FORMATION, STRUCTURE AND PROPERTIES OF MODIFIED WITH FORSTERITE MICROARC OXIDATION COATING ON МЛ10 (ML10) MAGNESIUM ALLOY

The structure, phase composition, microhardness, and adhesive strength of a coating on an МЛ10 (ML10) magnesium alloy modified with Mg2SiO4 forsterite during microarc oxidation (MAO) have been studied. Sodium silicate additives were used as a forsterite precursor. A pattern has been established that reflects the minimum concentration of sodium silicate in the electrolyte composition, at which silicon compounds participate in the formation of a ceramic coating on magnesium and are introduced into it, forming complex compounds (Mg2SiO4). With the chosen MAO parameters and the basic composition of the electrolyte, the modification with silicon compounds begins with a concentration of sodium silicate in the electrolyte of 4 g/l. It has been established that at this concentration, a developed interface is formed, which increases the adhesive strength of the coating. In addition, the presence of forsterite in the coating leads to an increase in the thickness and microhardness of the coating.