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A sandwich-like structure hybrid coating of cold galvanizing coating/polydopamine on hot-dip galvanized steel with enhanced adhesion and corrosion resistance

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Abstract

This study aims to enhance the adhesion strength and anti-corrosion performance of the cold galvanizing coating (CGC) applied on the hot-dip galvanized steel (HDG). Polydopamine (PDA) is deposited on the HDG surface with different time ranges and as an interlayer between CGC and HDG through covalent immobilization. The surface morphology and the covalent interaction between PDA/HDG are exhibited by scanning electron microscope (SEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The pull-off adhesion tests before and after neutral slat spry tests show an enhanced dry adhesion strength and less adhesion loss of the hybrid CGC/PDA coated HDG compared with the direct CGC coated HDG. In addition, open circuit potential (OCP) reveals that the corrosion protection performance of the hybrid CGC/PDA coated HDG increases by 200% (up to 201 d) and the corrosion density icorr attaining about 4.45×10−7 A/cm2. Electrochemical impedance spectroscopy (EIS) measurements and X-ray diffraction (XRD) analysis confirm that the precipitate of the stable chelation formed by PDA and Zn2+ between CGC and HDG substrate can also improve the corrosion protection performance. Such a strategy of strengthening adhesion and forming the chelate compound at the HDG surface promises a new route to corrosion protection of CGC on HDG.

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Authors and Affiliations

  1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    JiWen Li, NingJie Gao, WanYu Zhang, Kenneth Izuchukwu Nwokolo, Hao Wu, FuChun Liu & En-Hou Han

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    JiWen Li, NingJie Gao, WanYu Zhang, Kenneth Izuchukwu Nwokolo, Hao Wu, FuChun Liu & En-Hou Han

  3. Institute of Corrosion Science and Technology, Guangzhou, 510530, China

    FuChun Liu & En-Hou Han

  4. Jihua Laboratory, Foshan Guangdong Province, Foshan, 528000, China

    Long Xu

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  1. JiWen Li
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  2. NingJie Gao
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  4. Long Xu
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  5. Kenneth Izuchukwu Nwokolo
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  7. FuChun Liu
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Correspondence to FuChun Liu or En-Hou Han.

Additional information

This work was supported by the LingChuang Research Project of China National Nuclear Corporation (Grant No. E041F212Z1).

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Li, J., Gao, N., Zhang, W. et al. A sandwich-like structure hybrid coating of cold galvanizing coating/polydopamine on hot-dip galvanized steel with enhanced adhesion and corrosion resistance. Sci. China Technol. Sci. 66, 2381–2395 (2023). https://doi.org/10.1007/s11431-022-2326-1

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  • DOI: https://doi.org/10.1007/s11431-022-2326-1

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