Diffusion mechanism of dezincification in double phase brass exposed to seawater  

作　　者：Liu Zengcai(刘增才)  Lin Leyun(林乐耘)  Liu Shaofeng(刘少峰)  Zhao Yuehong(赵月红) 

机构地区：[1]Gen Res Inst NonFerrous Met, Beijing 100088, Peoples R China

出　　处：《中国有色金属学会会刊：英文版》1999年第3期572-577,共6页Transactions of Nonferrous Metals Society of China

摘　　要：Zinc diffusion kinetics of double phase brass as they were corroded in seawater was investigated by means of metallography microscope and mathematics regression analysis. The results showed that, the dezincification corrosion of β phase continuous HMn58 2 brass is characterized by β phase volume diffusion, while that of α phase continuous HSn62 1 brass is controlled by α phase grain boundary diffusion. Apparent diffusion coefficients of zinc in both types alloys were calculated out by founding diffusion equation and boundary conditions. It was found that the value of theoretical calculation is close to that of experimentally measured, and it confirmed that Sn element inhibits dezincification of brass. The relativity between the dezincification depth and corrosion rate of different double phase brasses immersed in seawater was revealed. : Zinc diffusion kinetics of double phase brass as they were corroded in seawater was investigated by means of metallography microscope and mathematics regression analysis. The results showed that, the dezincification corrosion of β phase continuous HMn58 2 brass is characterized by β phase volume diffusion, while that of α phase continuous HSn62 1 brass is controlled by α phase grain boundary diffusion. Apparent diffusion coefficients of zinc in both types alloys were calculated out by founding diffusion equation and boundary conditions. It was found that the value of theoretical calculation is close to that of experimentally measured, and it confirmed that Sn element inhibits dezincification of brass. The relativity between the dezincification depth and corrosion rate of different double phase brasses immersed in seawater was revealed.Zinc diffusion kinetics of double-phase brass as they were corroded in seawater was investigated by means of metallography microscope and mathematics regression analysis. The results showed that, the dezincification corrosion of beta-phase continuous HMn58-2 brass is characterized by beta-phase volume diffusion, while that of alpha-phase continuous HSn62-1 brass is controlled by alpha-phase grain boundary diffusion. Apparent diffusion coefficients of zinc in both types alloys were calculated out by founding diffusion equation and boundary conditions. It was found that the value of theoretical calculation is close to that of experimentally measured, and it confirmed that Sn element inhibits dezincification of brass. The relativity between the dezincification depth and corrosion rate of different double-phase brasses immersed in seawater was revealed.

关 键 词：seawater corrosion BRASS DEZINCIFICATION BOUNDARY DIFFUSION 

分 类 号：TG172[金属学及工艺—金属表面处理]