Microstructure and corrosion behavior of die-cast AM60B magnesium alloys in a complex salt solution: A slow positron beam study

摘要

The microstructure and corrosion behavior of high pressure die-cast (HPDC) and super vacuum die-cast (SVDC) AM60B magnesium alloys were investigated in a complex salt solution using slow positron beam technique and potentiodynamic polarization tests. The experiments revealed that a CaCO)3 film was formed on the surface of the alloys and that the rate of CaCO_3 formation for the SVDC alloy with immersion time was slower than that of the HPDC alloy. The larger volume fraction of p-phase in the skin layer of the SVDC alloy than that of the HPDC alloy was responsible for the better corrosion resistance.