Artículos de revistas
Corrosion properties of Fe-Cr-Nb-B amorphous alloys and coatings
Fecha
2014-09-15Registro en:
Surface & Coatings Technology. Lausanne: Elsevier Science Sa, v. 254, p. 238-243, 2014.
0257-8972
10.1016/j.surfcoat.2014.06.022
WOS:000340977300030
7193872294818689
0000-0002-5477-8139
Autor
Universidade Federal de São Carlos (UFSCar)
Univ Grenoble 1
CNRS
Universidade Estadual Paulista (Unesp)
Institución
Resumen
In the present work, we report on the corrosion properties of the Fe60Cr8Nb8B24 (at.%) alloy produced using pure and commercial materials in the following conditions: amorphous ribbons, partially crystallized ribbons and coatings produced by spray deposition and powder flame spraying process, in this case LVOF (low velocity oxygen fuel). The amorphous ribbons showed excellent corrosion resistance with formation of a stable passive film that ensured a very large passivation plateau. The (LVOF) coatings presented high fraction of amorphous phase with a layered structure, high porosity (16.2%) and low oxidation level (similar to 0.1%). The spray formed coatings presented crystalline structure with low porosity (1.9%) and low oxidation level (similar to 0.1%). The coatings showed higher corrosion current densities (up to two orders of magnitude) compared to the amorphous ribbons of the same composition for all pH. This deterioration in the corrosion properties were found to be impaired by the presence of crystalline phases. (C) 2014 Elsevier B.V. All rights reserved.