Initial Corrosion Behavior in Different Atmospheric Environments of 6061Al Alloy Anodized in Boron-sulfuric Acid Solution

doi:10.11901/1005.3093.2016.170

Chinese Journal of Materials Research

2017, Vol. 31

Issue (1): 49-56 DOI: 10.11901/1005.3093.2016.170

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Initial Corrosion Behavior in Different Atmospheric Environments of 6061Al Alloy Anodized in Boron-sulfuric Acid Solution

Shasha WANG¹,Lang YANG¹,Yunhua HUANG^1,²(

),Kui XIAO^1,²,Xiaogang LI^1,²

1 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2 Key Laboratory for Corrosion and Protection (MOE), Beijing 100083, China

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Shasha WANG,Lang YANG,Yunhua HUANG,Kui XIAO,Xiaogang LI. Initial Corrosion Behavior in Different Atmospheric Environments of 6061Al Alloy Anodized in Boron-sulfuric Acid Solution. Chinese Journal of Materials Research, 2017, 31(1): 49-56.

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Abstract

The initial corrosion behavior and mechanism of 6061 aluminum alloy anodized in a solution of mixed boron-sulfuric acidswere studiedthrough outdoor exposure tests in industry-marine and northernsemi-ruralatmospheric environments at Qingdao and Beijing respectively by means of weight-loss measurement, mechanical property testand morphology observation of surface andfracture surface. The results show that after exposed in the industry-marine and the northernsemi-ruralatmospheric environment for one year, the average corrosion rates of the anodized alloy decrease 43.3% and 10.1%, respectively in comparison to the naked alloy, thus the anodic treatment impedes the corrosion and this effect is much efficient in the severer environment. The break elongation of the naked alloy exposed in industry-marine environment for one year decreases 35% in comparison with the original one, but the decrease for the anodized alloy is 23%. Therefore, the anodization with boron-sulfuric acid is not enough to prevent the plasticity deterioration of the alloy; correspondingly, ductile fracture of the surface layer has changed to brittle cleavage. Nevertheless, the above results provide an important reference to the corrosion and protection of aviation materials.

Key words: materials failure and protection pitting corrosion anodizingin boron-sulfuric acid 6061 aluminum alloy atmospheric corrosion

Received: 31 March 2016

Fund: Supported by National Basic Research Program of China (No.2014CB643300), National Natural Science Foundation of China (No.51471033) and National Environmental Corrosion Platform

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	Shasha WANG
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	Yunhua HUANG
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	Xiaogang LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.170 OR https://www.cjmr.org/EN/Y2017/V31/I1/49

Table 1 Chemical composition of 6061 aluminum alloy (%, mass fraction)

Table 2 Experimental conditions in Qingdao and Beijing experiment stations (Year 2014)

Table 3 The average corrosion rates of various samples

Fig.1 Macro corrosion morphologies of various samples before removing the rusts. (a) initialalloy, nakedalloy exposed for six months in (b) Qingdao and (c) Beijing; naked alloy exposed for one year in (d) qingdao and (e) Beijing; anodized alloy exposed for one year in (f) Qingdao and (g) Beijing

Fig.2 Macro corrosion morphologies of various samples before removing the rusts. (a) initialalloy, nakedalloy exposed for six months in (b) Qingdao and (c) Beijing; naked alloy exposed for one yearin (d) ingdao and (e) Beijing; anodized alloy exposed for one year in (f), Qingdao and (g) Beijing

Fig.3 Cross sections and EDS analysis of the samples exposed in (a) Qingdao and (b) Beijing

Fig.4 SEM images of fractures (a,d,g),fracture edges (b,e,h) and centers(c,f,i). Naked alloy exposed for (a,b,c) six month,and (d,e,f) one year; (g,h,i) anodized alloy exposed for one year in Qingdao

Fig.5 SEM images of fractures (a,d,g),fracture edges (b,e,h) and centers (c,f,i). Naked alloy exposed for (a,b,c) six month,and (d,e,f) one year; (g,h,i) anodized alloy exposed for one year in Beijing

Table 4 Mechanical properties data of 6061 aluminum alloy samples

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