Corrosion inhibition of aluminium in hydrochloric acid medium using cimetidine as inhibitor: empirical and optimization studies

Abstract

Purpose The purpose of this study was to investigate cimetidine as corrosion inhibitor of aluminium in hydrochloric acid medium. Design/methodology/approach Cimetidine was characterized by gas chromatography mass spectrophotometer and Fourier transform infrared spectroscopy to determine its chemical composition and functional groups, respectively. Gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopic techniques were used in the corrosion inhibition process. Thermodynamic and adsorption parameters were evaluated. And response surface methodology was used to optimize the corrosion inhibition process. Findings Analysis of the results revealed that major constituents of cimetidine include metronidazole, n-hexadecanoic acid cyclohexane and methyl ester. It has C-H stretch, C = N stretch, CH3C-H bend, ring C = C stretch, -C-O-O stretch, N-H bend, C-O stretch and C-H bend as predominant functional groups. Adsorption of molecules of the inhibitor on the aluminium surface was spontaneous, and it followed mechanism of physical adsorption. Response surface methodology revealed that quadratic model adequately described the inhibition efficiency of cimetidine as function of inhibitor concentration, temperature and time. Chemical and electrochemical results are in agreement that the cimetidine is a viable corrosion inhibitor. Cimetidine was revealed as mixed-type inhibitor because it controlled both cathodic and anodic reactions. Originality/value Empirical and optimization studies of cimetidine drug as corrosion inhibitor of aluminium in hydrochloric acid medium were carried out. The research results can provide the basis for deploying drugs (with mucosal protective and antacid properties) for corrosion control of metallic structures.

Testing the inhibition efficiency of the castor oil leaf as corrosion inhibitor of mild steel in H2SO4

“…It can also be credited to the rise in the solubility of the protective films. These findings are in agreement with previous research reports [ 22 , 23 , 31 ].

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“…PDP was used to identify the types of inhibitors that castor oil leaf has. Potentiodynamic polarization study was carried out according to the method used by previous research reports [ 12 , 27 , 31 ]. It was conducted with the aid of potentiostat/galvanostat 263 electrochemical workstation.…”

Examining the effectiveness of Guava leaf extract in mitigating corrosion of aluminium in potassium hydroxide solution

“…It corrodes when it has a chemical or electrochemical reaction with its surroundings. Corrosion occurs when a metal degrades due to an electrochemical reaction with its environment, hinders the effectiveness of aluminum (Onukwuli et al, 2021;Udeh et al, 2021a). It is a transformation of metallic structures into other chemical structures, most often through the intermediary of a third structure.…”