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

doi:10.11902/1005.4537.2016.027

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

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

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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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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

Received: 02 March 2016

Fund: Supported by National Natural Science Foundation of China (50971048) and National Science and Technology Foundation Platform Project

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	Herong ZHOU
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	Xinpei HONG
	Shupeng SONG

Cite this article:

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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.027 OR https://www.jcscp.org/EN/Y2017/V37/I3/273

Table 1 Chemical compositions of Al and two Al alloys(mass fraction / %)

Fig.1 Mass losses of anodized 1060, 2A12 and 7A04 alloys during exposure in Jiangjin atmospheric environment

Table 2 Fitting results of A and n in Eq.(1)

Fig.2 Corrosion images of anodized 1060 aluminium (a, b, c) 7A04 Al-based (d, e, f) and 2A12 Al-based (g, h, i) alloys after exposure in Jiangjin atmospheric environment for 1 month (a, d, g), 12 months (b, e, h) and 24 months (c, f, i)

Fig.3 SEM images of anodized 1060 (a, b), 2A12 (c, d) and 7A04 (e, f) alloys after exposed in Jiangjin atmospheric environment for 24 months

Fig.4 EDS line-scanning results from point 1 to point 2 in Fig.3f: (a) O, (b) Al, (c) Si and (d) S

Fig.5 SEM images of anodized 1060 (a, b), 2A12 (c, d) and 7A04 (e, f) alloys after exposure in Jiangjin atmospheric environment for 24 months and then removing corrosion products

Fig.6 EDS line-scanning results along the line a-b inFig.5f: (a) Al, (b) Cu, (c) Mg

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