Table of Contents
International Journal of Metals
Volume 2014 (2014), Article ID 628505, 11 pages
http://dx.doi.org/10.1155/2014/628505
Research Article

Corrosion Behavior of Carbon Steel in Synthetically Produced Oil Field Seawater

Department of Metallurgical and Material Engineering, Jadavpur University, Kolkata 700032, India

Received 16 September 2014; Accepted 14 November 2014; Published 17 December 2014

Academic Editor: Chi Tat Kwok

Copyright © 2014 Subir Paul 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 life of offshore steel structure in the oil production units is decided by the huge corrosive degradation due to , S2−, and Cl, which normally present in the oil field seawater. Variation in pH and temperature further adds to the rate of degradation on steel. Corrosion behavior of mild steel is investigated through polarization, EIS, XRD, and optical and SEM microscopy. The effect of all 3 species is huge material degradation with FeSx and FeCl3 and their complex as corrosion products. EIS data match the model of Randle circuit with Warburg resistance. Addition of more corrosion species decreases impedance and increases capacitance values of the Randle circuit at the interface. The attack is found to be at the grain boundary as well as grain body with very prominent sulphide corrosion crack.