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Journal of Chinese Society for Corrosion and protection  2025, Vol. 45 Issue (3): 757-764    DOI: 10.11902/1005.4537.2024.097
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Corrosion Behavior and Hydrothermal Aging Mechanism of Epoxy Primer on Al-alloy for High-speed Train
LI Li1, LI Shanwen1, SHI Hongwei2,3(), LIANG Guoping3,4, LI Chunlin1, SUN Yu1, QIN Jin2, WANG Wei4, HAN En-Hou3,5
1.Qingdao Sifang Co., Ltd., CRRC, Qingdao 266111, China
2.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
3.Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
4.Key Laboratory for Anisotropy and Texture of Materials Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
5.Institute of Corrosion Science and Technology, Guangzhou 510530, China
Cite this article: 

LI Li, LI Shanwen, SHI Hongwei, LIANG Guoping, LI Chunlin, SUN Yu, QIN Jin, WANG Wei, HAN En-Hou. Corrosion Behavior and Hydrothermal Aging Mechanism of Epoxy Primer on Al-alloy for High-speed Train. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 757-764.

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Abstract  

A home-made commercial two-component epoxy primer with a ratio of epoxy paint to curing agent 5:1 was applied on a high-strength Al-alloy plate used for high-speed train. Then the corrosion process of the epoxy primer/Al-alloy was studied in 3.5%NaCl solution by electrochemical impedance spectra. The accelerated aging test was carried out via a chamber with humidity of 95% at 60 ℃ for 60 d, after hydrothermal aging for different times, the change in surface morphology, gloss and color difference of the coating was assessed and the change of chemical bonds of epoxy primer was analyzed. The results show that when the coating was immersed in 3.5%NaCl until 2160 h, the impedance spectra changed a little, indicating a good barrier effect. After 2160 h, the protective ability of epoxy primer started to decline. After 60 d of hydrothermal aging, the surface of epoxy primer became rough due to the decomposition of epoxy resin and falling of the pigments and fillers. Fourier Transform Infrared Spectra of the epoxy primer show that the peak of C-O-C stretching vibration intensified in the first 10 d due to the post curing and then weakened due to the hydrolysis.
Key words:  epoxy primer      high-strength Al-alloy      electrochemical impedance spectra      hydrothermal aging      Fourier transform infrared spectra     
Received:  26 March 2024      32134.14.1005.4537.2024.097
ZTFLH:  TG172  
Fund: National Key R&D Program of China(2022YFB4700504)
Corresponding Authors:  SHI Hongwei, E-mail: hwshi@sut.edu.cn
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LI Li
LI Shanwen
SHI Hongwei
LIANG Guoping
LI Chunlin
SUN Yu
QIN Jin
WANG Wei
HAN En-Hou

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.097     OR     https://www.jcscp.org/EN/Y2025/V45/I3/757

Fig.1  Bode plots of Al-alloy samples painted with epoxy primer after immersion in 3.5%NaCl solution for different time
Fig.2  Equivalent circuit models of EIS of Al-alloy samples with epoxy primer after immersion for 0.5-3840 h (a) and 4200 h (b)
Fig.3  Bode plots and fitting curves of epoxy primer painted Al-alloy samples immersed in 3.5%NaCl solution for 0.5-120 h (a), 384-2160 h (b) and 2880-4200 h (c)
Immersion time / hRc / Ω·cm2QcWc / S·s1/2·cm-2
Y0 / S·sa·cm2a0
0.56.63 × 1086.10 × 10-108.64 × 10-1-
241.45 × 1095.99 × 10-108.65 × 10-1-
481.05 × 10103.97 × 10-108.93 × 10-1-
1201.25 × 10104.37 × 10-108.90 × 10-1-
3841.12 × 10104.50 × 10-108.92 × 10-1-
7201.09 × 10104.49 × 10-108.93 × 10-1-
12001.70 × 10104.14 × 10-109.00 × 10-1-
16801.32 × 10104.20 × 10-108.99 × 10-1-
21601.65 × 10104.19 × 10-109.00 × 10-1-
28802.23 × 1094.12 × 10-109.04 × 10-1-
38401.81 × 1095.11 × 10-108.87 × 10-1-
42009.79 × 1084.63 × 10-108.98 × 10-14.52 × 10-9
Table 1  Fitting results of EIS of epoxy primer coated Al-alloy immersed in 3.5%NaCl solution for different time
Fig.4  Rc values of epoxy primer coated Al-alloy immersed in 3.5%NaCl solution for different time
Fig.5  Micro-morphologies of epoxy primer after aging for 0 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 50 d (f), and 60 d (g)
Fig.6  Gloss values (a) and gloss reductions (b) of unsaturated epoxy primer after aging for different times
Fig.7  Color differences of epoxy primer after aging for different time
Vibration mode of functional groupsVibration frequency / cm-1
O-H stretching N-H stretching3296
Asymmetric -CH2 stretching2923
Symmetric -CH2 stretching2852
C=O stretching1720
C=O stretching in amide1642
C=C stretching in benzene ring1606、1507、1181
C=C stretching1582
-CH3 bending1456
C-N stretching1296
Asymmetric C-O-φ stretching1237 (φ represents benzene ring)
Symmetric C-O-φ stretching1034
C-O-C stretching1011
Para-substituted of benzene ring stretching in bisphenol A structure879、826
Table 2  FTIR peaks of main functional groups in epoxy resin
Fig.8  FTIR of epoxy primer after hydrothermal aging for different time
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