Corrosion behaviour of WE43 magnesium alloy printed using selective laser melting in simulation body fluid solution

Biodegradable WE43 Magnesium Alloy Produced by Selective Laser Melting: Mechanical Properties, Corrosion Behavior, and In-Vitro Cytotoxicity

“…This means that they consist mainly of mixed calcium-magnesium phosphates and carbonates. Similar findings have been reported by other authors [36,[57][58][59][60]. The mechanism of alloy corrosion in SBF includes several chemical reactions, which can be expressed by the following simplified equations [4,15,16,61]: In terms of biocompatibility, the formation of phosphates during corrosion facilitates bone tissue ingrowth and good osseointegration of the 3D-printed implant with bone because of the similarity between the corrosion products and the inorganic part of the human bone [3,5,57,58,62,63].…”

“…In this study, WE43 alloy prepared by SLM method was investigated. The input material was WE43 powder atomized with an inert gas (the analysis of this powder is presented in [35,36]. The bulk material was produced from powder by SLM process on an SLM 280HL machine (SLM Solutions Group AG, Lübeck, Germany) equipped with YLR-Laser (IPG Photonics, Oxford, MA, USA) with a wavelength of 1060 nm.…”

“…It can be seen that this material has a relatively coarse microstructure composed of α-Mg dendrites (dark) and eutectic mixture (light) in the interdendritic regions. According to EDS and XRD analysis (not shown), the eutectic is mainly enriched in Nd and contains α-Mg + β-Mg 41 Nd 5 phases [36,40]. In the β intermetallic phase, Nd is partially substituted by Y and other RE elements and can thus be written as β-Mg 41 (Nd, Y) 5 .…”

“…The volume fraction of porosity was measured by imaging analysis on several cross-sections of the material and was determined to be 0.6 vol.%. Residual porosity is an intrinsic property of materials produced by SLM and can result from several phenomena such as (i) gas entrapped in the powder during SLM; (ii) local superheating and evaporation of the alloy due to high laser power density; (iii) local imperfect melting and bonding of powder particles due to insufficient laser power density and other factors [10,36,[45][46][47][48][49][50]. In our case, the volume of residual porosity is very low, indicating that the laser beam parameters in the SLM process were selected and controlled properly.…”

Microstructural Origins of the Corrosion Resistance of a Mg-Y-Nd-Zr Alloy Processed by Powder Bed Fusion – Laser Beam

“…Moreover, the corrosive medium did not contain neither Ca nor P, which have an important influence on the degradation properties of Mg alloys (Rettig and Virtanen, 2009;Esmaily et al, 2017;Py et al, 2020). In the case of surface treatments, although PEO has demonstrated the ability to mitigate the corrosion to some extent, the corrosion rates of the bulk Mg material remain too high (Benn et al, 2021;Li et al, 2021;Suchý et al, 2021). Additionally, the in vivo study further corroborated the need for further improvements of corrosion properties .…”