Corrosion Behavior of Pure Zinc in Simulated Underground Seawater Infiltrated Saline-alkali Soils

doi:10.11902/1005.4537.2025.250

Journal of Chinese Society for Corrosion and protection

2026, Vol. 46

Issue (3): 864-874 DOI: 10.11902/1005.4537.2025.250

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Corrosion Behavior of Pure Zinc in Simulated Underground Seawater Infiltrated Saline-alkali Soils

LIU Chenhui¹, LIU Guangming¹(

), ZHU Yanbin¹, LU Yiliang², ZHANG Lingling¹, HUANG Zebang¹

^1.Jiangxi Provincial Key Laboratory of Lightweight Composite Materials, School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.China Electric Power Research Institute, Beijing 100192, China

Cite this article:

LIU Chenhui, LIU Guangming, ZHU Yanbin, LU Yiliang, ZHANG Lingling, HUANG Zebang. Corrosion Behavior of Pure Zinc in Simulated Underground Seawater Infiltrated Saline-alkali Soils. Journal of Chinese Society for Corrosion and protection, 2026, 46(3): 864-874.

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Abstract

In the article, the corrosion behavior of Zn-plate in saline-alkali soils with different underground seawater contents was assessed via a laboratory simulation where Zn-plates were buried in the designed soils. Then the morphology and phase composition of the corrosion products were characterized by means of SEM + EDS and XRD. Meanwhile the correlation between the acquired corrosion data of Zn in soils with 3.5%NaCl solution and with natural seawater soil was explored by using gray correlation and correlation analysis. The results indicate that when the salt-alkali soil contains various aqueous solutions such as deionized water, 3.5%NaCl solution, and natural seawater respectively while their contents all being less than 20%, the corrosion rate of Zn in the saline-alkali soils increases as the contents of each solution in the soil increase; when their contents are exactly 20%, the corrosion rate of Zn reaches its peak: i.e. 0.121, 1.094 and 1.152 g·cm^-2·a^-1, respectively; when the contents of all the three solutions are higher than 20%, the corrosion rate of Zn decreases as the content of each solution increases. When in soils with contents of 3.5%NaCl solution and natural seawater content ranging respectively from 10% to 50% the generated corrosion products on Zn surface are mainly ZnO, Zn(OH)₂, and Zn₅(OH)₈Cl₂·H₂O, which are loose with poor protectiveness. Besides, in soils with natural seawater, there was also a small amount of ZnS in the corrosion products. In soils contents both NaCl solution and natural seawater, the corrosion morphology of Zn transitions from localized corrosion to general corrosion with the increasing content of the two waters. The corrosion data for Zn in the above two types of soil exhibit high gray correlation coefficients (γ = 0.683-0.869) and strong correlations (R² = 0.989). Therefore, using 3.5%NaCl solution instead of seawater for the infiltration of saline-alkali soil may be a very effective method to simulate and predict the soil induced corrosion behavior of metals in coastal areas.

Key words: pure zinc saline-alkali soil soil corrosion underground seawater grey correlation correlation

Received: 05 August 2025 32134.14.1005.4537.2025.250

ZTFLH:

TG172.4

Fund: National Natural Science Foundation of China(51961028)

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

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	LIU Chenhui
	LIU Guangming
	ZHU Yanbin
	LU Yiliang
	ZHANG Lingling
	HUANG Zebang

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.250 OR https://www.jcscp.org/EN/Y2026/V46/I3/864

Fig.1 Schematic diagram of a cross - sectional sample

Fig.2 Corrosion rate of Zn test pieces buried in soil containing different amounts of deionized water, L solution, and H solution for 20 d

Fig.3 Mass-loss kinetic curve of Zn test pieces buried in soil containing different amounts of L solution (a) and H solution (b) for 20 d

Fig.4 XRD patterns of corrosion products from Zn test pieces buried in soil containing different amounts of L solution and H solution for 20 d: (a) soil environments with different contents of L solution, (b) soil environments with different contents of H solution

Fig.5 Macroscopic surface morphologies of Zn test pieces buried in soil containing 10% (a, h), 15% (b, i), 20% (c, j), 25% (d, k), 30% (e, l), 40% (f, m) and 50% (g, n) of solution L (a-g) and solution H (h-n) for 20 d

Fig.6 Microscopic surface morphologies and EDS energy spectrum of 1 (h), 2 (p) area of Zn test pieces buried in soil containing 10% (a, i), 15% (b, j), 20% (c, k), 25% (d, l), 30% (e, m), 40% (f, n) and 50% (h,o) of solution L (a-h) and solution H (i-p) for 20 d

Fig.7 Cross-sectional morphologies (a, d) and distribution (b, c, e, f) and EDS energy spectrum (g, h) of a Zn test piece buried in soil for 20 d when the contents of both solution L (a-c, g) and solution H (d-f, h) in the soil are 20%

Table 1 Calculation results of weight loss kinetics gray correlation degree of Zn in soils with different L solution contents and H solution contents

Fig.8 Comparison chart of the corrosion rate correlation of Zn after 20 d of corrosion in soils with different contents of L solution and different contents of H solution

Fig.9 Corrosion mechanism models of Zn in soils with different contents of L solution and different contents of H: (a) content of the solution is relatively low, (b) critical solution content, (c) saturated solution content

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