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Chinese Journal of Materials Research  2018, Vol. 32 Issue (1): 17-24    DOI: 10.11901/1005.3093.2017.243
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Effect of Cooling Rate and Al-content on Microstructure and Corrosion Resistance of Zn-Al Alloys Containing Trace Nd
Zujun CAO, Tianyu WENG, Gang KONG(), Chunshan CHE, Yanqi WANG
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
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Zujun CAO, Tianyu WENG, Gang KONG, Chunshan CHE, Yanqi WANG. Effect of Cooling Rate and Al-content on Microstructure and Corrosion Resistance of Zn-Al Alloys Containing Trace Nd. Chinese Journal of Materials Research, 2018, 32(1): 17-24.

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Abstract  

The effect of cooling rate (0.03, 1.08 and 40°C/s) and Al-content on the solidified microstructure and corrosion resistance of Zn-xAl (x=4%, 5%, 7%)-0.06%Nd alloys used for hot-dip galvanizing were examined by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), polarization curves tests and neutral salt spray tests (NSS). The results show that the solidified microstructure of alloys is refined and the eutectic lamellar spacing became smaller as the cooling rate increases, and the corrosion resistance of the alloy increases initially and decreases afterwards with the increase of the cooling rate. Moreover, the addition of Nd can be beneficial to the further reduction of the eutectic lamellar spacing and the improvement of the corrosion resistance of the alloys. Therefore, after air cooling, the Zn-5%Al-0.06%Nd alloy presents the best corrosion resistance. Besides, the variation of Al-content between 4% and 7% caused mainly the change of microstructure, but little effect on the corrosion resistance of the alloys.
Key words:  metallic materials      corrosion resistance      polarization curve      microstructure      cooling rate      Zn-Al alloy     
Received:  10 April 2017     
ZTFLH:  TG146.1  
Fund: Supported by National Natural Science Foundation of China (Nos. 21573077 & 51373055), and International Lead and Zinc Study Group (No. ILZRO/IZA/CN201212)
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Zujun CAO
Tianyu WENG
Gang KONG
Chunshan CHE
Yanqi WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.243     OR     https://www.cjmr.org/EN/Y2018/V32/I1/17

Fig.1  SEM micrographs of Zn-5% Al (a~c) and Zn-5%Al-0.06%Nd (d~f) alloys cooled to room temperature with three kinds of cooling methods (a, d) furnace cooling; (b, e) air cooling; (c, f) water cooling
Fig.2  (a, b) EDS analysis results of A, B points in Fig.1a, respectively
Fig.3  Relationships between lamellar spacing and cooling rate for two alloys
Fig.4  SEM micrographs of air cooled Zn-Al alloys with different Al contents (a) Zn-4%Al; (b) Zn-5%Al; (c) Zn-7%Al; (d) Zn-4%Al-0.06% Nd; (e) Zn-5%Al-0.06% Nd; (f) Zn-7%Al-0.06% Nd
Fig.5  Schematic illustration of the solidification of Zn-5%Al alloy (a) nucleation and growth; (b) bridging growth
Fig.6  Polarization curves of various alloys (a) without Nd and (b) containing Nd in 3.5% NaCl solution
Rare earth Sample Ecorr /V RP /Ωcm2 Icorr /μAcm-2
Without Nd Zn-5%Al (FC) -1.115 4588 3.078
Zn-5%Al (AC) -1.118 8587 2.046
Zn-5%Al (WC) -1.136 4663 2.636
Zn-4%Al (AC) -1.094 5397 2.333
Zn-7%Al (AC) -1.150 6228 2.297
0.06%Nd Zn-5%Al (FC) -1.143 9080 1.761
Zn-5%Al(AC) -1.113 13371 0.984
Zn-5%Al (WC) -1.148 9357 1.530
Zn-4%Al (AC) -1.098 6899 1.783
Zn-7%Al (AC) -1.154 9841 1.677
Table 1  Electrochemical polarization parameters corresponding to Fig.6
Fig.7  NSS results of Zn-5%Al and Zn-5%Al-0.06%Nd alloys with different cooling rates
Fig.8  NSS results of Zn-Al alloys with different Al contents
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