Improved barrier effect of hierarchical micro-nano precipitate framework in magnesium-aluminum alloy for corrosion mitigation

Abstract

The galvanic effect of second phases in Mg alloys often does harm to corrosion resistance. Here, a hierarchal micro-nano β phase framework is proposed to improve the barrier effect of the second phase in high-aluminum-containing Mg-Al alloy, which can be achieved through facile heat treatment. Compared to pristine and solid-solution-processed β phases, this designed β phase framework effectively mitigates the corrosion in 0.6 M NaCl solution because of the formation of a brick-and-mortar structured corrosion product layer.