Raman and IR spectroscopy study of corrosion products on the surface of the hot-dip galvanized steel with alkaline mud adhesion
Raman and IR spectroscopy study of corrosion products on the surface of the hot-dip galvanized steel with alkaline mud adhesion
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DOI：
10.1002/jrs.2178
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发表时间：
2009-06-01
影响因子：
2.5
通讯作者：
Huang, Yizhong
中科院分区：
文献类型：
--
作者：
Zhang, Hong;Li, Xiaogang;Huang, Yizhong
采用拉曼光谱和红外光谱研究了汽车用热镀锌钢板在不同Cl-含量的碱性泥浆中的腐蚀产物。结果表明，碱泥中Cl-含量对镀锌钢板的腐蚀行为有很大影响。Cl-离子是腐蚀初期在钢表面形成Zn 5Cl 2（OH）（8）中心点H2O层的主要原因。其余的Cl-离子随后渗透并中断腐蚀产物层，导致点蚀。随后，形成α-FeOOH的红色腐蚀产物（形状为针状结构），然后转化为Fe 3 O 4的黑色锈（具有细针状）。有趣的是发现点蚀深度与Cl-离子含量成反比。腐蚀速率随泥浆中Cl-含量的增加而减小。版权所有（C）2009约翰威利父子有限公司
The corrosion products formed on hot-dip galvanized steel sheets for the automobile application with adhesion of alkaline mud containing different Cl- ion contents are investigated by means of Raman and infrared (IR) spectroscopy. Results show that the Cl- ion content in alkaline mud has great influence on the corrosion behavior of the galvanized steel. The Cl- ions are responsible for the formation of the Zn5Cl2(OH)(8)center dot H2O layer on the surface of the steel at the early stage of corrosion. The rest of the Cl- ions then penetrate and interrupt corrosion product layer resulting in pitting corrosion. Subsequently, the red corrosion product of alpha-FeOOH (shaped as needle-like structure) is formed, which then transforms into black rust of Fe3O4 (having a shape of slim needle). It is interesting to find out that pitting depth is inversely proportional to the Cl- ion content. However, corrosion rate decreases with the increase of the Cl- ions in mud. Copyright (C) 2009 John Wiley & Sons, Ltd.