Elucidating the role of micro-galvanic coupling between eutectic alpha-Mg lamellas and alpha-Mg matrix on the hydrogen evolution behaviour of Mg-0.6Ca binary alloy using real-time imaging

The hydrogen evolution process in the as-cast Mg-0.6Ca alloy was investigated using real-time optical imaging of the corroding surface. It was revealed that hydrogen evolved as large stable bubbles and continuous streams of tiny bubbles because of high localised current density. To the best of the author's knowledge, this is the first attempt to characterise the hydrogen evolution behaviour of Mg-Ca binary alloy employing a mechanistic model based on real-time imaging.