Table of Contents
ISRN Materials Science
Volume 2011 (2011), Article ID 167487, 6 pages
http://dx.doi.org/10.5402/2011/167487
Research Article

Evaluation of Nitrilotrimethylene Phosphonic Acid and Nitrilotriacetic Acid as Corrosion Inhibitors of Mild Steel in Sea Water

1Department of Chemistry, VSS University of Technology, Burla, Orissa 768018, India
2Department of Chemistry, University of Delhi, Delhi 110007, India

Received 12 June 2011; Accepted 7 July 2011

Academic Editors: F. Cabrera-Escribano and K. Kusabiraki

Copyright © 2011 P. K. Kar and Gurmeet Singh. 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 inhibition efficiency of nitrilotrimethylene phosphonic acid (NTP) in controlling mild steel corrosion in sea water has been evaluated by galvanostatic polarization, electron scanning for chemical analysis (ESCA), and scanning electron microscope (SEM) methods. The results are compared with those obtained for nitrilotriacetic acid (NTA). NTP is found to be more effective in protecting mild steel against sea water corrosion as compared to NTA. The surface of mild steel in presence and absence of NTP and NTA is characterized by ESCA and SEM. From the ESCA studies, it is found that NTP formed a stable and compact film over the mild steel.