits good inhibition performance presumably due to its high surface coverage, as it forms a dense protective film on the surface of mild steel. The adsorption configuration and structure–activity relationships of the inhibitor were also explored theoretically by density functional theory (DFT) and molecular dynamics (MD), and the thermodynamic parameters and molecular active sites (the values of electrophilic attack and nucleophilic attack) were calculated.
Keywords: active sites, corrosion inhibitor, DFT, EDS, HCl, MD, mild steel, Schiff base.
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