Abstract
: 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 6 (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.
Highlights
The cost of material suffering corrosion occupies around 4% of the GDP of an industrialized nation’s economy, which greatly promotes international research in material corrosion
The salt immersion test is used to evaluate the corrosive resistance of Zn–Al alloy and the results show the corrosive resistance of
In the study of Zhu [24], the neutral salt spray and electrochemical test are performed to evaluate the corrosive resistance of the 23Al–Zn–0.3Si coating, and the results show that Mg can improve the corrosive resistance and the formability of 23Al–Zn–0.3Si coating
Summary
The cost of material suffering corrosion occupies around 4% of the GDP of an industrialized nation’s economy, which greatly promotes international research in material corrosion. The stability of a material will depend on the protective properties of the surface film formed, if the material is exposed to specific aggressive media [1] In such a sense, steel electrochemistry protection by means of coating is widely used in various fields, owing to the Al–Zn coating combining the durability of aluminum and the cathodic protection of zinc, for more long-term atmospheric corrosion resistance, and better coating performance and good resistance to high-temperature oxidation, and it has been widely used in bridges, buildings, automobiles, and other industries. As a high Al content coating, is widely used and has received extensive attention It will experience a severe reaction of iron dissolution in a zinc pot at a high temperature of 600 ◦ C when the steel plate contacts the zinc bath.
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