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<p>Metal wear and corrosion require a protective coating with good corrosion and wear resistance. The inorganic adhesive of methyltriethoxysilane modified silica sol (SMP) was first synthesized by the dehydration condensation of silica sol (S30) with methyltriethoxysilane in propyl alcohol. Then, SMP was used to modify the organic polyurethane (PU) by adjusting the volume ratio. The optimal ratio of the organic–inorganic hybrid adhesive PU-SMP was obtained by measuring its film-forming, mechanical, and corrosion-resistant properties. Then, PU-SMP and zirconia nanoparticles (ZrO<sub>2</sub>) were used as an adhesive and functional filler to prepare the organic–inorganic composite coating of PU-SMP@ZrO<sub>2</sub> via spraying on various substrates. The fabricated PU-SMP@ZrO<sub>2</sub> performed superior mechanical strength, good wear performance, and excellent anti-corrosion property. The pencil hardness of the coating PU-SMP@2.5ZrO<sub>2</sub> is 7H, the wear mass is reduced from 0.7 to 0.2&#xa0;mg, and the impedance modulus reached 10<sup>7</sup>&#xa0;Ω&#xa0;cm<sup>2</sup>. The synthesized organic–inorganic hybrid adhesive and its composite coatings provide a promising approach for constructing functional protective coatings on mechanical engineering material.</p>

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Organic–inorganic composite coatings of PU-SMP@ZrO2 with enhancing corrosion/wear resistances

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Zun-shuo Li,
  • Zhong-shan Wang,
  • Ming-ming Liu,
  • Yong-ling Wu,
  • Hong-yu Zheng

摘要

Metal wear and corrosion require a protective coating with good corrosion and wear resistance. The inorganic adhesive of methyltriethoxysilane modified silica sol (SMP) was first synthesized by the dehydration condensation of silica sol (S30) with methyltriethoxysilane in propyl alcohol. Then, SMP was used to modify the organic polyurethane (PU) by adjusting the volume ratio. The optimal ratio of the organic–inorganic hybrid adhesive PU-SMP was obtained by measuring its film-forming, mechanical, and corrosion-resistant properties. Then, PU-SMP and zirconia nanoparticles (ZrO2) were used as an adhesive and functional filler to prepare the organic–inorganic composite coating of PU-SMP@ZrO2 via spraying on various substrates. The fabricated PU-SMP@ZrO2 performed superior mechanical strength, good wear performance, and excellent anti-corrosion property. The pencil hardness of the coating PU-SMP@2.5ZrO2 is 7H, the wear mass is reduced from 0.7 to 0.2 mg, and the impedance modulus reached 107 Ω cm2. The synthesized organic–inorganic hybrid adhesive and its composite coatings provide a promising approach for constructing functional protective coatings on mechanical engineering material.