抄録
The fundamental corrosion behavior of conventional AZ-series Mg alloys, i.e. AZ31, AZ61 and AZ91, has been conducted through the electrochemical test to investigate the corrosion behavior of extruded Mg alloys using powders fabricated by roll compaction process (RCP). The corrosion behavior of AZ-series Mg alloys depended on the standard electrode potential of Al content in Mg alloys. And the corrosion resistance has been improved most in AZ91 Mg alloy. The corrosion behavior of extruded AZ31B Mg alloys using powders fabricated by RCP has been also investigated through the polarization test, immersion test and SEM observation in comparison to that of the conventional AZ31W Mg alloy. The extruded AZ31B Mg alloys using RCP powder showed little change in Ecorr irrespective of number of pass cycles. Both anodic and cathodic current density suppression of the RCP specimens became larger with an increase in number of pass cycles. It was also confirmed that the corrosion characteristics of the RCP specimens depended strongly on their structural morphology and that the corrosion resistance of the RCP specimens subjected to 50 pass cycles was nearly same as that of the I/M specimen.
