The anticorrosive performance of pulse electrodeposited Zn-Mn deposits was investigated according to the salt spray test DIN EN ISO 9227, commonly used in the automotive industry. A comprehensive analysis of the corrosion products was conducted on the surface and cross-sections via X-ray diffraction and scanning electron microscopy to define the corrosion mechanisms involved. The results revealed a significant enhancement of the anticorrosive performance of Zn-Mn deposits over commercial Zn through a complex corrosion mechanism. The protective coating evolves continuously with exposition time. A preferential dissolution of Mn is observed leading to the formation of a compact layer of zinc hydroxychloride. Moreover, an overlayer of manganese oxide and zinc oxide is highlighted at prolonged exposures due to an increase in interface pH.
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