实海暴露双相黄铜脱锌的扩散机制  

DIFFUSION MECHANISM OF DEZINCIFICATION IN DOUBLE-PHASE BRASS EXPOSED TO SEAWATER

作　　者：刘增才[1] 林乐耘[1] 徐杰[1] 赵月红[1] 

机构地区：[1]北京有色金属研究总院,100088

出　　处：《材料研究学报》2000年第B01期145-149,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金!59671059.

摘　　要：研究了不同相结构双相黄铜的扩散机制，计算出黄铜在实海暴露过程中锌在β相的体扩散系数和α相晶界的扩散系数证实了合金元素 Ｓｎ对黄铜脱锌的抑制作用，揭示出脱锌深度与腐蚀速度之间的相关性．Zinc diffusion kinetics of double-phase brass corroded in seawater has been investigated by means of metallography microscope and mathematics regression analysis. The results showed that dezincification corrosion ofβ-phase continuous HMn58-2 brass was characterized by β-phase volume diffusion, while that ofα-phase continuous HSn62-1 brass was controlled by a-phase grain boundary diffusion. Apparent diffusion. coefficients of zinc in both types of alloys were calculated out by founding diffusion equation and boundary conditions. It was found that the value of theoretical calculation was close to that of experimentally measured, and it was confirmed that Sn element inhibited 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：实海暴露 双相黄铜 脱锌腐蚀 腐蚀速度 扩散机制 沿晶扩散 扩散系数 

分 类 号：TG171[金属学及工艺—金属表面处理] TG172.5[金属学及工艺—金属学]