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Corrosion behavior of the bulk glassy (Fe44.3Cr5Co5Mo12.8Mn11.2C15.8B5.9)98.5Y1.5 alloy

Published online by Cambridge University Press:  31 January 2011

F. Gostin ,
U. Siegel ,
C. Mickel ,
S. Baunack ,
A. Gebert  and
L. Schultz
F. Gostin*
Affiliation:
IFW Dresden, D-01171 Dresden, Germany
U. Siegel
Affiliation:
IFW Dresden, D-01171 Dresden, Germany
C. Mickel
Affiliation:
IFW Dresden, D-01171 Dresden, Germany
S. Baunack
Affiliation:
IFW Dresden, D-01171 Dresden, Germany
A. Gebert
Affiliation:
IFW Dresden, D-01171 Dresden, Germany
L. Schultz
Affiliation:
IFW Dresden, D-01171 Dresden, Germany
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The free corrosion behavior and the anodic passivation ability of the bulk glassy (Fe44.3Cr5Co5Mo12.8Mn11.2C15.8B5.9)98.5Y1.5 alloy were fundamentally analyzed. Electrochemical tests were performed in aqueous solutions with pH values in the interval 0.3–14. Corrosion current densities are below 3 μA/cm2 in the entire studied pH interval; compared with commercial grade steels, for example, X210Cr12 steel, the glassy alloy has lower corrosion rates in acidic electrolytes and higher in basic solutions. The alloy exhibits high dissolution rates upon anodic polarization in acidic environments, but with increasing pH values it tends to form passive layers showing the lowest passive current density at pH 11. The passive layers consist mainly of Fe and Cr oxides. There is a strong variation of the passive layer structure and composition with pH. The protective effect of the grown surface layers is negatively influenced by sulfate ions.

Keywords

AmorphousCorrosionFe
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1471 - 1479
Copyright
Copyright © Materials Research Society 2009

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