Effect of cooling rate on the microstructure and corrosion properties of Zn-5Al-0.1RE-<i>x</i>Si alloys

TU Hao; WEI Da-sheng; ZHOU Sheng-jie; LIU Ya; WU Zhang-jun; SU Xu-ping; WANG Jian-hua

doi:10.13374/j.issn2095-9389.2016.08.012

Volume 38 Issue 8

Jul. 2021

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Article Navigation > Chinese Journal of Engineering > 2016 > 38(8): 1132-1138

TU Hao, WEI Da-sheng, ZHOU Sheng-jie, LIU Ya, WU Zhang-jun, SU Xu-ping, WANG Jian-hua. Effect of cooling rate on the microstructure and corrosion properties of Zn-5Al-0.1RE-xSi alloys[J]. Chinese Journal of Engineering, 2016, 38(8): 1132-1138. doi: 10.13374/j.issn2095-9389.2016.08.012

Citation:

TU Hao, WEI Da-sheng, ZHOU Sheng-jie, LIU Ya, WU Zhang-jun, SU Xu-ping, WANG Jian-hua. Effect of cooling rate on the microstructure and corrosion properties of Zn-5Al-0.1RE-xSi alloys[J]. Chinese Journal of Engineering, 2016, 38(8): 1132-1138. doi: 10.13374/j.issn2095-9389.2016.08.012

Citation:

TU Hao, WEI Da-sheng, ZHOU Sheng-jie, LIU Ya, WU Zhang-jun, SU Xu-ping, WANG Jian-hua. Effect of cooling rate on the microstructure and corrosion properties of Zn-5Al-0.1RE-xSi alloys[J]. Chinese Journal of Engineering, 2016, 38(8): 1132-1138. doi: 10.13374/j.issn2095-9389.2016.08.012

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Effect of cooling rate on the microstructure and corrosion properties of Zn-5Al-0.1RE-xSi alloys

doi: 10.13374/j.issn2095-9389.2016.08.012

TU Hao^1,2,
WEI Da-sheng^1,2,
ZHOU Sheng-jie^1,2,
LIU Ya^1,2,
WU Zhang-jun^1,2,
SU Xu-ping^{1,2,3
,
,},
WANG Jian-hua^1,2,3

1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China;
3. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, China

Received Date: 2016-03-09
Available Online: 2021-07-22

Abstract

Abstract

The effects of cooling rate and Si on the microstructure and corrosion property of the Zn-5Al-0.1 RE alloy were studied by scanning electron microscopy-energy dispersive spectrometry, X-ray diffraction, neutral salt spray test and polarization curves. The results show that Zn-5Al-0.1RE-xSi alloys are composed of primary η-Zn phase and η-Zn + α-Al eutectic structure, and the former is uniformly distributed on the adjacent η-Zn + α-Al entectic cells. The reduction of cooling rate and the addition of Si make the grain size increase and the boundary area per unit alloy area decrease; at the same time, the corrosion resistance is improved. The corrosion resistance of the Zn-5Al-0.1 RE-xSi alloys is dependent on their solidification structure and the relative amount of corrosion products including Zn₅(OH)₈Cl₂·H₂0 and ZnO.
- zinc aluminum alloys,
- cooling rate,
- microstructure,
- corrosion resistance,
- silicon,
- hot dip galvanizing