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Journal of Chinese Society for Corrosion and protection  2023, Vol. 43 Issue (6): 1383-1391    DOI: 10.11902/1005.4537.2022.377
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Corrosion Resistance and Aging Mechanism of Polyurethane Topcoat for High-speed Train
LI Chunlin1, SHI Hongwei2,3(), LIANG Guoping3,4, LI Li1, WANG Hao1, WANG Wei4, LIU Fuchun3, HAN En-Hou3
1.CRRC Qingdao Sifang Co., Ltd., 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
Cite this article: 

LI Chunlin, SHI Hongwei, LIANG Guoping, LI Li, WANG Hao, WANG Wei, LIU Fuchun, HAN En-Hou. Corrosion Resistance and Aging Mechanism of Polyurethane Topcoat for High-speed Train. Journal of Chinese Society for Corrosion and protection, 2023, 43(6): 1383-1391.

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Abstract  

The corrosion resistance and aging mechanism of polyurethane topcoat on Al-alloy plates used for high-speed train were studied by electrochemical impedance spectroscopy (EIS), ultraviolet aging, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The results showed that the polyurethane topcoat presented post-curing phenomenon after immersing in 3.5wt.%NaCl solution for 240 h. The topcoat/Al-alloy interface was slightly corroded within the period of 384-1560 h, and the corrosion product film was formed on the surface of Al-alloy substrate within 1920-2160 h. During the ultraviolet (UV) aging test, holes gradually emerged on the surface of polyurethane topcoat, which then became loose and spalling, meanwhile its glossiness gradually decreased with increasing reduction of glossiness, as well as its color difference increased and then tended to be stable. It follows that the visible light degradation was the main degradation in the early stage of aging, and UV degradation was the main degradation in the late stage of aging.
Key words:  polyurethane topcoat      Al-alloy      electrochemical impedance spectra      ultraviolet aging      Fourier transform infrared spectroscopy     
Received:  01 December 2022      32134.14.1005.4537.2022.377
ZTFLH:  TG172  
Fund: National Natural Science Foundation of China(52171089)
Corresponding Authors:  SHI Hongwei, E-mail: hwshi@imr.ac.cn
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LI Chunlin
SHI Hongwei
LIANG Guoping
LI Li
WANG Hao
WANG Wei
LIU Fuchun
HAN En-Hou

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.377     OR     https://www.jcscp.org/EN/Y2023/V43/I6/1383

Fig.1  Bode (a) and Nyquist (b) plots of polyurethane topcoat/aluminum alloy system immersed in 3.5%NaCl solution for different time
Fig.2  Equivalent circuit models of EIS of polyurethane topcoat / aluminum alloy system after immersion in 3.5%NaCl solution for 0.5-240 h (a), 384-1560 h (b) and 1920-2160 h (c)
Fig.3  Bode (a, c, e) and Nyquist (b, d, f) plots of polyurethane topcoat/aluminum alloy system immersed in 3.5%NaCl solution for 0.5-240 h (a, b), 384-1560 h (c, d) and 1920-2160 h (e, f)
Immersion time / h

Rc

Ω·cm2

Cc

Rct

Ω·cm2

Cdl

Rsf

Ω·cm2

Csf
Y0/S·sa·cm2a0Y1/S·sa·cm2a1Y2/S·sa·cm2a2
0.51.32×10116.63×10-119.34×10-1//////
728.32×10115.40×10-119.53×10-1//////
2401.52×10124.97×10-119.60×10-1//////
3841.04×10124.98×10-119.59×10-13.63×1055.70×10-128.00×10-1///
6002.13×10104.66×10-119.67×10-14.46×1061.86×10-119.31×10-1///
12001.14×10104.27×10-119.74×10-11.05×1046.04×10-121.00×100///
15607.27×1094.74×10-119.65×10-11.15×10126.60×10-116.58×10-1///
19003.32×1074.41×10-119.71×10-16.15×1084.83×10-118.35×10-12.6×10101.00×10-97.14×10-1
21603.09×1074.25×10-119.75×10-15.02×1084.18×10-118.71×10-12.45×1091.27×10-96.93×10-1
Table 1  Fitting results of EIS of polyurethane topcoat/aluminum alloy system immersed in 3.5%NaCl solution for different time
Fig.4  Variation of Rc of polyurethane topcoat/aluminum alloy system during immersion in 3.5%NaCl solution with time
Fig.5  Micro-morphologies of polyurethane topcoat 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 (a) and gloss reduction (b) of polyure-thane topcoat after aging for different time
Fig.7  Color difference change of polyurethane topcoat with aging time
Vibration mode of functional groupsVibration frequency / cm-1
O-H stretching3100-3600
Asymmetric -CH2 stretching2932
Symmetric -CH2 stretching2860
C=O stretching1723, 1685
C-N stretching and N-H bending in amide group1522
Asymmetric -CH2 bending1461
Symmetric -CH2 bending1335
-CH3 bending1379
C-O stretching1243, 1133, 1073
C-O-C stretching1016
Table 2  FTIR peaks of main functional groups in polyurethane resin
Fig.8  FTIR of polyurethane topcoat after aging for different time
Fig.9  Variations of peak area reduction rates of main functional groups of polyurethane topcoat with aging time
Fig.10  Variation of peak area ratio of C=O to C-H of polyurethane topcoat with aging time
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