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<p>The aim of this work was to produce a high-temperature-resistant intumescent geopolymer-based coating on steel plates. The coatings were prepared with several expandable additives and heat-treated in a furnace at 800&#xa0;°C for 30&#xa0;min. Scanning electron microscopy (SEM) observations were carried out in situ during heat treatment. Furthermore, thermal analysis and X-ray diffraction measurements were performed on the heat-treated samples. The results revealed that producing geopolymer-based coatings with expansion rates of 400% associated with aluminum molar percentages less than or equal to 23.7% and the impact of reactive additives (MK + EA/MK) above 1.20 for viscosity values below 0.65&#xa0;Pa·s was possible. SEM observations revealed the formation of pores that coalesced from approximately 700&#xa0;°C with the formation of viscous flows. Thermal analysis revealed that the rate of off-gassing was approximately 5% for intumescent samples. The released gases remained trapped in the viscous flow, leading to intumescence of the samples, and the phases formed at 800&#xa0;°C were essentially leucite with some potassium ferrate phases. These results indicate that the quantity of geopolymer required to produce intumescent geopolymer can be predicted.</p>

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Development of an intumescent geopolymer coating on steel substrates

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • W. C. N’cho,
  • A. Gharzouni,
  • S. Rossignol

摘要

The aim of this work was to produce a high-temperature-resistant intumescent geopolymer-based coating on steel plates. The coatings were prepared with several expandable additives and heat-treated in a furnace at 800 °C for 30 min. Scanning electron microscopy (SEM) observations were carried out in situ during heat treatment. Furthermore, thermal analysis and X-ray diffraction measurements were performed on the heat-treated samples. The results revealed that producing geopolymer-based coatings with expansion rates of 400% associated with aluminum molar percentages less than or equal to 23.7% and the impact of reactive additives (MK + EA/MK) above 1.20 for viscosity values below 0.65 Pa·s was possible. SEM observations revealed the formation of pores that coalesced from approximately 700 °C with the formation of viscous flows. Thermal analysis revealed that the rate of off-gassing was approximately 5% for intumescent samples. The released gases remained trapped in the viscous flow, leading to intumescence of the samples, and the phases formed at 800 °C were essentially leucite with some potassium ferrate phases. These results indicate that the quantity of geopolymer required to produce intumescent geopolymer can be predicted.