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Tarnishing film-induced brittle cracking of brass

Published online by Cambridge University Press:  31 January 2011

Cheng Zhang ,
Yan Jing Su ,
Li Jie Qiao  and
Wu Yang Chu
Yan Jing Su*
Affiliation:
Environment Fracture Lab of Education Ministry, Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
Wu Yang Chu
Affiliation:
Environment Fracture Lab of Education Ministry, Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: yjsu@mater.ustb.edu.cn
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Abstract

Tarnishing film was developed on the brass surface in Mattsson's solution at room temperature. The filmed brass was removed from the solution, dried, and subjected to a slow strain rate (loading speed = 0.5 mm/min) in air for studying the effect of the film on crack propagation in the brass substrate. It was observed that initial cracks started to emerge in the film and then propagated to the brass matrix in a brittle intergranular manner. However, it changed into a ductile mode after removing the deposited film. The galvanic current between platinum wire and filmed brass sample in Mattson's solution was investigated. The results showed that periodic current fluctuations were observed when the sample was under a constant applied load. These observations showed that the film rupture-formation occurred at cracks under the stress-corrosion cracking condition.

Keywords

FilmFractureNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 7 , July 2009 , pp. 2409 - 2415
Copyright
Copyright © Materials Research Society 2009

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