Effect of Pickling Process on Corrosion Resistance of Double Cold-reduced Tinplate with Different Tin Coating Masses

doi:10.11902/1005.4537.2025.066

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 939-946 DOI: 10.11902/1005.4537.2025.066

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Effect of Pickling Process on Corrosion Resistance of Double Cold-reduced Tinplate with Different Tin Coating Masses

ZHOU Qianyong¹, LAI Yang², LI Qian²^,³(

)

1 Cold Rolling Mill, Baoshan Iron and Steel Co., Ltd., Shanghai 200941, China
2 School of Materials Science and Engineering & State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China
3 College of Materials Science and Engineering & National Engineering Research Center for Magnesium Alloys & National Key Laboratory of Advanced Casting Technologies, Chongqing University, Chongqing 400044, China

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ZHOU Qianyong, LAI Yang, LI Qian. Effect of Pickling Process on Corrosion Resistance of Double Cold-reduced Tinplate with Different Tin Coating Masses. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 939-946.

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Abstract

The pickling process is a crucial step in the production of tinplate, and alterations in process parameters can affect the corrosion behavior of tinplate, which varies with changes in the tin coating mass. Currently, there is a lack of systematic research on the coupled influence mechanism of the pickling process and tin coating mass on the corrosion behavior of tinplate. Herein, the influence of electrolytic pickling and chemical pickling on the corrosion resistance of tinplates with different tin coating mass was assessed by means of neutral salt spray (NSS) testing, electrochemical testing methods and scanning electron microscopy (SEM), in terms of the variation of corrosion resistance and microstructure of coatings with varying tin coating weights and pickling processes. The results indicate that as the tin coating mass increases, the negative impact of switching to a chemical pickling process on the properties of tinplate gradually diminishes, which may be ascribed to the improved coating microstructure and property with the increasing tin mass. Furthermore, in case of high tin coating mass, the tinplate being subjected to chemical pickling can provide corrosion resistance comparable with that being subjected to electrolytic pickling.

Key words: tinplate pickling corrosion resistance electrochemical performance

Received: 25 February 2025 32134.14.1005.4537.2025.066

ZTFLH:

TG174

Corresponding Authors: LI Qian, E-mail: cquliqian@cqu.edu.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.066 OR https://www.jcscp.org/EN/Y2025/V45/I4/939

Fig.1 Surface macro-morphologies of tinplate samples plated with 1.1 g/m² (a1-h1, a2-h2), 5.6 g/m² (a3-h3, a4-h4) and 11.2 g/m² (a5-h5, a6-h6) amounts of tin and post-treated by electrolytic pickling (a1-h1, a3-h3, a5-h5) or chemical pickling (a2-h2, a4-h4, a6-h6) after neutral salt spray test for 1 d (a), 2 d (b), 4 d (c), 7 d (d), 10 d (e), 20 d (f), 30 d (g) and 40 d (h)

Fig.2 Mass loss curves of tinplate samples plated with different amounts of tin and post-treated by electrolytic pickling or chemical pickling during neutral salt spray test for 40 d: (a) 1.1  g/m², (b) 5.6 g/m², (c) 11.2  g/m²

Fig.3 Potentiodynamic polarization curves of tinplate samples plated with different amounts of tin and post-treated by electrolytic pickling or chemical pickling during immersion in 3.5%NaCl solution

Table 1 Fitting electrochemical parameters of potentiodynamic polarization curves in Fig.3

Fig.4 Nyquist (a) and Bode (b) plots of tinplate samples plated with different amounts of tin and post-treated by electrolytic pickling or chemical pickling during immersion in 3.5%NaCl solution

Fig.5 Equivalent circuit models for EIS fitting: (a) R(Q(R(QR))), (b) R(QR)(QR)

Coating mass / g·m^-2	R_s / Ω·cm²	Q_m-Y₀ / Ω^-1·cm^-2·s $- n 1$	Q_m-n	R_m / Ω·cm²	Q_dl-Y₀ / Ω^-1·cm^-2·s $- n 1$	Q_dl-n	R_ct / Ω·cm²
EP-1.1	8.17	6.62 × 10^-6	0.77	4.21 × 10⁵	3.86 × 10^-6	0.86	3.13 × 10³
CP-1.1	10.55	1.03 × 10^-5	0.78	1.39 × 10⁵	6.45 × 10^-6	0.86	1.62 × 10³
EP-5.6	7.32	9.35 × 10^-6	0.90	4.98 × 10⁶	2.17 × 10^-5	0.79	9.94 × 10²
CP-5.6	8.63	7.28 × 10^-6	0.89	2.31 × 10⁶	2.85 × 10^-5	0.79	1.78 × 10²
EP-11.2	12.34	8.21 × 10^-6	0.88	4.63 × 10⁶	1.42 × 10^-5	0.76	3.19 × 10³
CP-11.2	6.76	8.62 × 10^-6	0.89	3.59 × 10⁶	2.66 × 10^-5	0.80	7.85 × 10²

Table 2 Fitting electrochemical parameters of EIS in Fig.4

Fig.6 SEM images and EDS element mappings of tinplate samples plated with 1.1 g/m² (a, b), 5.6 g/m² (c, d) and 11.2  g/m² (e, f) amounts of tin and post-treated by electrolytic pickling (a, c, e) or chemical pickling (b, d, f)

Table 3 EDS determined surface compositions of tinplate samples plated with different amounts of tin and post-treated by electrolytic pickling or chemical pickling (atomic fraction / %)

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