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Journal of Chinese Society for Corrosion and protection  2023, Vol. 43 Issue (1): 143-151    DOI: 10.11902/1005.4537.2022.277
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Corrosion and Aging Behavior of 2A97 Al-Li Alloy with Typical Protective Coatings in Tropical Marine Atmosphere Environment
JIA Jinghuan1, LIU Ming1(), LUO Chen1, SUN Zhihua1, ZHAO Mingliang1, LI Xiaogang2
1 AECC Key Laboratory of Advanced Corrosion and Protection of Aeronautical Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
2 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
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Abstract  

Two typical protective coatings applied on 2A97 Al-Li alloy were exposed in Wanning natural environment test station in Hainan island, and their corrosion and aging behavior were studied by means of surface and cross section morphology observation, infrared spectroscopy, electrochemical impedance spectroscopy and other methods. The 2A97 Al-Li alloy was firstly subjected to anodic oxidation treatment, then applying either two layer coating of primer+topcoat (coating 1) or mono layered coating of only primer (coating 2). The results show that after 2.5 a exposure, the coating 1 keeps intact i.e. the coating and anodized layer are relatively complete, and the alloy matrix is not corroded. In the contrast, a large number of micro cracks emerge in coating 2 after 1 a exposure, and even spallation can be observed in some local areas of the coating, meanwhile, the anodic oxidation layer becomes thinner and the alloy matrix suffers from corrosion with the extension of exposure time. Compared with the coating 2, the coating 1 has better aging resistance, showing lower rate of light loss and chromatic aberration. The impedance spectrum of coating 1 consists of a capacitive reactance arc after different periods of exposure, which means that the corrosion process of coating 1 is mainly controlled by the inward diffusion of water and oxygen. While the electrolyte invades the interface between coating 2 and the matrix after 1 a exposure, and the coating begins to peel off with the extension of exposure time, which is mainly manifested as the corrosion of Al-Li alloy matrix, and the corrosion rate is controlled by the electrochemical process.
Key words:  2A97 Al-Li alloy      protective coating      tropical Marine atmosphere      corrosion      aging     
Received:  08 September 2022      32134.14.1005.4537.2022.277
ZTFLH:  TG172  
Fund: National Defense Science, Technology, Industry and Technology Foundation "13th Five-Year" Scientific Research Project(KH61180524)
Corresponding Authors:  LIU Ming, E-mail: luminousa@126.com
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JIA Jinghuan
LIU Ming
LUO Chen
SUN Zhihua
ZHAO Mingliang
LI Xiaogang

Cite this article: 

JIA Jinghuan, LIU Ming, LUO Chen, SUN Zhihua, ZHAO Mingliang, LI Xiaogang. Corrosion and Aging Behavior of 2A97 Al-Li Alloy with Typical Protective Coatings in Tropical Marine Atmosphere Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 143-151.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.277     OR     https://www.jcscp.org/EN/Y2023/V43/I1/143

Fig.1  Macroscopic morphologies of coating 1 (a-e) and coating 2 (f-j) sample after 0 a (a, f), 0.5 a (b, g), 1 a (c, h), 2 a (d, i), 2.5 a (e, j) of exposure at Wanning natural environment test station
Fig.2  Microstructures of coating 1 (a-d) and coating 2 (e-h) sample after 0.5 a (a, e), 1 a (b, f), 2 a (c, g) and 2.5 a (d, h) of exposure at Wanning natural environment test station
Fig.3  Cross-section morphologies of coating 1 sample after 0.5 a (a), 1 a (b), 2 a (c), 2.5 a (d) of exposure at Wanning natural environment test station
Fig.4  Cross-section morphologies of coating 2 sample after 0.5 a (a), 1 a (b), 2 a (c), 2.5 a (d) of exposure at Wanning natural environment test station
Fig.5  Variation of color difference and light loss rate of coating 1 and coating 2 in Wanning natural environment test station after different periods of exposure: (a) color difference, (b) light loss rate
Coating Period / a ΔL Δa Δb Chromatic
aberration
Coating 1 0.5 -7.56 4.84 -8.56 12.44
1 -5.48 5.13 -9.18 11.86
2 -6.35 5.09 -7.96 11.39
2.5 -6.23 5.15 -8.51 11.74
Coating 2 0.5 4.45 5.33 16.79 18.18
1 5.3 5.43 16.63 18.3
2 21.61 13.05 25.47 35.88
2.5 22.21 12.22 26.28 36.53
Table 1  Color data of coating 1 and coating 2 exposed at Wanning natural environment test station
Fig.6  Infrared spectrum analysis of coating 1 (a) and coating 2 (b) at Wanning Natural Environment Test station after different periods of exposure
Fig.7  Electrochemical impedance spectra of coating 1 and coating 2 at Wanning Natural Environment Test Station after different periods of exposure: (a) Nyquist diagram of coating 1, (b) Bode diagram of coating 1, (c) Nyquist diagram of coating 2, (d) Bode diagram of coating 2
Period / a Rs / Ω·cm2 Qc / Ω-1·cm-2s-n nc Rc / Ω·cm2
0.5 16090 1.94×10-9 0.9408 1.03×1011
1 3146 2.12×10-9 0.9646 2.84×1011
2 1541 2.86×10-9 0.9512 1.27×1010
2.5 2033 3.38×10-9 0.9539 1.44×109
Table 2  EIS fitting results of coating 1
Fig.8  Fitting circuit of EIS at different corrosion stages: (a) coating is complete, (b) electrolyte reaches the interface between the coating and the matrix, (c) corrosion products are generated at the interface between the coating and the matrix, (d) coating flakes off
Period / a Rs / Ω·cm2 Qc (Qp) / Ω-1·cm-2s-n nc (np) Rc (Rp) / Ω·cm2 Qdl / Ω-1·cm-2s-n ndl Rct / Ω·cm2 W / Ω·cm2
0.5 6213 1.31×10-7 0.6599 8.41×107 --- --- --- ---
1 6746 5.12×10-8 0.8067 2.05×107 3.82×10-8 0.7126 2.44×108 ---
2 1000 3.70×10-7 0.684 1.05×104 2.53×10-5 0.7708 7.81×105 6.22×106
2.5 10 6.79×10-8 0.819 1.14×104 2.20×10-5 0.4982 1.92×106 ---
Table 3  EIS fitting results of coating 2
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