Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 25    No. 12    December 2015

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Effect of equal-channel angular pressing and aging oncorrosion behavior of ZK60 Mg alloy
Xin LI1, Jing-hua JIANG2, Yong-hao ZHAO1, Ai-bin MA2, Dao-jing WEN1, Yun-tian ZHU1,3

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

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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