LC4铝合金在格尔木盐湖大气环境中的腐蚀行为-中国有色金属学报.PDF

第 17 卷第 1 期 中国有色金属学报 2007 年 1 月 Vol.17 No.1 The Chinese Journal of Nonferrous Metals Jan. 2007 文章编号：1004-0609(2007)01-0024-06 LC4 铝合金在格尔木盐湖大气环境中的腐蚀行为 王振尧，李巧霞，汪 川，韩 薇，于国才 ( 中国科学院金属研究所 材料环境腐蚀研究中心，沈阳 110016) 摘 要：通过在我国西北格尔木典型大气环境进行大气暴露实验，测定 LC4 铝合金在该地区的腐蚀率；利用扫描 电镜(SEM)、能量色散X 射线谱(EDX)、电子探针(EPMA)、 红外光谱(FTIR)和 X 射线衍射仪(XRD)观察分析 LC4 铝合金腐蚀表面形貌、元素分布和腐蚀产物结构。结果表明：LC4 铝合金的腐蚀以点蚀为主要特征，比其在非盐 湖大气环境中的腐蚀严重，朝地面的腐蚀比朝天面严重，腐蚀产物层中含有大量的氧和铝，较多的氯和硫；主要 腐蚀产物为 Al O ，Al O ·2SiO ·2H O 和 Al Cl ·6H O ；含氯和硫的盐参与铝合金的大气腐蚀过程，并起到促进腐 2 3 2 3 2 2 2 6 2 蚀的作用。 关键词：铝合金；大气腐蚀；盐湖；表面分析 中图分类号：TG 172.3 文献标识码：A Corrosion behaviors of Al alloy LC4 in Geermu salt lake atmosphere WANG Zhen-yao, LI Qiao-xia, WANG Chuan, HAN Wei, YU Guo-cai (Environmental Corrosion Centre, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China) Abstract: The corrosion behaviors of typical high-strength aluminum alloy LC4 was studied by atmospheric exposure test, combining the experimental techniques including mass loss, morphological check of samples and analysis of corrosion products. The products formed on aluminum alloy LC4 exposed for 12 months were characterized by X-ray diffractometry(XRD) and infrared transmission spectroscopy (IRS), the results show that the main products are Al O , 2 3 Al O ·2SiO ·2H O and Al Cl ·6H O. The surface morphology was observed by scanning electron microscopy (SEM). 2 3 2 2 2 6 2 The morphology of cross section of skyward surface exposed