Abstract
Pure Mg samples were prepared by powder metallurgy using the cold and hot compacting methods. Cold compacted pure Mg (500 MPa/RT) was characterized by 5% porosity and the mechanical bonding of powder particles. Hot compacted samples (100 MPa/400 °C and 500 MPa/400 °C) exhibited porosity below 0.5%, and diffusion bonding combined with mechanical bonding played a role in material compaction. The prepared pure Mg samples and wrought pure Mg were subjected to corrosion tests using electrochemical impedance spectroscopy. Similar material corrosion behavior was observed for the samples compacted at 500 MPa/RT and 100 MPa/400 °C; however, hot compacted samples processed at 500 MPa/400 °C exhibited longer corrosion resistance in 0.9% NaCl solution. The difference in corrosion behavior was mainly related to the different binding mechanisms of the powder particles. Cold compacted samples were characterized by a more pronounced corrosion attack and the creation of a porous layer of corrosion products. Hot compacted samples prepared at 500 MPa/400 °C were characterized by uniform corrosion and the absence of a layer of corrosion products on the specimen surface. Powder-based cold compacted samples exhibited lower corrosion resistance compared to the wrought pure Mg, while the corrosion behavior of the hot compacted samples prepared at 500 MPa/400 °C was similar to that of wrought material.
Highlights
The Mg-based alloys used in the automotive and aerospace industries exhibit good specific strength [1], and studies on them have focused on the reduction of the weight of the components and the subsequent economic and ecological savings
The corrosion process observed here does not fully correspond to the findings presented for HBSS
Electrochemical corrosion properties of pure Mg processed via powder metallurgy were analyzed by electrochemical impedance spectroscopy, and the corrosion behavior was analyzed in terms of metallographic analysis
Summary
The Mg-based alloys used in the automotive and aerospace industries exhibit good specific strength [1], and studies on them have focused on the reduction of the weight of the components and the subsequent economic and ecological savings. Due to their biocompatibility, biodegradability, and nontoxicity, the Mg-based materials are often used for biomedical applications. In comparison with other metallic materials used for biomedical applications (stainless steel and Ti alloys) is the biggest advantage of Mg the mechanical properties very similar to the properties of human bones [1,2,3,4]. While the mechanical properties of a material are mostly predetermined by its nature and structure, influencing the material structure by its processing and by mechanical and thermal treatment are the most useful methods for their tailoring [3,5]. The PM methods allow the tailoring of component mechanical properties due to the large range of applicable pressures, temperatures, distribution of pores and their sizes or shapes, and processing times it employs [1,6]
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