Corrosion Behavior of Galvanized Steel in a Simulated Marine Atmospheric Environment

doi:10.11902/1005.4537.2022.151

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 578-586 DOI: 10.11902/1005.4537.2022.151

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Corrosion Behavior of Galvanized Steel in a Simulated Marine Atmospheric Environment

WANG Jin¹, NING Peidong¹, LIU Qianqian², CHEN Nana², ZHANG Xin³, XIAO Kui²(

)

^1.Research Institute, JISCO Hongxing Iron and Steel Co. Ltd., Jiayuguan 735100, China
^2.Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
^3.Testing Center of University of Science and Technology Beijing Co. Ltd., Beijing 100083, China

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Abstract

The corrosion behavior of hot-dip galvanized steel after various test cycles in simulate marine atmospheric environment was assessed by mass loss method, 3D confocal microscope, electrochemical impedance spectroscope (EIS), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD) and X-ray photoelectron spectroscope (XPS). The results show that the corrosion rate of the steel samples was higher at the beginning of the experiment, then decreased at 56 d, and increased again at 104 d, which might be related to the formation of corrosion products. After being tested for 56 d, the steel suffered form mainly uniform corrosion, the main corrosion products were hydroxyzinc chloride (Zn₅(OH)₈Cl₂·H₂O), zinc oxide (ZnO) and basic zinc carbonate (Zn₅(OH)₆(CO₃)₂). In the simulated marine atmospheric environment, the corrosion resistance of the hot-dip galvanized coating failed quickly. Whilst, the corrosion rate has been accelerating until the formation of a relatively complete corrosion product film on the existed damaged areas, hence, the corrosion product film has a certain inhibitory effect on the corrosion of the coating.

Key words: hot-dip galvanized steel marine atmospheric environment indoor acceleration test corrosion mechanism

Received: 14 May 2022 32134.14.1005.4537.2022.151

ZTFLH:

TG174

Fund: National Materials Corrosion and Protection Date Center

Corresponding Authors: XIAO Kui, E-mail: xiaokui@ustb.edu.cn

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	WANG Jin
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Cite this article:

WANG Jin, NING Peidong, LIU Qianqian, CHEN Nana, ZHANG Xin, XIAO Kui. Corrosion Behavior of Galvanized Steel in a Simulated Marine Atmospheric Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 578-586.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.151 OR https://www.jcscp.org/EN/Y2023/V43/I3/578

Table 1 Corrosion mass loss data of GI plate in simulated marine atmospheric environment

Fig.1 Corrosion dynamics correlation curves of GI plate in simulated marine atmospheric environment: (a) thickness loss and average corrosion rate curves, (b) instantaneous corrosion rate

Fig.2 XRD spectra of GI panels after different periods of accelerated corrosion test in simulated marine atmospheric environment

Fig.3 XPS spectra of GI panels after different cycles of accelerated corrosion test in simulated marine atmospheric environment: (a) Zn 2p3/2, (b) C 1s, (c) O 1s, (d) Cl 2p

Fig.4 Macroscopic corrosion morphologies of GI panels after 0 d (a), 24 d (b), 40 d (c), 56 d (d), 72 d (e), 88 d (f), 104 d (g) and 120 d (h) of accelerated corrosion test in simulated marine atmospheric environment

Fig.5 3D confocal morphologies of GI panels after derusting in 24 d (a), 56 d (b), 104 d (c) and 120 d (d) in simulated marine atmospheric environment

Fig.6 Corrosion morphologies of GI panels after 24 d (a1, a2), 56 d (b1, b2), 104 d (c1, c2) and 120 d (d1, d2) in simulated marine atmospheric environment

Table 2 EDS results of GI panels after different test periods of simulated marine atmospheric environment

Fig.7 Micro-morphologies and element surface distribution of the GI coating section after 24 d (a), 56 d (b), 104 d (c) and 120 d (d) in simulated marine atmospheric environment

Fig.8 Electrochemical impedance spectra of GI plates in acidic (1±0.1) g/L NaHSO₃ solution after different test cycles: (a) Nyquist diagram, (b) Bode mode diagram, (c) Bode phase diagram

Fig.9 Equivalent circuits of GI plate in acidic (50±5) g/L NaCl solution: (a) 24, 56 and 104 d, (b) 120 d

Table 3 Equivalent circuit element fitting values of GI plate in acidic (50±5) g/L NaCl solution

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