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Influence of hydrogen on the 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
Cheng Zhang
Affiliation:
Environment Fracture Lab of Education Ministry, Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China
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
Li jie Qiao
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:
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Abstract

The effects of hydrogen-charging on tarnishing film-induced brittle cracking of brass were studied. The tarnishing film was generated on brass samples with various hydrogen concentrations in Mattsson’s solution, then removed from the solution, dried, and subjected to a slow loading rate (loading speed = 0.5 mm/min) in air. The results indicated that hydrogen caused the film-induced brittle cracking to be more difficult to occur and a considerably high concentration of hydrogen could inhibit completely the film-induced brittle cracking. Elastic modulus test results showed that elastic modulus of the brass substrate decreased and elastic modulus of the tarnishing film increased with increasing the hydrogen concentration. Hydrogen inhibiting the film-induced cracking can be ascribed to the fact that hydrogen changed the elastic modulus of substrate and film.

Keywords

FilmFractureH
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3432 - 3438
Copyright
Copyright © Materials Research Society 2009

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