Effect of equal-channel angular pressing and aging on corrosion behavior of ZK60 Mg alloy

被引：41

作者：

Li, Xin ^{[1
]}

Jiang, Jing-hua ^{[2
]}

Zhao, Yong-hao ^{[1
]}

Ma, Ai-bin ^{[2
]}

Wen, Dao-jing ^{[1
]}

Zhu, Yun-tian ^{[1
,3
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China

[2] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China

[3] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2015年 / 25卷 / 12期

关键词：

ZK60 Mg alloy; equal-channel angular pressing; aging; corrosion resistance; fine-grains; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; THIN ELECTROLYTE LAYERS; AZ91D MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; ATMOSPHERIC CORROSION; GRAIN-REFINEMENT; ZR ALLOY; MICROSTRUCTURE; METALS; ECAP;

D O I：

10.1016/S1003-6326(15)64038-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 (J(corr)) in the polarization curves, lower charge-transfer resistance (R-t) 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 (phi(corr)), 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.

引用

页码：3909 / 3920

页数：12

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