Diffusion mechanism of dezincification in double-phase brass exposed to seawater

来源期刊：中国有色金属学报(英文版)1999年第3期

论文作者：刘增才 林乐耘 刘少峰 赵月红

文章页码：572 - 577

Key words：seawater corrosion; brass; dezincification; boundary diffusion

Abstract: 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 ofβ-phase continuous HMn58-2 brass is characterized byβ-phase volume diffusion, while that ofα-phase continuous HSn62-1 brass is controlled byα-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.