Effect of equal-channel angular pressing and aging oncorrosion behavior of ZK60 Mg alloy
(1. School of Materials Science and Engineering, Nanjing University of Science and Technology,
Nanjing 210094, China;
2. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;
3. Department of Materials Science and Engineering, NC State University, Raleigh 27695, USA)
Nanjing 210094, China;
2. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;
3. Department of Materials Science and Engineering, NC State University, Raleigh 27695, USA)
Abstract: Commercial ZK60 Mg alloy was processed by multi-pass equal-channel angular pressing (ECAP) and subsequent aging to investigate the effect of grain refinement and second-phase redistribution on its corrosion behavior. Electrochemical tests show that the fine-grained samples after more ECAP passes have higher corrosion current densities (Jcorr) in the polarization curves, lower charge-transfer resistance (Rt) values in the EIS plots. The severe plastic deformation decreases the alloy corrosion resistance besides the well-known strengthening and toughening. Scanning Kelvin probe (SKP) measurement shows that the anodic and cathode sites are homogeneously distributed on the surface of the fine-grained alloy, which inhibits localized corrosion. The SKP potential, having linear relationship with the corrosion potential (φcorr), decreases with increasing the ECAP pass. Furthermore, the post-ECAP aging can slightly improve the corrosion resistance of the fine-grained ZK60 Mg alloy and enhance the comprehensive performances, due to the stress relief and uniform distribution of second-phase particles.
Key words: ZK60 Mg alloy; equal-channel angular pressing; aging; corrosion resistance; fine-grains