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Study on Wettability and Corrosion Behavior of Al2O3 Doped Polyurea Coatings

  • NANOSCALE AND NANOSTRUCTURED MATERIALS AND COATINGS
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Abstract

The Al2O3 powder was added as a filler to polyurea and the effect of doping amount on Shore hardness and wetting property were investigated. The electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion resistance of coating/aluminum alloy system in 0.1 mol/L NaOH solution. The results showed that with the increase of the doping amount, the Shore hardness of the coating increased and the contact angle on the aluminum alloy matrix decreased. By analyzing the results of the characteristics of EIS and the fitting results, doped Al2O3 powder can improve the coating corrosion resistance, but it may affect the density of the coating and reduce the impedance modulus during the initial stage of immersion. The relationship between the doping amount of Al2O3 powder and the corrosion resistance in this test was 5 wt % > 10 wt % > 15 wt % > 0 wt %. In general, in the doping range of this test, since the powder was uniformly distributed in the polyurea coating, the cohesive force of the polyurea can be lowered to cause an increase in the wetting property. At the same time, excessive dopped Al2O3 powder may deteriorate the compactness of the polyurea and the binding property of the polyurea itself may decrease, resulting in deterioration of corrosion resistance. However, the proper doping of Al2O3 powder in polyurea improves its overall performance.

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Funding

The project was supported by National Natural Science Foundation of China (nos. 51871164, 51671144) and Tianjin Science and Technology Project (no. 18YFZCGX00050).

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Authors and Affiliations

  1. Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, 300072, Tianjin, China

    Jiaao Yan, Zhiming Gao, Qingchao Tan, Xian Yang & Wenbin Hu

  2. Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, 300072, Tianjin, China

    Wenbin Hu

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  1. Jiaao Yan
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  2. Zhiming Gao
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  3. Qingchao Tan
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  4. Xian Yang
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Correspondence to Zhiming Gao.

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Jiaao Yan, Gao, Z., Tan, Q. et al. Study on Wettability and Corrosion Behavior of Al2O3 Doped Polyurea Coatings. Prot Met Phys Chem Surf 56, 965–972 (2020). https://doi.org/10.1134/S2070205120050275

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  • DOI: https://doi.org/10.1134/S2070205120050275

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