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Chinese Journal of Materials Research  2017, Vol. 31 Issue (5): 359-368    DOI: 10.11901/1005.3093.2016.488
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Effect of Cyclic Condensation and Sulfur Dioxide on Corrosion Behavior of 7A04 Aluminum Alloy
Herong ZHOU(), Wang YAO, Pengyang LIU, Jiayong DAN
School of Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
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Herong ZHOU, Wang YAO, Pengyang LIU, Jiayong DAN. Effect of Cyclic Condensation and Sulfur Dioxide on Corrosion Behavior of 7A04 Aluminum Alloy. Chinese Journal of Materials Research, 2017, 31(5): 359-368.

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Abstract  

The corrosion behavior of Al-alloy 7A04 under the condition of alternating condensation cycle with sulfur dioxide for 8 h and dry cycle for 16 h has been investigated by SEM, electrochemical impedance spectroscopy (EIS) and scanning kelvin probe (SKP). The results show that the corrosion of 7A04 alloy in the sulfur dioxide containing environmental condition of condensation cycle seems to be is an atmospheric the corrosion under thin liquid layer, like atmosphere corrosion. The corrosion products increase with time. Mass loss value gradually adds. The results of surface observation show that corrosion product is in the shape or in clusters. Corrosion product is made up of alumina and aluminum sulfate hydrate. The corrosion morphology shows mainly pitting corrosion and slight erosion. EIS simulation results exhibit that the corrosion rate of 7A04 alloy decreases sharply at the initial stage and gradually levels off at the later stage. Surface potential distribution maps reveal that the corrosion potential increase with corrosion time and become stable after 240 h, and the local active dissolution is related to the zonal distribution of the intermetallic compounds.
Key words:  materials failure and protection      cyclic condensation      sulfur dioxide corrosion      7A04 aluminum alloy      electrochemical impedance spectroscopy      scanning kelvin probe     
Received:  13 August 2016     
Fund: Supported by National Natural Science Foundation of China (No.50971048), National Science and technology foundation platform
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Herong ZHOU
Wang YAO
Pengyang LIU
Jiayong DAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.488     OR     https://www.cjmr.org/EN/Y2017/V31/I5/359

Si Fe Cu Mn Mg Zn Ti Al
0.063 0.41 1.56 0.24 2.72 5.81 0.015 89.182
Table 1  Chemical composition of 7A04 alloy (%, mass fraction)
Fig.1  Microstructure of 7A04 alloy (a) SEM image; (b) amplification of (a) image
Dot Si Fe Cu Mn Mg Zn O Cr Al
a 0.0 0.0 1.49 0.0 4.45 5.41 0.0 0.0 88.95
a1 4.53 19.87 3.05 4.92 0.0 1.22 0.0 1.93 64.49
a2 0.0 0.0 28.35 0.0 12.37 3.14 0.0 0.0 56.14
a3 22.64 0.0 0.0 0.0 11.46 2.90 12.79 0.0 49.21
Table 2  EDX analysis of intermetallic particles of 7A04 alloy (%, mass fraction)
Fig.2  Relationship between corrosion weight loss and time of 7A04 aluminum alloy
Fig.3  Surface corrosion morphology changes of 7A04 alloy (a) 24 h; (b) 48 h;(c) 96 h; (d) 240 h; (e) 360 h; (f) 480 h
Fig.4  SEM image changes of 7A04 alloy (a) 24 h; (b) 96 h;(c) 240 h; (d) 480 h
Fig.5  Image of 7A04 alloy after eliminating corrosion products (a) 24 h; (b) 96 h; (c) 240 h; (d) 480 h
Fig.6  AC impedance spectra of the 7A04 alloy (a) Nyquist; (b) bode
Fig.7  Equivalent circuits of 7A04 alloy, which Rs is the solution resistance, L the inductance, CPE the double layer capacitance and Rct the charge transfer resistance
Fig.8  Double layer parameters of 7A04 alloy in the solution (a) capacitance; (b) corrosion rate
Time 2 h 6 h 24 h 72 h 144 h 240 h 360 h
Rs /Ωcm2 56.8 47.44 53.96 124.7 153.1 142.7 78.74
CF /Ω-1cm-2S-n1 1.273×10-5 2.972×10-5 6.484×10-5 1.829×10-4 9.547×10-5 1.882×10-4 1.835×10-4
n1 0.96 0.89 0.94 0.922 0.90 0.7977 0.812
Rct /Ωcm2 3826 6349 6900 5030 5438 7841 9684
L /Ωcm2 6.135×10-5
Table 3  The change of EIS parameters of 7A04 alloy in the solution
Fig.9  SKP images of 7A04 alloy in solution (a) 0 h; (b) 24 h; (c) 96 h; (d) 168 h; (e) 240 h; (f) 360 h
Fig.10  Temperature and humidity changes during the process of cyclic condensation test
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