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Chemical characteristics of the passive surface films formed on newly developed Cu–Zr–Ag–Al bulk metallic glasses

Published online by Cambridge University Press:  31 January 2011

C.L. Qin ,
W. Zhang ,
Q.S. Zhang ,
K. Asami  and
A. Inoue
C.L. Qin*
Affiliation:
WPI Advanced Institute for Materials Research, Tohoku University, Aoba-ku, Sendai 980-8577, Japan
W. Zhang
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Q.S. Zhang
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
K. Asami
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this paper, we systematically demonstrate the corrosion behavior and surface characteristics of a newly developed Cu36Zr48Ag8Al8 bulk metallic glass (BMG). The Cu36Zr48Ag8Al8 BMG exhibits excellent corrosion resistance in acidic and alkaline solutions without Cl− ions. The alloy is spontaneously passivated with a markedly low current density in 1 N H2SO4 solution. The formation of the bilayered passive film of the present alloy immersed in 1 N H2SO4 solution, which is composed mostly of Zr4+ cations in the exterior part and Zr4+- and Al3+-enriched cations in the inner part, could be responsible for the high corrosion resistance.

Keywords

AmorphousCorrosionX-ray photoelectron spectroscopy (XPS)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 8 , August 2008 , pp. 2091 - 2098
Copyright
Copyright © Materials Research Society 2008

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References

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