铝合金阳极氧化层在江津污染大气环境中暴露腐蚀行为研究

doi:10.11902/1005.4537.2016.027

中国腐蚀与防护学报

2017, Vol. 37

Issue (3): 273-278 DOI: 10.11902/1005.4537.2016.027

本期目录 | 过刊浏览

铝合金阳极氧化层在江津污染大气环境中暴露腐蚀行为研究

周和荣(

),胡碧华,姚望,洪新培,宋述鹏

武汉科技大学材料与冶金学院武汉 430081

Atmospheric Corrosion of Anodized Pure Al 1060, Al-alloys 2A12 and 7A04 Exposed to Polluted Atmospheric Environment at Jiangjin Region

Herong ZHOU(

),Bihua HU,Wang YAO,Xinpei HONG,Shupeng SONG

School of Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要:

采用扫描电镜、能谱和X射线衍射仪以及腐蚀失重等分析测试方法研究了1060纯Al、2A12和7A04铝合金表面阳极氧化膜层在江津工业大气环境中的暴晒腐蚀行为。结果表明,1060纯Al、2A12和7A04铝合金阳极氧化膜层失重与暴露时间的关系符合幂函数规律;随腐蚀时间的延长,腐蚀产物不断增多,失重增大。3种铝材腐蚀严重程度顺序由大到小依次为：2A12铝合金>7A04铝合金>1060纯Al。腐蚀产物呈团状和块状形貌,主要由Al₂O₃、Al(OH)₃和硫酸铝水合物组成。3种铝材除去表面腐蚀产物的阳极氧化膜层损伤和腐蚀坑数量差别明显,腐蚀机制为Al₂O₃在酸性介质中的溶解。

关键词 ：铝合金, 阳极氧化膜, 江津, 工业污染大气, 暴露实验

Abstract：

The atmospheric corrosion behavior of anodized pure Al 1060 as well as Al-alloys 2A12 and 7A04 exposed for 24 months in atmosphere with pollutants at Jiangjin region was investigated by mass loss method, scanning electron microscope (SEM), energy dispersive X-ray detector (EDS) and X-ray diffractometer (XRD). The results show that the relation of mass loss versus time (h) accords with power function law as C=At ⁿ. In other words, the corrosion product is increasing with testing time. The order of corrosion severity of the tested materials can be ranked as the following order 2A12 alloy>7A04 alloy>1060. The corrosion products show agglomerate structure composited of Al₂O₃,Al(OH)₃ and aluminum sulfate hydrate. After removing the surface corrosion products, clear difference in the damage manner and the quantity of corrosion pits can be observed for the three anodic oxidation films. The corrosion mechanism may be ascribed to the dissolution of alumina in certain acidic medium.

Key words： aluminum alloy anodizing film Jiangjin region industrial polluted atmosphere exposure test

收稿日期: 2016-03-02

基金资助:国家自然科学基金面上项目 (50971048) 和国家科技基础条件平台专项

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引用本文:

周和荣,胡碧华,姚望,洪新培,宋述鹏. 铝合金阳极氧化层在江津污染大气环境中暴露腐蚀行为研究[J]. 中国腐蚀与防护学报, 2017, 37(3): 273-278.
Herong ZHOU, Bihua HU, Wang YAO, Xinpei HONG, Shupeng SONG. Atmospheric Corrosion of Anodized Pure Al 1060, Al-alloys 2A12 and 7A04 Exposed to Polluted Atmospheric Environment at Jiangjin Region. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 273-278.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.027 或 https://www.jcscp.org/CN/Y2017/V37/I3/273

表1 纯Al及铝合金的化学成分

图1 经阳极氧化的1060纯Al、2A12和7A04铝合金在江津大气试验站失重与暴露时间的关系曲线

表2 式 (1) 中A和n的拟合数据

图2 阳极氧化预处理的1060纯Al,7A04铝合金和2A12铝合金在江津大气环境中暴晒不同时间后的宏观腐蚀形貌

图3 阳极氧化预处理的1060纯Al,2A12和7A04铝合金在江津大气环境中暴晒24个月后的表面微观形貌

图4 图3f中1-2位置处腐蚀产物的EDS分析

图5 阳极氧化预处理的1060纯Al、2A12和7A04铝合金在江津站暴晒24个月并除去腐蚀产物后的形貌

图6 图5f点蚀坑a-b位置EDS分析

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