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| Corrosion Behavior of Equal-channel-angular-pressedZn-22Al Alloys in NaCl Aqueous Solution |
| ZENG Xuduo, YANG Lijing, ZHANG Yangming, SONG Zhenlun |
| Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China |
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Abstract The influence of equal-channel-angular-press (ECAP) process on the corrosion behavior of Zn-22Al alloy in 3.5% (mass fraction) NaCl solution has been studied by means of immersion test and electrochemical measurement. The results showed that the microstructure of the alloy was refined by ECAP process with much uniform grain size distribution rather than that of the as-cast one. Al-rich phase of the ECAP alloy was preferentially corroded in the corrosion process, leading to the isolation and then falling off from the alloy of the Zn-rich phase surrounded by Al-rich phase, therewith the corrosion rate was enhanced. This phenomenon might be ascribed to the increase of grain boundaries, stress and defects of the alloy induced by ECAP process. In general, with the increasing pass of ECAP, the weight loss of the alloy in immersion test increased, while the corrosion current density increased and the corrosion potential decreased, therewith the corrosion resistance was degraded with the increasing ECAP pass for the alloy.
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Received: 13 May 2013
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