Table of Contents
Journal of Metallurgy
Volume 2012 (2012), Article ID 723687, 13 pages
http://dx.doi.org/10.1155/2012/723687
Research Article

Effect of Diacetyl Monoxime Thiosemicarbazone on the Corrosion of Aged 18 Ni 250 Grade Maraging Steel in Sulphuric Acid Solution

1Department of Science and Humanities, PESIT, Bangalore 560085, India
2Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, Karnataka 75025, India
3Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, Karnataka 575025, India

Received 31 July 2012; Accepted 6 November 2012

Academic Editor: Sunghak Lee

Copyright © 2012 T. Poornima 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 corrosion inhibition of the aged 18 Ni 250 grade maraging steel in 0.5 M sulphuric acid by diacetyl monoxime thiosemicarbazone (DAMTSC) at 303–323 K has been investigated by potentiodynamic polarization, EIS, and SEM techniques. Good inhibition efficiency of DAMTSC was revealed even at low concentrations, which increased with the increase in DAMTSC concentration and decreased with the increase in temperature. The activation energies, , as well as other thermodynamic parameters ( ; ; ), were evaluated and discussed. The adsorption of DAMTSC on the aged maraging steel surface was found to obey the Langmuir adsorption isotherm model and shows mixed type inhibition behavior.