Fig. 2: Morphology and element distribution of corrosion product films in the W11 and WA111 alloys, respectively.
From: Towards development of a high-strength stainless Mg alloy with Al-assisted growth of passive film

a As-cast W11 binary alloy soaked for 1 day; b as-cast WA111 alloy soaked for 1 day; c as-cast WA111 alloy soaked for 14 days.