塔菲尔方程
吸附
腐蚀
介电谱
盐酸
电化学
朗缪尔吸附模型
壳聚糖
化学
核化学
碳钢
傅里叶变换红外光谱
无机化学
循环伏安法
材料科学
化学工程
有机化学
物理化学
工程类
电极
作者
Dheeraj Singh Chauhan,K.R. Ansari,Ahmad A. Sorour,M.A. Quraishi,Hassane Lgaz,R. Salghi
标识
DOI:10.1016/j.ijbiomac.2017.10.050
摘要
Organically functionalized chitosan macromolecules namely Chitosan-Thiosemicarbazide (CS-TS) and Chitosan-Thiocarbohydrazide (CS-TCH) were synthesized and evaluated as new corrosion inhibitors for mild steel corrosion in 1M HCl. The FTIR and 1H NMR studies confirmed the formation of the derivatives. The corrosion tests were performed using weight loss method, electrochemical measurements, surface morphology (AFM), quantum chemical investigation and molecular dynamics simulation methods. The maximum efficiency of 92% was obtained at a concentration as low as 200mgL-1. The inhibitors were found to obey Langmuir adsorption isotherm and exhibited both physical and chemical adsorption. Electrochemical impedance spectroscopy (EIS) results showed an increase in polarization resistance which supported the adsorption of inhibitors on the mild steel surface. Tafel data showed a mixed type behavior with cathodic predominance. The data of quantum chemical calculations and molecular dynamics simulation supported the experimental findings.
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