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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (2): 110-116    DOI: 10.11902/1005.4537.2016.090
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Effect of Corrosion Products on Long-term Atmospheric Corrosion of Pure Aluminum 8A06
Shuangqing SUN1,Qifei ZHENG2,Chunling LI1(),Xiumin WANG1,Songqing HU1
1 College of Science, China University of Petroleum (East China), Qingdao 266580, China
2 National Engineering and Technology Research Center for Nonferrous Metals Composites, Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China
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Abstract  

Atmospheric corrosion products of pure aluminum alloy 8A06 exposed for 20 a in coastal- and industrial-atmosphere respectively was investigated by electron probe microanalysis (EPMA), wavelength-dispersive X-ray spectroscopy (WDS) and electrochemical impedance spectroscopy (EIS). Results show that the corrosion rate of the specimen exposed in industrial atmosphere is approximately 1.5 times higher than that exposed in coastal atmosphere, though the corrosion products in both atmospheres all mainly contained elements O, Al and S. In 0.6 mol/L Na2SO4 solution, Rp could be arranged in a decreasing order as follows: withdrawn specimens exposed for 20 a in coastal atmosphere>withdrawn specimens exposed for 20 a in industrial atmosphere>bare substrate of pure aluminum 8A06. This indicates that the protectiveness of corrosion products on the specimens exposed in coastal environment is better than that exposed in industrial environment.
Key words:  aluminum      atmospheric corrosion      corrosion products      EPMA      WDS      EIS     
Received:  05 July 2016     
Fund: Supported by National Natural Science Foundation of China (51201183 and 51501226), Fundamental Research Funds for the Central Universities (14CX02221A and 17CX05023) and Applied Fundamental Research Foundation of Qingdao Independent Innovation Plan (16-5-1-90-jch and 15-9-1-46-jch)
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Shuangqing SUN
Qifei ZHENG
Chunling LI
Xiumin WANG
Songqing HU

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Shuangqing SUN,Qifei ZHENG,Chunling LI,Xiumin WANG,Songqing HU. Effect of Corrosion Products on Long-term Atmospheric Corrosion of Pure Aluminum 8A06. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 110-116.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.090     OR     https://www.jcscp.org/EN/Y2017/V37/I2/110

Test site Atmospheretype Geographic coordinate Average
temperature / ℃		 Average
RH / %		 Rain pH Deposition / mgm-2d-1
East longitude North latitude Cl- SO2
Wanning Coastal 110o30′ 18o58′ 24.4 86 5.0 46.75 4.24
Jiangjin Industrial 106o15′ 29o19′ 18.2 81 4.4 0.76 77.45
Table 1  Climatic parameters and atmospheric pollutants data at Wanning and Jiangjin test sites during the periodfrom 1990 to 2001
Fig.1  Corrosion rates of pure aluminium 8A06 as a function of exposure time at Wanning site (coastal atmosphere) and Jiangjin site (industrial atmosphere)
Fig.2  Macrographs (a, b) and micrographs (c~f) of Al 8A06 exposed for 20 a at Wanning site
Position O Al S Si Cl Ca Fe
Front face Spot 1 49.90 41.64 5.89 1.18 0.86 0.14 0.39
Spot 2 49.93 40.83 5.61 2.15 0.69 0.14 0.66
Average 49.92 41.24 5.75 1.67 0.78 0.14 0.53
Back face Spot 3 55.65 40.93 1.90 --- 1.52 --- ---
Spot 4 55.21 42.08 1.65 --- 1.06 --- ---
Average 55.43 41.51 1.78 --- 1.29 -! ---
Table 2  WDS spot analysis results of element compositions of corrosion products formed on both front and backfaces of Al 8A06 after exposure for 20 a at Jiangjin site (mass fraction / %)
Fig.3  Macrographs (a, b) and micrographs (c, d, e, f) of Al 8A06 exposed for 20 a at Jiangjin site
Fig.4  Enlarged views of the marked areas in shown in Fig.3f (a) and the magrified images of areas I (b) and II (c) in Fig.4a
Location O Al S Si P C K Ca Fe
Front Face Outside of pit Spot 1 50.91 33.85 6.42 5.77 0.57 --- 0.28 0.23 1.97
Spot 2 54.30 27.56 6.91 7.33 0.35 --- 0.40 0.65 2.50
Average 52.61 30.71 6.67 6.55 0.46 --- 0.34 0.44 2.24
Inside ofpit Spot 3 23.31 55.97 0.90 10.16 0.35 --- 0.89 0.21 8.19
Spot 4 18.22 53.83 0.71 6.28 0.33 17.98 0.33 0.27 2.06
Average 20.77 54.90 0.81 8.22 0.34 8.99 0.61 0.24 5.13
Back Face Outerlayer Spot 5 47.68 41.79 3.72 4.85 --- --- 0.19 0.17 1.61
Spot 6 48.70 41.90 4.53 3.43 --- --- 0.19 0.29 0.95
Average 48.19 41.85 4.13 4.14 --- --- 0.19 0.23 1.28
Inner layer Spot 7 27.86 61.79 1.59 5.47 --- --- 0.21 0.95 2.15
Spot 8 23.62 63.98 1.68 --- 0.30 10.42 --- --- ---
Average 25.74 62.89 1.64 2.74 0.15 5.21 0.11 0.48 1.08
Table 3  WDS analysis results of elemental compositions of corrosion products formed on both front and back facesof Al 8A06 exposed at Jiangjin test site for 20 a (mass fraction / %)
Fig.5  Bode plots of the front (a, c) and back (b, d) faces of Al 8A06 samples exposed for 20 a at Wanning site (a, b) and Jiangjin site (c, d) after immersion in 0.6 mol/L Na2SO4 solution (pH=5) for different time
Fig.6  Rp values of the front and back faces of Al 8A06 exposed for 20 a at Wanning and Jiangjin test sites after immersion in 0.6 mol/L Na2SO4 solution (pH=5) for different time
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