ASSESSMENT OF THE ADHESION STRENGTH OF DETONATION-SPRAYED METAL-CERAMIC COATINGS ON CONCRETE SUBSTRATES

Daniil Sergeevich Podgorny, Diana Olegovna Bondarenko, Valeria Valerievna Strokova

Abstract


Introduction. The efficiency and successful application of various protective coatings necessitate the investigation of coating–substrate interactions to ensure durability and reliability. Adhesion is a key parameter that determines the quality of bonding between a coating and a substrate surface. Existing methods for its assessment are continually being improved to enhance accuracy, versatility, and applicability to various types of coatings and substrates. Purpose of the study. The study is aimed at assessing the adhesion strength of coatings deposited by detonation spraying onto heavy-concrete surfaces and refining the methodology for determining adhesion strength for the corresponding tests. Methods. In the course of the study, Raman spectroscopy, axial pull-off adhesion testing, optical microscopy, and rotational viscometry were used. Results. Adhesion strength tests were performed on Ti–TiOx coatings deposited on concrete substrates by detonation spraying of powders under different modes. The resulting coatings exhibit high adhesion strength to the substrate, ranging from 0.32 to 3.77 MPa, and low porosity. A special fixture was pre-developed for adhesion testing of specimens with linear dimensions of 30 mm and larger. A study was conducted on the applicability of a series of epoxy resins for adhesion testing. It was found that, when testing coatings on porous substrates, it is important to consider the viscosity of the adhesive agents, since highly mobile formulations may penetrate deeply into the specimen and distort the results.

Keywords


adhesion strength; coatings; concrete; adhesion testing methodology; epoxy resin

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References


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