Characterization of corrosion products formed on Ni 2.4 wt%–Cu 0.5 wt%–Cr 0.5 wt% weathering steel exposed in marine atmospheres

• DOI: 10.1016/j.corsci.2014.07.011
• Publication Date: 2014-07-12T13:46:25Z
• Authors: Heidis Cano; Delphine Neff; Manuel Morcillo; Philippe Dillmann; Iván Diaz; Daniel de la Fuente
• Keywords: Weathering steel; Lepidocrocite; Maghemite; High-Temperature Corrosion; Characterization

The authors gratefully acknowledge the financial support for this study from the Ministry of Science and Innovation of Spain (CICYT-MAT 2008-06649). They also thank Laboratoire “Archéomatériaux et Prévision de l’Altération” (LAPA) for the help offered. H. Cano and I. Díaz also acknowledge the PhD scholarships financed by FPI/MINECO and CSIC JAE Programme respectively.<br/>Weathering steel manufactured with high concentrations of copper (0.5. wt%), chromium (0.5. wt%) and nickel (2.4. wt%) was studied with the aim of furthering knowledge on corrosion product characterization and performance in marine environments. Specimens exposed for two years in a rural atmosphere and two marine environments were characterized by optical microscopy, SEM/EDS, XRD and Raman spectroscopy and corrosion rates measured. The main phases found were ferrihydrite, maghemite and goethite in the inner corrosion layer, and lepidocrocite in the outer layer. Cu and Ni were homogeneously distributed while Cr tended to be concentrated in the inner layer. © 2014 Elsevier Ltd.<br/>Peer Reviewed<br/>