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Journal of Chemistry
Volume 2013, Article ID 370821, 9 pages
http://dx.doi.org/10.1155/2013/370821
Research Article

A Characteristic Investigation of Aminocyclohexane-N′-methylurea as a Corrosion Inhibitor for Mild Steel in 1 N H2SO4

1Department of Chemistry, Gnanamani College of Engineering, Pachal Post, Tamilnadu, Namakkal 637018, India
2Department of Chemistry, Government College of Engineering, Tamilnadu, Salem 636001, India
3Department of Chemistry, Gnanamani College of Technology, Pachal Post, Tamilnadu, Namakkal 637018, India

Received 14 December 2011; Revised 12 June 2012; Accepted 14 June 2012

Academic Editor: Sylvain Franger

Copyright © 2013 P. Thiraviyam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.