| Abstract Scope |
Amorphous metals and alloys have attracted increasing interest in various industries due to their high hardness, fracture strengths, elasticity limit, and corrosion resistance. While traditional precipitation-strengthened alloys typically suffer from the strength-corrosion resistance tradeoff, amorphous metals often exhibit excellent corrosion resistance, largely owing to the lack of secondary phases, the absence of grain boundary, and the retention of high alloying content in homogenous solid solution. In this study, the effects of manganese (Mn) on the corrosion resistance of amorphous Al-Mn was studied using experiments and atomistic simulation. It was found that Mn addition enhanced the corrosion resistance of Al without participating in the surface oxidation. The selective dissolution of Mn was believed to increase the free volume at the metal/oxide interface to facilitate the formation of a denser, thinner oxide layer with closer to stoichiometry composition and enhanced barrier characteristics against corrosion. |