Adsorption and inhibition mechanism of efficient and environment friendly corrosion inhibitor for mild steel: Experimental and theoretical study

The newly synthesized aminocyclohexane-N′-methylurea Mannich base was characterised using FT-IR, H1NMR, and C13NMR spectra and also it was tested as corrosion inhibitor for the mild steel in 1 N sulphuric acid. Inhibitive study of this compound was carried out by weight loss method over the temperature range of 303–333 K, potentiodynamic polarisation, and AC impedance methods. The inhibition efficiency was increased with increasing concentration of inhibitor whereas it was decreased with increasing temperature. Potentiodynamic polarisation study showed that ACMU is a mixed type inhibitor. AC Impedance study reveals that the corrosion of steel was mainly controlled by a charge transfer process. Surface analysis was carried out using SEM technique. The adsorption of inhibitor follows the Tempkin and Langmuir adsorption isotherms. The activation energy(Ea), free energy change (ΔGads), enthalpy change (ΔHads) and entropy change (ΔSads) were calculated to understand the corrosion inhibition mechanism.

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Experimental and theoretical study on amino acid derivatives as eco-friendly corrosion inhibitor on mild steel in hydrochloric acid solution

Journal of Adhesion Science and Technology ◽

10.1080/01694243.2014.884754 ◽

2014 ◽

Vol 28 (11) ◽

pp. 1072-1089 ◽

Cited By ~ 23

Author(s):

Mahendra Yadav ◽

Sushil Kumar ◽

Laldeep Gope

Keyword(s):

Amino Acid ◽

Hydrochloric Acid ◽

Acid Solution ◽

Mild Steel ◽

Corrosion Inhibitor ◽

Hydrochloric Acid Solution ◽

Theoretical Study ◽

Amino Acid Derivatives

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Inhibition of three kinds of expired nitroimidazole antibiotics

Anti-Corrosion Methods and Materials ◽

10.1108/acmm-02-2018-1897 ◽

2018 ◽

Vol 65 (4) ◽

pp. 398-407 ◽

Cited By ~ 2

Author(s):

Yulu Shi ◽

Wei Bai ◽

Junming Guo ◽

Libin Gao ◽

Yijian Chen ◽

...

Keyword(s):

Mild Steel ◽

Corrosion Inhibitor ◽

Energy Dispersive Spectrometer ◽

Electrochemical Techniques ◽

Inhibition Mechanism ◽

Mechanism Analysis ◽

Content Type ◽

Theoretical Support ◽

Maximum Value ◽

Experimental Structure

Purpose This paper aims to evaluate the efficiency and mechanism of three kinds of expired nitroimidazole antibiotics as corrosion inhibitor for mild steel in 1M HCl. Design/methodology/approach Evaluation was carried out by weight loss and electrochemical techniques. The surface morphology and the composition of the elements of adsorption layer are studied by scanning electron microscopy and energy dispersive spectrometer. Findings The experimental results reveal that the maximum value of inhibition efficiency appear at an extreme point of concentration with the increase of concentration of the inhibitors. Ornidazole has better corrosion inhibition than metronidazole but not as tinidazole. The inhibitors all act as cathodic type corrosion inhibitor. The adsorption of ornidazole, metronidazole and tinidazole on mild steel obeys Langmuir adsorption isotherm and belongs to chemisorption of electron donating. Combined with the molecular structure of the corrosion inhibitor and the experimental structure, the authors propose a detailed mechanism analysis. Originality/value The expired nitroimidazole antibiotics as corrosion inhibitor for mild steel in hydrochloric acid solution is first studied. It provides a way to deal with expired drugs, thereby reducing environmental pollution. The study explored the inhibition mechanism affecting by comparison different structure of three kinds of expired nitroimidazole antibiotics molecular, providing theoretical support for the preparation of the new inhibitor.

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