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

摘要

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.