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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (4): 883-890    DOI: 10.11902/1005.4537.2023.296
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Fast Evaluation of Resistance to High Temperature Steam Sterilization Process for Organic Coating Coated Tinplate by Electrochemical Method
LIU Zhe1, DENG Chengman1, WEI Junsheng2, XIA Da-Hai1()
1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
2. Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China
Cite this article: 

LIU Zhe, DENG Chengman, WEI Junsheng, XIA Da-Hai. Fast Evaluation of Resistance to High Temperature Steam Sterilization Process for Organic Coating Coated Tinplate by Electrochemical Method. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 883-890.

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Abstract  

The resistance to high temperature steam sterilization process of tinplate coated with polyester, epoxy-phenolic and epoxy-amino coating respectively was studied by cathodic polarization and electrochemical impedance spectroscopy (EIS), and then the relevant mechanism was also discussed. The results showed that the cathodic polarization current can effectively distinguish the protective properties of coated tinplate for food packaging, and the higher the cathodic polarization current, the worse the protective properties of the coating. The corrosion resistance of epoxy phenolic coating is the best, followed by the epoxy amino paint, and that of polyester coating is the worst. After high temperature steam sterilization at 127oC for 1 h, the protection performance of the coated tinplate in 3.5%NaCl solution decreased, and the low-frequency impedance modulus decreased, namely the minimum value was 5.4% and the maximum was 69.7%. Overall, the resistance to high temperature steam sterilization of the three coatings was similar. The bonding strength between the coating/ tinplate and the wettability of the coating were the main parameters that affect its resistance to high temperature steam sterilization process. The better the bonding strength and the worse the wettability of the coating, the better the resistance to the high temperature steam sterilization process.
Key words:  tinplate      electrochemical impedance spectroscopy      cathodic polarization      fast evaluation     
Received:  18 September 2023      32134.14.1005.4537.2023.296
ZTFLH:  O646  
Fund: Baoshan Iron & Steel Co., Ltd
Corresponding Authors:  XIA Dahai, E-mail: dahaixia@tju.edu.cn
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LIU Zhe
DENG Chengman
WEI Junsheng
XIA Da-Hai

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.296     OR     https://www.jcscp.org/EN/Y2024/V44/I4/883

Steel grade

Sample No.

(without boiling sterilization)

Sample No.

(with boiling sterilization)

Coating type
TH435A1-0A1-1Polyester-BPA-NI paint
TH415B1-0B1-1
TH550C1-0C1-1
TH550D1-0D1-1
TH435A2-0A2-1Epoxy Phenolic Coating
TH415B2-0B2-1
TH550C2-0C2-1
TH550D2-0D2-1
TH435A3-0A3-1Epoxy amino paint
TH415B3-0B3-1
TH550C3-0C3-1
TH550D3-0D3-1
Table 1  Numbers of the lacquered tinplate samples with polymer coatings in the tests
Fig.1  Cathodic polarization curves of the samples with the numbers of series A (a), series B (b), series C (c) and series D (d) before and after boiling sterilization in 3.5%NaCl solution
Fig.2  Cathodic currents at -1.4 VSCE for the samples with various coatings before (a) and after (b) boiling sterilization
Fig.3  EIS results of the samples with the numbers of series A (a, b), series B (c, d), series C (e, f) and series D (g, h) before and after boiling sterilization in 3.5%NaCl solution
Sample No.OCP|Z|0.01 HzSample No.OCP|Z|0.01 HzReduction of |Z|0.01 Hz
VSCE105 Ω⸱cm2VSCE105 Ω⸱cm2
A1-0-0.4901.810A1-1-0.5031.33026.5%
A2-0-0.546199.0A2-1-0.525153.023.1%
A3-0-0.48478.00A3-1-0.52837.7051.7%
B1-0-0.4991.110B1-1-0.5180.87521.2%
B2-0-0.53880.20B2-1-0.65563.9020.3%
B3-0-0.52293.90B3-1-0.55252.1044.5%
C1-0-0.4822.740C1-1-0.4780.76172.2%
C2-0-0.554167.0C2-1-0.529158.05.4%
C3-0-0.53070.70C3-1-0.48768.103.7%
D1-0-0.5113.090D1-1-0.5370.93569.7%
D2-0-0.547397.0D2-1-0.534130.067.3%
D3-0-0.546149.0D3-1-0.56064.2056.9%
Table 2  Open circuit potentials and impedance moduli of various samples without and with boiling sterilization at 0.01 Hz
Fig.4  Surface morphologies of the samples with various coatings before and after boiling sterilization
Fig.5  Cross-sectional morphologies and EDS elemental profiles of A1 (a, d), A2 (b, e), A3 (c, f) samples without (a-c) and with (d-f) boiling sterilization
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