Abstract
In the process of hot-dip galvanizing, components working in liquid zinc for a long period of time naturally corrode and fail prematurely. Meanwhile, Cr and Al elements can be used to improve the corrosion resistance of Fe-B alloy in Zn liquid, unfortunately, the α-Fe matrix still gets preferentially corroded. In this work therefore, pre-oxidation is performed under a low oxygen pressure to form oxides of Cr2O3, Al2O3 and FeCr2O4 on the surface of the alloy, which effectively prevents the diffusion of zinc liquid. The oxidation behavior of Fe-5B–20Cr-3Al alloy at 850 °C is then analyzed by thermodynamic calculation and experimentally studied. The corrosion properties of the pre-oxidized alloy in Zn-55 wt% Al liquid and pure zinc liquid are subsequently investigated. Findings revealed that the oxide film forms under oxygen pressure of 10−20.5 atm. is dense, and the thickness reaches 8 µm. Moreover, FeCr2O4 and a small amount of B and Cr oxides are distributed in the upper part of the oxide film, coupled with internal oxidation of Al2O3 on the α-Fe phase. These ensure the continuity and compactness of the oxide film, thus exhibiting the best corrosion resistance to zinc liquid and zinc aluminum liquid. Consequently, pre-oxidation of Fe-5B–20Cr-3Al alloy under low oxygen pressure at 850 °C is proposed as an efficient method to ensure corrosion resistance of the alloy in a zinc-aluminum solution.
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