Effects of dust and salt particles on the formation and spreading of micro-droplets on AZ91 magnesium alloy

被引：26

作者：

Chen, Jian ^{[1
]}

Wang, Jianqiu ^{[1
]}

Han, Enhou ^{[1
]}

Ke, Wei ^{[1
]}

机构：

[1] Chinese Acad Sci, Environm Corros Ctr, Inst Met Res, Shenyang 110016, Peoples R China

来源：

CORROSION SCIENCE | 2008年 / 50卷 / 05期

基金：

中国国家自然科学基金;

关键词：

AZ91 magnesium alloy; in situ; environmental scanning electron microscope;

D O I：

10.1016/j.corsci.2008.01.027

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The effects of dust and salt particles on the formation and spreading of micro-droplets on as-cast AZ91 magnesium alloy in an atmosphere of water vapor were investigated using an environmental scanning electron microscope (ESEM). The in situ observations results indicated that both dust particle and AlMn phase stimulated the formation and spreading of micro-droplets, but had few influences on the spreading of water film; salt particle accelerated the formation and spreading of micro-droplets, and the spreading of water film. The generalized form for the spreading kinetics of micro-droplets and water film was D = At-n with D representing the diameter for micro-droplet and the spreading distance for water film, A the formation ability constant of micro-droplet, n the spreading exponent (0 < n < 0.5 for micro-droplet, n > 0.5 for water film). Micro-droplet preferentially formed at the position with a high A value, and the driving force of the spreading of micro-droplets and water film was concentration gradient. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1449 / 1459

页数：11

共 10 条

[1]

Observation of micro-droplets on metal surface in early atmospheric corrosion [J].