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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 3    September 1999

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Diffusion mechanism of dezincification in double-phase brass exposed to seawater
Liu Zengcai(刘增才), Lin Leyun(林乐耘), Liu Shaofeng(刘少峰), Zhao Yuehong(赵月红)

General Research Institute for Nonferrous Metals, Beijing100088, P.R.China

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.

 

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

ISSN 1672-7029
CN 43-1423/U

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