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Open AccessArticle

The Evaluation on Corrosion Resistance and Dross Formation of Zn–23 wt % Al–0.3 wt % Si–x wt % Mg Alloy

by Wangjun Peng 1,2,3, Guangxin Wu 1,2,3,*, Rui Lu 1,2,3, Quanyong Lian 1,2,3 and Jieyu Zhang 1,2,3
1
State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China
2
Shanghai Key Laboratory of Advanced Ferrometallurgy, Shanghai University, Shanghai 200072, China
3
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(3), 199; https://doi.org/10.3390/coatings9030199
Received: 29 December 2018 / Revised: 5 March 2019 / Accepted: 18 March 2019 / Published: 19 March 2019
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection in Extreme Environments)
A comparative study of the corrosive resistance and dross formation of 55Al–Zn–1.6Si (wt %) (55AZS) and 23Al–Zn–0.3Si–xMg (wt %) (23AZS–xMg, x = 0, 1.5, 3) alloys are performed using immersion corrosion and dross formation test, respectively. The result of immersion corrosion testing shows that corrosive rate of the 23AZS alloy is lower than that of 55AZS alloy in the latter stage of immersion and 23AZS–1.5Mg alloy shows the optimal corrosive resistance compared to other alloys relatively. The result of dross formation test shows that the number of bottom dross particle formed in 23AZS–xMg (x = 0, 1.5, 3) alloy is less than that in 55AZS alloy. Moreover, the thermodynamic calculation is performed to reveal the solubility of Fe in the alloys, the result shows the solubility of Fe reduces as a decrease of Al content in the alloy, and the number of dross particle (Fe4Al13 and τ6 (Al9Fe2Si2) phase) generated in 23AZS alloy is more than that in 55AZS alloy. In general, 23AZS–1.5Mg alloy has an advantage of less dross and a certain corrosion resistance and it is expected to be applied for the hot stamping process of coating. View Full-Text
Keywords: 23Al–Zn-0.3Si–xMg (wt %); immersion test; corrosion product; dross formation 23Al–Zn-0.3Si–xMg (wt %); immersion test; corrosion product; dross formation
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MDPI and ACS Style

Peng, W.; Wu, G.; Lu, R.; Lian, Q.; Zhang, J. The Evaluation on Corrosion Resistance and Dross Formation of Zn–23 wt % Al–0.3 wt % Si–x wt % Mg Alloy. Coatings 2019, 9, 199.

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