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International Journal of Corrosion
Volume 2012, Article ID 162729, 11 pages
http://dx.doi.org/10.1155/2012/162729
Research Article

Analysis of Short-Term Steel Corrosion Products Formed in Tropical Marine Environments of Panama

1Departamento de Química Física, CITEN, Lab. No. 105, Edificio de Laboratorios Científicos-VIP, Universidad de Panamá, Panama, Panama
2Laboratorio de Análisis Industriales y Ciencias Ambientales, Universidad Tecnológica de Panamá, Panama, Panama

Received 24 May 2012; Revised 20 June 2012; Accepted 4 July 2012

Academic Editor: Flavio Deflorian

Copyright © 2012 Juan A. Jaén 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

A low-carbon steel A-36 and two conventional weathering steels A-588 and COR-420 exposed at four atmospheric test stations located in (i) Tocumen, an urban site near the Pacific Ocean, (ii) Sherman-Open, (iii) Sherman-Coastal, and (iv) Sherman-Breakwater on the Caribbean coast of Panama. Kinetics of the short-term atmospheric corrosion process and the relationship with exposure time and environmental characteristics of each site were investigated. The atmospheric exposure conditions, particularly the time of wetness, deposition of chloride, and the washing effect of contaminants on the metal surface by rain are of upmost importance in determining the corrosion behaviour and composition of rust. The corrosion products were mainly identified using room temperature and low temperature (80 K) Mössbauer spectroscopy, FTIR, and X-ray powder diffraction. In all samples, γ-FeOOH and α-FeOOH were the main constituents. Maghemite (γ-Fe2O3), magnetite (Fe3O4), and Akaganeite (β-FeOOH) were also identified.