Authors:
Hanna Nilsson Åhman (Swerim AB, Sweden),
Clarence Wahman (Uppsala University, Sweden),
Cecilia Persson (Uppsala University, Sweden)
Abstract:
Powder bed fusion – laser beam (PBF-LB) of Mg-Y-Nd-Zr alloys has recently been gaining increasing attention for the development of biodegradable orthopedic implants with optimized mechanical properties and enhanced biocompatibility. However, the corrosion rates remain too high. Thus, the goal of this study was to investigate the influence of the laser power on the structure and microstructure of as-built Mg-Y-Nd-Zr surfaces and the resulting corrosion properties over 28 days. Samples were produced with three different laser powers (60W, 80W and 90W), while keeping all other parameters constant. The 60W samples had the best corrosion resistance, despite having a higher surface roughness. At higher energy input there is an increase in magnesium evaporation, which causes an increase in the amount and size of secondary phases, and thus an increased micro galvanic corrosion. This study gives an important insight into the influence of the PBF-LB process on the corrosion properties of Mg-Y-Nd-Zr alloys.
DOI:
https://doi.org/10.59499/WP225372066