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Epoxy glue coatings based on the ED-20 epoxy-diane resin, filled with nanosized TiO 2 , SiO 2 , Al 2 O 3 and ZnO oxides and applied on an aluminum-magnesium alloy base, are studied by instrumented indentation. Hardness, reduced normal modulus of elasticity and creep are chosen as characterizing parameters. The obtained characteristics are compared with the corresponding values for unmodified glue. It is demonstrated that modification of epoxy glue increases the hardness and reduced the normal modulus of the coating if compared to unfilled glue; however, the degree of increase for each additive is different. In the range of the loading time from 1 to 40 s, at a load of 1 N, all the samples show viscous properties, which are expressed in decreased hardness and lower speed of load application. The magnitude of the reduced normal modulus does not manifest itself as a function of the loading rate. A further increase in the loading time has an insignificant effect on the hardness value for all the samples. The introduction of the TiO 2 , SiO 2 and Al 2 O 3 modifiers does not cause any quantitative change in the creep behavior as compared with the unmodified glue, the creep of these coatings being largely due to the polymer base. In turn, the addition of zinc oxide increases the tendency of the glue to creep, and this is probably due to the plasticizing effect of zinc alkoxides formed on the surface. Petrova A.P., Dementieva L.A., Lukina N.F., Anikhovskaya L.I. Film structural adhesives. Klei. Germetiki. Tekhnologii, 2014, no. 10, pp. 7-12. (In Russian). 3. KeywordsDementieva L.A., Bocharova L.I., Lukina N.F., Petrov A.P. Multifunctional epoxy adhesives for aircraft equipment. Klei. Germetiki. Tekhnologii, 2006, no. 7, pp. 18-20. (In Russian). 4.Kickelbick G. Concepts for the incorporation of inorganic building blocks into organic polymers on a nanoscale. Prog Polym Sci., 2002, no. 28, pp. 83-114. 5.Rahman A., Ali I., Al Zahrani S., Eleithy R.H. A review of the applications of nanocarbon polymer composites. NANO Brief Rep. Rev., 2011, no. 6, pp. 185-203. 6.Deesy Pinto, Luís Bernardo, Ana Amaro, Sérgio Lopes. Mechanical properties of epoxy nanocomposites using titanium dioxide as reinforcement. Construction and Building Materials, 2015, no. 95, pp. 506-524. 7.Allahverdi Ali, Ehsani Morteza, Janpour Hadi, Ahmadi Shervin. The effect of nanosilica on mechanical, thermal and morphological properties of epoxy coating. Progress in Organic Coatings, 2012, no. 75, pp. 543-548. 8.Wichmann M., Cascione M., Fiedler B., Quaresimin M., Schulte K. Influence of surface treatment on mechanical behaviour of fumed silica/epoxy resin nanocomposites.

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The Primer 204 epoxy resin with different contents of silica dioxide nanoparticles is investigated by microindentation. The effect of loading time and particles distribution inside the polymer matrix on Martens hardness is examined. The creep of epoxy resin at various hold times is investigated. A quantitative relation of the micromechanical properties to the volume content of silica dioxide nanoparticles is established. The processed experimental data has demonstrated that the test material exhibits viscous properties manifested in the presence of creep. Science, 2015, vol. 67, pp. 1-94. DOI: 10.1016/j.pmatsci.2014. Oliveira G.L., Costa C.A., Teixeira S.C.S., Costa M.F. The use of nano-and microinstrumented indentation tests to evaluate viscoelastic behavior of poly (vinylidene fluoride) (PVDF). Polymer Testing, 2014, vol. 34, pp. 10-16. DOI: 10.1016/j.polymertesting.2013 Fascea L.A., Seltzer R., Frontini P.M. Depth sensing indentation of organic-inorganic hybrid coatings deposited onto a polymeric substrate. Surface & Coatings Technology, 2012, vol. 210, pp. 62-70. DOI: 10.1016/j.surfcoat.2012 Ngan A.H.W., Wang H.T., Tang B., Sze K.Y. Correcting power-law viscoelastic effects in elastic modulus measurement using depth-sensing indentation.