Luminescent micro-photo-images (MPI) for digitalizationof diffusant penetration into epoxy binders and adaptivecomposites for anticorrosive coatingsстатья
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Аннотация:Int. J. Corros. Scale Inhib., 2025, 14, no. 4, 2379-2396 1Luminescent micro-photo-images (MPI) for digitalizationof diffusant penetration into epoxy binders and adaptivecomposites for anticorrosive coatingsV.A. Shchelkov and A.B. Il’in *Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academyof Sciences, 31-4, Leninsky prospect, 119071 Moscow, Russia*E-mail: ilinab@list.ruAbstractDiffusion studies of the penetration of phosphoric acid, dimethyl sulfoxide, and methyl ethylketone solutions into modified amine-cured epoxies were conducted. For an exposure time of11.568 hours at +50°C, the penetration depth of 60% of the phosphoric acid was determinedusing local X-ray spectral analysis, micro-luminescence spectroscopy, and the luminescent dropindicator method. The outer zone of polymer fluorescence change causes internal stressesarising from phosphoric acid swelling in the region ahead of the acid penetration front boundaryof 1237 μm and with a radius of approximately 20 μm. Differences in the appearance of a visiblestate in the “green”, “blue”, and “red” color sectors were revealed due to the fluorescencediffusion zone and the region of the original polymer preceding it. Transmission distributionhistograms were constructed for modifying composite microcapsules containing an inhibitorblock, enabling digitalization of the process flow and calibration sieving modes for themicroencapsulated inhibitor code. Focused images with highly developed reflection relief wereconstructed for multiple time exposures, resulting in a series of high-resolutionmicrophotographs (4096×3288 pixels). It has been shown that under various spectral conditionsof fluorescence observation (UV (ultraviolet) 250–290 nm/330–400 nm, V (violet-blue) 395–415 nm/420–500 nm, B (blue) 420–485 nm/480–700 nm and G (green) 460–550 nm/600–700 nm) of epoxy binders and soft composites exposed in phosphoric acid or dimethylsulfoxide, it is possible to digitalize photomicrographs (PMI) (Altami LUM-1-LED microscope;Altami UCMOS-14000-KPA video camera; Altami Studio software) for multifractal analysis