4.7 Article

Study on corrosion mechanism of Al-Zn coatings in the simulated polluted marine atmosphere

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Summary: The presence of fluoride impurity at 20 mg/L in zinc sulfate electrolyte significantly increased the corrosion rate of Al-1050 and Al-1070 alloys used as cathodes in zinc electrowinning. The addition of Al3+ ions to the electrolyte reduced the corrosion rate by about 21% for Al-1050 alloy and about 28% for Al-1070 alloy. This effect was attributed to the formation of AlF2+ and AlF2+ complexes, which decreased the activity of fluoride. Electrochemical impedance spectroscopy confirmed the increased corrosion resistance of Al alloys in the presence of Al3+. Scanning electron microscopy revealed uniform corrosion on the surface of Al, with the degree depending on fluoride concentration. The coarser microstructure of Al-1050 contributed to its higher corrosion resistance in a non-passivating media. The selection of effective complexing agent for fluoride and the subsequent reduction in the corrosion rate of aluminum cathodes are important in the context of increasing co-processing of secondary zinc sources.

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