Manufacture and Characterization of Geopolymer Coatings Deposited from Suspensions on Aluminium Substrates

Novotný, Jan; Jaskevič, Martin; Mamoń, Filip; Mareš, Jakub; Horký, Roman; Houska, Pavel

doi:10.3390/coatings12111695

Cited by 6 publications

(18 citation statements)

References 42 publications

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“…This work follows our previous research [23,24] and expands our knowledge about the selected single-and multi-layer GP coatings with different applications by brushes and some types of curing processes. We observed changes in the visual quality of the prepared GP coatings and changes in their mechanical properties.…”

Section: Introductionmentioning

confidence: 64%

“…The GP coating was selected based on our previous research [23,24]. The selected GP had good properties, which was a good starting point for the following complex research creating multi-layer GP coatings.…”

Section: Methodsmentioning

confidence: 99%

“…Geopolymer suspensions I and J were selected from previous research for their interesting properties on the Al substrate [23], where geopolymer I reached an average coating thickness of 2.7 µm and geopolymer J reached one of only 1.5 µm. Both suspensions had excellent adhesion to the Al substrate.…”

Section: Preparation Of the Suspensions And Underlying Substratementioning

confidence: 99%

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Thickness, Adhesion and Microscopic Analysis of the Surface Structure of Single-Layer and Multi-Layer Metakaolin-Based Geopolymer Coatings

Jaskevic,

Novotny,

Mamon

et al. 2023

Coatings

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This work is focused on creating coating layers made of a metakaolin-based geopolymer suspensions (GP)-formed Al matrix modified using H3PO4 acid with Al(OH)3 in isopropyl alcohol, named GP suspension I, and H3PO4 acid with nano Al2O3 in isopropyl alcohol, named GP suspension J. The selected GP suspensions were applied on aluminum and steel underlying substrates as single-layer coatings and multi-layer coatings, where multi-layer coatings included three and five layers that were polymerized by a curing process. Curing was divided into two types with every layer curing process and final layer curing process. For both GP suspensions I and J, the effect of the number of layers and the type of substrate on adhesion was investigated. The prepared samples on underlying substrates were characterized on the microscopy analysis including SEM for high-resolution images and 3D laser confocal microscopy (CLSM) for the 3D visualization of the coatings structure. Microscopy analysis showed structural defects such as porosity, cracks and peeling, which increase with a greater number of applied layers. However, these defects were only evident on a micro scale and did not seem to be fatal for the performance of the surface stability. The EDS mapping of the prepared layer showed inhomogeneity in the distribution of elements caused by the brush application. A grid test and thickness measurement were performed to complete the microscopy analysis. The grid test confirmed a very high adhesion of GP coatings on the aluminum substrate with a rating of one (only in one case was there a rating of two) and a lower adhesion on the steel substrate with the most frequent rating of three (in one case, there were ratings of two and one). The thickness measurement proved a noticeably thicker thickness of the prepared layer on the Fe substrate compared to the Al substrate by 20%–30% in the case of suspension I and by 70%–10% in the case of suspension J. The thickness of the layer also showed a dependence on the method of application and curing, as a thicker layer was always achieved when curing after the final layer of the GP suspension, compared to curing after each applied layer. The resulting single-layer and multi-layer thicknesses ranged from approx. 7 to 30 µm for suspension I and from approx. 3 to 11 µm for suspension J. A non-linear increase in thickness was also evident from the thickness measurement data.

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Section: Introductionmentioning

confidence: 64%

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of the Suspensions And Underlying Substratementioning

confidence: 99%

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Thickness, Adhesion and Microscopic Analysis of the Surface Structure of Single-Layer and Multi-Layer Metakaolin-Based Geopolymer Coatings

Jaskevic,

Novotny,

Mamon

et al. 2023

Coatings

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“…Thys suspensions is usable for insoluble heat and corrosion resistant coatings. Our previous research also shown that the selected geopolymer suspensions adhesion was at a very high level [17]. The fire resistance of geopolymer suspensions for non-metallic substrates was analyzed on XPS and DTD substrates.…”

Section: Discussionmentioning

confidence: 95%

Fire Resistance Test of Geopolymer Coatings on Non-Metallic Underlying Substrates

Mamoń¹,

Jaskevič²,

Mareš³

et al. 2023

Manufacturing Technology

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This article summarizes the results from the fire resistance test of geopolymer suspensions in the form of coatings on non-metallic substrates. Their heat resistance was evaluated based on the burn-through time compared to the uncoated substrate. Non-metallic substrate materials, extruded polystyrene (XPS) and chipboard (DTD) were chosen as the underlying substrates for GP suspension research. Parameters from the fire resistance test as fire test duration of geopolymer coatings and percentage increase in burn time of geopolymer coatings on an XPS and DTD substrates compared to an uncoated substrate were evaluated. One of the discussed point was also the addition of CaCO 3 and Al(OH) 3 for studding flame retardancy effect. Geopolymer Coatings Fire resistance test Non-metallic substrate Flame retardancy

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“…For the geopolymer mixtures geopolymerization occurs at elevated temperatures, in contrast to mixtures with a different composition, where geopolymerization can occur at lower temperature [19,20]. For the selected geopolymer mixtures, it is necessary to reach a certain minimum temperature, which was experimentally determined to be 170 °C [21]. This temperature is important parameter influencing the resulting quality of the coatings.…”

Section: Fig 1 Scheme Of Preparation Gp Coatings and Measurment Of Al...mentioning

confidence: 99%

Adhesion of Various Geopolymers Coatings on Metal Substrates

Mareš¹,

Mamoń²,

Jaskevič³

et al. 2023

Manufacturing Technology

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This article deals with adhesion of various alkali-activated metakaolin-based geopolymer coatings on structural steel 1.0038 (according to EN 10025-2). This steel alloy was chosen in order to analysis adhesion of prepared geopolymer coatings. Our samples were characterized by laser and SEM microscopy and grid test was performed. Microscopy was performed to get knowledge about visible characterization and overall quality of prepared coatings. Based on previous research SEM results correspond with properties changes in coatings and their classification of grid test. Grid test was performed and results was evaluated. These results show potential of our prepared GP and could be used as base for further research and possible application as anti corrosion coatings in construction or fire-resistant barriers. The aim of the research was to prepare alkali-activated metakaolin-based geopolymer on a structural steel substrate, to evaluate the visual quality of the coatings and to evaluate the results of the grid test. GeopolymerStructural steel Microstructure Grid test Adhesion

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Manufacture and Characterization of Geopolymer Coatings Deposited from Suspensions on Aluminium Substrates

Cited by 6 publications

References 42 publications

Thickness, Adhesion and Microscopic Analysis of the Surface Structure of Single-Layer and Multi-Layer Metakaolin-Based Geopolymer Coatings

Thickness, Adhesion and Microscopic Analysis of the Surface Structure of Single-Layer and Multi-Layer Metakaolin-Based Geopolymer Coatings

Fire Resistance Test of Geopolymer Coatings on Non-Metallic Underlying Substrates

Adhesion of Various Geopolymers Coatings on Metal Substrates

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