Characterization of Corrosion Products on Pure Al Exposed in Atmospheres at Typical Rural, Industrial and Coastal Areas in China

doi:10.11902/1005.4537.2015.018

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (1): 47-51 DOI: 10.11902/1005.4537.2015.018

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Characterization of Corrosion Products on Pure Al Exposed in Atmospheres at Typical Rural, Industrial and Coastal Areas in China

Yanjie LIU,Zhenyao WANG(

),Wei KE

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Pure Al plates were exposed in different atmospheres for 12 months at three typical test sites respectively: i.e. a rural site at Xishuangbanna of Yunnan province, an industrial site at Jiangjin of Sichuan province and a coastal site at Wanning of Hainan province. Then the corroded Al plates were characterized by means of EIS technique and SEM. The results indicate that the corrosion resistance of pure Al is the worst in the coastal atmosphere, the best in the rural atmosphere and the middle in the industrial atmosphere. Different thick layers of corrosion products were formed on Al surface in the rural and industrial atmosphere. In the contrast, a few corrosion products were formed dispersedly in the coastal atmosphere. The rate controlling step may be the diffusion of corrosive ions for the corrosion process in the coastal atmosphere, while the charge transfer for those in the rural and industrial atmospheres.

Key words: atmospheric corrosion Al EIS corrosion product

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Yanjie LIU,Zhenyao WANG,Wei KE. Characterization of Corrosion Products on Pure Al Exposed in Atmospheres at Typical Rural, Industrial and Coastal Areas in China. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 47-51.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.018 OR https://www.jcscp.org/EN/Y2016/V36/I1/47

Table 1 Main environmental parameters of the exposure sites

Fig.1 SEM surface morphologies of the corrosion products formed on Al in rural (a), industrial (b) and coastal (c) atmospheres for 12 months

Fig.2 SEM cross-section morphologies of the corrosion products formed on Al in rural (a), industrial (b) and coastal (c) atmospheres for 12 months

Fig.3 Pits morphologies of Al exposed in rural (a), industrial (b) and coastal (c) atmospheres for 12 months

Table 2 Values of R_ct, R_r1 and R_r2 of Al exposed in different atmospheres

Fig.4 Bode plots of Al exposed in the rural, industrial and coastal atmospheres for 12 months: (a) phase of Z vs frequency, (b) Z vs frequency

Fig.5 Equivalent circuits for Al samples un-exposed (a), exposed in the rural atmosphere for 12 months (b) and exposed in the industrial and coastal atmospheres for 12 months (c)

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