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The use of bioabsorbable metals as temporary medical implants has attracted considerable research interest as they do not require a second surgical operation for removal after the healing process is completed. However, magnesium (Mg) and its alloys have a degradation rate that is too high in biological environments. Therefore, it must be controlled using various strategies. In this study, an AZ31-Mg-based alloy coated with CeO2 is investigated to analyse the effect of the coating on its corrosion protection and biocompatibility. The AZ31 alloy is anodised with NaOH solution, before coating to stabilise the alloy surface. The CeO2 coating is deposited on anodised AZ31 by chemical conversion treatment. The electrochemical properties of samples are evaluated using electrochemical impedance spectroscopy and cyclic polarisation curves using Hank’s solution. Structural and morphological characterisation of the samples are performed using X-ray diffraction and scanning electron microscopy–energy dispersive X-ray spectroscopy. Additionally, biocompatibility is determined by live/dead assay using MC3T3-E1 pre-osteoblasts. The preliminary results indicate that CeO2 coatings exhibit higher electrochemical properties. Additionally, an increase in the ratio of live/dead cells of the AZ31OH-CeO2 surface is detected, in contrast with AZ31, thus indicating improvement in biocompatibility upon CeO2 coating.

The environmental crisis that has been lived in the last decades has generated a great interest for science to search new materials as ecological alternatives for different applications, and corrosion hasn’t been the exception, whence, there have been studied and developed organic compounds to work as corrosion inhibitors to several substrates and environments. Due to this, in this research is proposed the use of phenylalanine (Phe) to protect AISI 1018 steel in sweet brine as a biodegradable and ecofriendly option. Results in continuous immersion during 24 h with concentrations of 0, 10, 100 and 250 ppm show an inhibitor effect since the moment of contact. Nevertheless, it falls before 24 h and the failure is associated to the molecules agglomeration.

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