Hydrogen-increased dezincification layer-induced stress and susceptibility to stress corrosion cracking of brass  

作　　者：李会录 高克玮 褚武扬 刘亚萍 乔利杰 

机构地区：[1]Department of Materials Physics, University of Science and Technology Beijing

出　　处：《中国有色金属学会会刊：英文版》2003年第2期353-357,共5页Transactions of Nonferrous Metals Society of China

基　　金：Project( 5 0 0 710 10 )supportedbytheNationalNaturalScienceFoundationofChina ;Project ( 19990 65 0 )supportedbytheSpecialFundsfortheMajorStateBasicResearchofChina

摘　　要：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.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.

关 键 词：黄铜 裂纹 应力腐蚀 SCC 氢 

分 类 号：TG172.2[金属学及工艺—金属表面处理]