Effect of Plastic Deformation Processing on Corrosion Behavior of Pure Zinc in a Leaching Solution of Soil at Tianjin

doi:10.11902/1005.4537.2023.108

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 497-504 DOI: 10.11902/1005.4537.2023.108

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Effect of Plastic Deformation Processing on Corrosion Behavior of Pure Zinc in a Leaching Solution of Soil at Tianjin

LI Wenjie¹, CHE Xiaoyu¹, TANG Yongcun¹, LIU Guangming²(

), TIAN Wenming³, HE Hualin⁴, LIU Chenhui²

^1.State Grid Tianjin Electric Power Company, Tianjin 300010, China
^2.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^3.School of Materials Engineering, North China Institute of Aerospace Engineering, Langfang 065000, China
^4.Chengdu Great Norga Science and Technology Co., Ltd., Chengdu 611330, China

Cite this article:

LI Wenjie, CHE Xiaoyu, TANG Yongcun, LIU Guangming, TIAN Wenming, HE Hualin, LIU Chenhui. Effect of Plastic Deformation Processing on Corrosion Behavior of Pure Zinc in a Leaching Solution of Soil at Tianjin. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 497-504.

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Abstract

Pure zinc bars with different deformation degree were prepared by hot rolling. The effect of deformation degree on the microstructure and corrosion properties of pure zinc in a leaching solution of soil at Tianjin were studied by electrochemical test, immersion accelerating corrosion test and metallographic characterization. The results showed that the cast pure zinc had a coarse microstructure with a large number of fine sub-grains and casting twins. The primary grains of zinc were obviously refined, while the sub-grains were merged and grown with the increase of plastic deformation degree. The cast twins were significantly reduced as the deformation degree increased. The pitting potential and passivation interval of pure zinc in the soil leaching solution increased with the increase of deformation degree. While the corrosion current density and passivation current density decreased as the deformation degree increased. The resistance of passive film and the charge transfer resistance of corrosion process of zinc obviously increased after plastic deformation treatment. The continuously improved metallographic homogeneity of pure zinc, which resulted from the increased plastic deformation degree could enhance the corrosion resistance of pure zinc in the soil leaching solution.

Key words: pure zinc plastic processing metallographic structure electrochemistry soil corrosion

Received: 13 April 2023 32134.14.1005.4537.2023.108

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51961028)

Corresponding Authors: LIU Guangming, E-mail: gemliu@126.com

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	LI Wenjie
	CHE Xiaoyu
	TANG Yongcun
	LIU Guangming
	TIAN Wenming
	HE Hualin
	LIU Chenhui

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.108 OR https://www.jcscp.org/EN/Y2024/V44/I2/497

Fig.1 Low-magnification dark field metallographs (a, c, e, g) and high-magnification bright field metallographs (b, d, f, h) of 1# (a, b)， 2# (c, d), 3# (e, f) and 4# (g, h) pure zinc samples treated at different deformation degrees

Fig.2 Size distributions of the grains/sub-grains of 1# zinc wire (a), 2# cast zinc (b), 3# zinc rod (c) and 4# zinc rod (d) treated at different deformation degrees

Fig.3 OCP curves of 1#-4# pure zinc samples treated at different deformation degrees

Fig.4 Potential dynamic polarization curves of 1#-4# pure zinc samples treated at different deformation degrees

Table 1 Tafel fitting results of potentiodynamic polarization curves of 1#~4# pure zinc samples treated at different deformation degrees

Fig.5 Nyquist (a) and Bode (b) plots of 1#-4# pure zinc samples treated at different deformation degrees

Fig.6 Equivalent circuit used to fit EIS

Table2 Fitting values of R_hf and R_ct

Fig.7 Corrosion morphologies of 1# (a), 2# (b), 3# (c) and 4# (d) pure zinc samples after 30 d immersion in soil leaching solution

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