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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Hydrogen-increased dezincification layer-induced stress and susceptibility to stress corrosion cracking of brass
LI Hui-lu(李会录), GAO Ke-wei(高克玮), CHU Wu-yang(褚武扬)
LIU Ya-ping(刘亚萍), QIAO Li-jie(乔利杰) 

Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China

Abstract:Dezincification layer formed during corrosion or stress corrosion cracking (SCC) of brass in an ammonia solution could induce an additive stress. The effect of hydrogen on the dezincification layer-induced stress and the susceptibility to SCC were studied. The dezincification layer-induced stress was measured using the deflection method and the flowing stress differential method, respectively. The latter measures the difference between the flowing stress of a specimen before unloading and the yield stress of the same specimen after unloading and forming a dezincification layer. The susceptibility to SCC was measured using slow strain rate test. Results show that both the dezincification layer-induced stress and the susceptibility to SCC increase with increasing hydrogen concentration in a specimen. This implies that hydrogen-enhanced dezincification layer-induced stress is consistence with the hydrogen-increased susceptibility to SCC of brass in the ammonia solution.

 

Key words:  hydrogen; dezincification layer-induced stress; stress corrosion cracking; brass

ISSN 1672-7029
CN 43-1423/U

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