Five-year atmospheric corrosion of cu, cr and ni weathering steels in a wide range of environments
Date
2018-06-29
2018-06-29
Author
Díaz, Iván
Cano Cuadro, Heidis Patricia
Lopesino, Patricia
De La Fuente García, Daniel
Chico, Belén
Jiménez, José A
Medina, S. F
Morcillo, Manuel
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Abstract
This work considers fourteen weathering steels manufactured by adding Cu, Cr and Ni alloying elements to extra mild steel. The steels were exposed for up to 5 years in different atmospheres. The atmospheric corrosion resistance of the steels was evaluated and the rust layers formed were characterised by X-ray diffraction, optical microscopy and scanning electron microscopy. The addition of Ni, particularly at 3.0 wt%, leads to a notable increase in corrosion resistance. The rusts formed contain lepidocrocite, goethite and spinel phases. X-ray diffraction also detected small amounts of kornelite (industrial atmosphere) and akaganeite (marine atmosphere).
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