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<p>In the paper, the high temperature protective coatings with the graphene-encapsulated nano-sized alumina composites (GO@N<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub> coating) and the coatings with the graphene-encapsulated micro-sized alumina composites (GO@M<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub>) coating are prepared by pretreating the aluminum oxide powder using hydrolyzed silane coupling agent by the same method. The protective performance of the coatings was analyzed by isothermal holding at 850°C. The effects of different coatings on high temperature oxidation kinetics of metal matrix and the protective mechanism of the coatings are analyzed through the analysis of the weight variation of samples, the morphology of the surface of coatings using SEM, the structure of the coatings using XPS. The results reveal that after isothermal holding for 10 hours at 850°C, the curves of the weight gain versus holding time for both the samples coated with GO@M<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub> coating and the samples coated GO@N<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub> coating follow the law of mixed parabola. Owing to chemical bonding grafting, the samples coated with GO@N<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub> coatings exhibit the lower oxidation rate constant, higher activation energy of oxidation reaction, and the better protective performance than the samples coated with GO@M<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub> coatings. GO@N<sub>m</sub>-Al<sub>2</sub>O<sub>3</sub> coatings are promising candidates for industrial steel protection during hot rolling and other high-temperature processes.</p>

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Study on the High Temperature Protective Mechanism of Coatings Modified with Graphene-encapsulated Nano-sized Alumina Composites

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • X. Z. Zhang,
  • P. Qiao,
  • Y. J. Li,
  • D. W. Wu

摘要

In the paper, the high temperature protective coatings with the graphene-encapsulated nano-sized alumina composites (GO@Nm-Al2O3 coating) and the coatings with the graphene-encapsulated micro-sized alumina composites (GO@Mm-Al2O3) coating are prepared by pretreating the aluminum oxide powder using hydrolyzed silane coupling agent by the same method. The protective performance of the coatings was analyzed by isothermal holding at 850°C. The effects of different coatings on high temperature oxidation kinetics of metal matrix and the protective mechanism of the coatings are analyzed through the analysis of the weight variation of samples, the morphology of the surface of coatings using SEM, the structure of the coatings using XPS. The results reveal that after isothermal holding for 10 hours at 850°C, the curves of the weight gain versus holding time for both the samples coated with GO@Mm-Al2O3 coating and the samples coated GO@Nm-Al2O3 coating follow the law of mixed parabola. Owing to chemical bonding grafting, the samples coated with GO@Nm-Al2O3 coatings exhibit the lower oxidation rate constant, higher activation energy of oxidation reaction, and the better protective performance than the samples coated with GO@Mm-Al2O3 coatings. GO@Nm-Al2O3 coatings are promising candidates for industrial steel protection during hot rolling and other high-temperature processes.