Effects of solution treatment on the biocorrosion properties of Mg-2Nd-0.5Zn-0.4Zr-1Y magnesium alloy

摘要

Effects of solution treatment on the microstructures of Mg-2Nd-0.5Zn-0.4Zr-1 Y magnesium alloys were investigated by scanning electronic microscope (SEM) and energy spectrum analysis (EDS).The biocorrosion properties in the simulated body fluid (SBF) were evaluated by means of hydrogen evolution, mass loss experiments and electrochemical methods.The results indicate that most of the precipitated phase was soluble in matrix and tends to be in homogeneous distribution after solution treatment.Meanwhile, the corrosion potential shifts to positive and the corrosion current density is lowered observably, which indicates an improvement of the biocorrosion properties of the alloys.Furthermore, the corrosion rate of alloys after solution treatment first decreases and then slightly increases with the increasing solution temperature.The optimum biocorrosion properties was obtained when the solution temperature is 500 ℃, where the corrosion rate in SBF was 0.7230 mm/a, only 68.81％ of the as-cast alloys.