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Weather Resistance of Organosilicate Coatings in a Tropical Climate Depending on the Choice of the Pigment

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Abstract

The results of a study of the weather resistance of protective and decorative organosilicate coatings prepared using organosilicate compositions based on polydimethylphenylsiloxane as a binder and hydrosilicates as fillers are presented. The color of the coatings varies due to the use of pigments: natural FeOx minerals of yellow, red-brown, and brown shades of flowers. Using X-ray phase and X-ray fluorescence (XRF) analysis, it is established that the composition of minerals is primarily determined by iron oxides in the crystalline modification of hematite (α-Fe2O3) and goethite (α-FeO(OH)). Pigments contain a small number of impurity compounds of a number of elements that contribute to the color range of the coatings. Organosilicate coatings are exposed for 11 months in the tropical climate of two climatic zones of Vietnam (in the suburbs of Nha Trang and Ho Chi Minh City). The high corrosion resistance and color stability of the coatings are established during the entire test period. According to slight changes in the color and gloss, revealed by spectrophotometric and photoelectric methods, it is shown that higher resistance to solar radiation and other adverse climatic factors is typical for coatings with a brown pigment based on hematite; and the lowest, with a yellow pigment based on goethite.

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ACKNOWLEDGMENTS

Atmospheric full-scale tests were carried out on the base of the Russian-Vietnamese Research and Technological Tropical Center, and the XRF analysis was carried out on the equipment of ITMO University.

Funding

This study was supported within the research project 0081-2022-0006 of the Institute of Chemical Chemistry of the Russian Academy of Sciences and a subsidy from the Russian Ministry of Education and Science.

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Authors and Affiliations

  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    V. I. Voshchikov, L. N. Krasil’nikova, A. M. Nikolaev & O. A. Shilova

  2. Coastal Branch, Joint Vietnam–Russia Tropical Science and Technology Research Center, 5712, Nha Trang, Vietnam

    Chi Văn Nguyên

  3. St. Petersburg State Electrotechnical University “LETI”, 197022, St. Petersburg, Russia

    O. A. Shilova

  4. ITMO University, 199034, St. Petersburg, Russia

    V. A. Aseev

Authors
  1. V. I. Voshchikov
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  2. L. N. Krasil’nikova
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  3. Chi Văn Nguyên
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  4. A. M. Nikolaev
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  5. V. A. Aseev
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  6. O. A. Shilova
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Correspondence to V. I. Voshchikov or O. A. Shilova.

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Voshchikov, V.I., Krasil’nikova, L.N., Nguyên, C.V. et al. Weather Resistance of Organosilicate Coatings in a Tropical Climate Depending on the Choice of the Pigment. Glass Phys Chem 49, 693–700 (2023). https://doi.org/10.1134/S1087659623600680

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  • DOI: https://doi.org/10.1134/S1087659623600680

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