TY - JOUR AU - Subbotina, Valeriia AU - Bilozerov, Valerii AU - Subbotin, Oleksandr AU - Barmin, Oleksandr AU - Hryhorieva, Svitlana AU - Pysarska, Nataliia PY - 2022/06/30 Y2 - 2024/03/28 TI - Investigation of the influence of electrolyte composition on the structure and properties of coatings obtained by microarc oxidation: Array JF - Physics and Chemistry of Solid State JA - Phys. Chem. Sol. State VL - 23 IS - 2 SE - Scientific articles (Technology) DO - 10.15330/pcss.23.2.380-386 UR - https://journals.pnu.edu.ua/index.php/pcss/article/view/5651 SP - 380-386 AB - <p>Aluminum alloys, along with positive properties - low density, high specific strength, electrical conductivity, ductility, viscosity and others, have disadvantages: low hardness, modulus of elasticity, wear resistance and high chemical activity in many inorganic acids.</p><p>The method of microarc oxidation (MАO) can eliminate these shortcomings. The transformation of the surface layers of the workpiece into high-temperature oxides of aluminum will strengthen the surface and increase its protective properties.</p><p>The properties of MАO coatings depend on many factors, one of which is the composition of the electrolyte. According to the literature, the most widely used alkaline-silicate electrolytes, which have shown the greatest efficiency in MАO of aluminum alloys. The data available in the literature on the use of multicomponent electrolytes containing sodium aluminate NaAlO<sub>2</sub> and sodium hexametaphosphate Na<sub>6</sub>P<sub>6</sub>O<sub>18</sub> do not allow to elucidate their role in the formation of MАO coatings.</p><p>Studies of the use of hexametaphosphate to alkaline silicate electrolyte have shown that Na<sub>6</sub>P<sub>6</sub>O<sub>18 </sub>promotes the formation of a thicker coating. The rate of thickness formation in the absence of hexametaphosphate is 0.5 ,7 0.7 μm / min, and at a hexametaphosphate content of 10 g / l - 0.9 ÷ 1.1 μm / min. As for the effect on the phase composition, the effect was not detected.</p><p>It was studied that the addition of aluminate-silicate electrolytes of sodium aluminate in the amount of up to 13 g / l does not have a significant effect on the thickness of the coating, but affects the phase composition of the coating.</p> ER -