Musculoskeletal trauma and injuries affects hundreds of millions of people around the world, having an enormous socioeconomic impact . Considering the importance of dealing with this fact, several strategies have been established. One of the most recent approaches envisages the development of a new generation of metallic bio-implants, the temporary metallic scaffolds, which can adapt to the human body, while showing biodegradable activity  and . This new class of materials that include pure magnesium (Mg) and magnesium alloys, is expected to have a tremendous impact on human health quality and in economy, since no second surgery to remove or replace the implant is required  and . Mg-based temporary implants are characterized by various properties, such as biodegradability, biocompatibility, and bioresorbability, and elastic properties similar to that of human bone. However, to succeed, bioresorbable Mg-based implants must overcome several drawbacks such as early loss of early mechanical integrity and excessive hydrogen AC 55541 due to its high corrosion susceptibility ,  and . To address these concerns, two different approaches have been followed. On the one hand, new Mg alloys have been designed, including Zn and Ca as main alloying elements , ,  and . On the other hand, various coatings have been proposed  and  with attractive options being based on calcium phosphate (Ca-P). Due to its high biocompatibility and osteoconduction new bone growth and osteointegration is promoted around the implant , , ,  and . Electrodeposition has been widely explored as a route to prepare Ca-P coatings due to simple and low cost equipment, high deposition rate, flexibility, and easy control of the wished surface properties. However most of the Ca-P coatings aster have been reported in literature are too thick (10–120 μm), and easily develop cracks and low mechanical performance ,  and . To reduce the coating thickness and to increase the bioactivity as well as osteointegration, electrophoretic deposition (EDP) of hydroxyapatite nanoparticles (HapNP) on Ti implants was reported as a possible processing route . To date, at our best knowledge no scientific studies report the electrophoretic deposition of hydroxyapatite nanoparticles on ultra-pure magnesium for biomedical applications.