Sacrificial Mg film anode for cathodic protection of die cast Mg–9 wt.%Al–1 wt.%Zn alloy in NaCl aqueous solution

An Mg film was coated on one side of an Mg–9 wt.%Al–1 wt.%Zn (AZ91D) sample to form a galvanic couple in NaCl aqueous solution. The sacrificial Mg film anode cathodically protected the AZ91D substrate, because the mixed potential of the Mg coating/AZ91D couple was more anodic than the corrosion potential of the substrate.