Mitigating the detrimental effects of galvanic corrosion by nanoscale composite architecture design

• DOI: 10.1038/s41529-022-00256-y
• Publication Date: 2022-06-16T10:23:15Z
• Authors: Oliver Renk; Irmgard Weißenste...; Martina Cihova; Eva-Maria Steyskal; Nicole G. Sommer; Michael Tkadletz; Stefan Pogatscher; Patrik Schmutz; Jürgen Eckert; Peter J. Uggowitzer; Reinhard Pippan; Annelie M. Weinberg
• Keywords: Galvanic cell; Galvanic corrosion

Abstract Widespread application of magnesium (Mg) has been prevented by its low strength and poor corrosion resistance. Core this limitation is Mg’s electrochemical potential solubility for most elements, favoring secondary phase precipitation acting as effective micro-galvanic elements. Mg-based metal–metal composites, while benefiting strength, are similarly active galvanic couples. We show that related detrimental susceptibility overcome nanoscale composite architecture design. Nanoscale spacings enable high-strength Mg–Fe composites with degradation rates ultra-high purity Mg. Our concept thus fundamentally changes today’s understanding significantly widens the property space materials.