Corrosion degradation of Mg-0.8Ca bioresorbable alloy in the mammalian cell culture medium
The paper presents results of study of electrochemical activity of the Mg-0.8Ca bioresorbable alloy in a medium for the cultivation of mammalian cells - the minimum essential medium (MEM). The highest corrosion activity of the alloy was revealed at the initial stage of exposure in the solution (for the first 12 minutes). The mechanism of corrosion degradation of material has been determined and it is characterized with initiation of the destruction at grain boundaries caused by the formation of micro-galvanic couples. It is explained by the presence of Mg2Ca intermetallic phase which is anodic against α- magnesium matrix. A model of formation of corrosion products layer on alloy`s surface during the exposition in MEM solution is proposed.