Influence of Tailored Microstructure on the Corrosion Layer Stability in LAE442 Magnesium Alloy
P. Minárika, E. Jablonskáb, R. Krála, J. Veselýa, B. Hadzimac
aDepartment of Physics of Materials, Charles University, Prague, Czech Republic
bDepartment of Biochemistry and Microbiology, University of Chemistry and Technology Prague, Prague, Czech Republic
cUniversity of Žilina, Univerzitná 1, 01026 Žilina, Slovak Republic
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Origins of the increased corrosion resistance of the biodegradable LAE442 magnesium alloy processed by equal channel angular pressing (ECAP) were investigated. Samples of the as extruded and ECAPed conditions were immersed in the minimal essential medium (MEM) for 14 days. Microstructure and chemical composition of the corrosion layer formed on both materials was investigated by scanning electron microscope (SEM) equipped with energy-dispersive spectroscope (EDS). The results showed that a more compact corrosion layer was formed on the ECAPed sample than on the extruded one. It contained a lower amount of cracks and its stability was increased by the high density of aluminium particles formed due to ECAP. Additionally, a thicker layer of CaP was observed in the layer formed on the ECAPed sample. It was concluded that ECAP processing of the LAE442 alloy resulted in significant improvement of the corrosion resistance through substantial enhancement of the protective ability of the corrosion layer.

DOI:10.12693/APhysPolA.134.887
PACS numbers: 81.05.Bx, 81.40.-z, 82.45.Bb, 87.85.-d