Stress Corrosion and Its Mechanism of Hot-dip Galvanized Coating on Q235 Steel Structure

doi:10.11902/1005.4537.2023.324

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (5): 1305-1315 DOI: 10.11902/1005.4537.2023.324

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Stress Corrosion and Its Mechanism of Hot-dip Galvanized Coating on Q235 Steel Structure

ZHAO Qian¹, ZHANG Jie¹, MAO Ruirui², MIAO Chunhui¹, BIAN Yafei², TENG Yue¹, TANG Wenming²(

)

1 Electric Power Research Institute, Anhui Electric Power Co., Ltd., State Grid, Hefei 230601, China
2 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

Cite this article:

ZHAO Qian, ZHANG Jie, MAO Ruirui, MIAO Chunhui, BIAN Yafei, TENG Yue, TANG Wenming. Stress Corrosion and Its Mechanism of Hot-dip Galvanized Coating on Q235 Steel Structure. Journal of Chinese Society for Corrosion and protection, 2024, 44(5): 1305-1315.

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Abstract

The corrosion behavior of hot-dip galvanized coating on the Q235 steel plates commonly-used in grid equipment by applied bending stress was studied via immersion test in 0.05 mol/L NaCl solution while applied bending stress with a home-made three-point bending stress loading device. The results showed that by the applied bending stress, the corrosion of the hot-dip galvanized coating on Q235 steel plate was a process of repeated formation and spallation of corrosion products, of which the former involves apparently the occurrence of corrosion pits, while the later does not. The corrosion products were mainly composed of ZnO, Zn(OH)₂ and Zn₅(OH)₈Cl₂·H₂O. As the applied stress increased, the E_corr was decreased, but the I_corr and the electrochemical impedance were increased for the hot-dip galvanized coating on Q235 steel plate. A corrosion model was established to illustrate the corrosion process and the relevant mechanism for the corrosion of the hot-dip galvanized coating/Q235 steel plate. That is, the corrosion of the hot-dip galvanized coating was speeded by the applied bending stress to form more corrosion product Zn₅(OH)₈Cl₂·H₂O, which induced the formation of cracks at the stress concentrated sites beneath the corrosion product, i.e., the corrosion pits in η-Zn layer. The cracks then penetrated through the η-Zn layer, and extended along the interface ζ-FeZn₁₃/η-Zn. As a result, electrochemical corrosion of the galvanized coating was accelerated.

Key words: Q235 steel structure hot-dip galvanized layer stress corrosion microstructure corrosion mechanism

Received: 16 October 2023 32134.14.1005.4537.2023.324

ZTFLH:

TG174.3

Fund: Science and Technology Research Project of Anhui Electric Power Co., Ltd., State Grid, China(B3120522001G)

Corresponding Authors: TANG Wenming, E-mail: wmtang69@126.com

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	ZHAO Qian
	ZHANG Jie
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	MIAO Chunhui
	BIAN Yafei
	TENG Yue
	TANG Wenming

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.324 OR https://www.jcscp.org/EN/Y2024/V44/I5/1305

Fig. 1 Cross-sectional morphology of galvanized Q235 steel plate (a) and schematic diagram of the stress corrosion sample (b)

Fig.2 Schematic diagram of three-point bending device used in the test

Fig.3 Stress-strain curve of the galvanized steel sample in the tensile test

Fig.4 Optical photos of galvanized steel samples immersed in 0.05 mol/L NaCl solution for 144 h under 0 MPa (a), 89 MPa (b) and 178 MPa (c)

Table 1 Masses and corrosion induced mass changes of galvanized steel samples before and after immersion under 0, 89 and 178 MPa

Fig.5 XRD patterns of galvanized steel samples after immersion under different stresses

Fig.6 Low-magnification (a) and high-magnification (b) SEM images of the galvanized steel sample immersed under stress free, and EDS results (c, d) of the points 1 and 2 marked in Fig.6a and b, respectively

Fig.7 Low-magnification (a) and high-magnification (b) SEM images of the galvanized steel sample immersed under 89 MPa, and EDS results (c, d) of the points 1 and 2 marked in Fig.7a and b, respectively

Fig.8 Low-magnification (a) and high-magnification (b) SEM images of the galvanized steel sample immersed under 178 MPa, and morphology of the pit in Fig.8a (c), and EDS result of the point 1 marked in Fig.8c (d)

Fig.9 Cross-sectional morphologies of the galvanized steel samples after immersion under 0 MPa (a, b), 89 MPa (c, d) and 178 MPa (e, f)

Fig.10 Tafel curves of the galvanized steel samples after immersion under different stresses

Table 2 Fitting electrochemical parameters of the polarization curves in Fig. 10

Fig.11 EIS spectra of the galvanized steel samples after immersion under different stresses

Fig.12 Equivalent circuit models of the galvanized steel samples after immersion under 0 and 178 MPa (a), and 89 MPa (b)

Fig.13 Stress corrosion model of the galvanized layer of Q235 steel: (a, b) formation of corrosion pit, (c) formation and propagation of stress corrosion crack in η-Zn layer, (d) propagation of the stress corrosion crack in ζ phase layer

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