Executive Summary : | Magnesium is a biodegradable material in the human body and the product formed (Mg2+) by its degradation, is harmless for the human body and also enhances the metabolism. Therefore, magnesium shows excellent potential as an implant material for clinical applications. Unfortunately, magnesium alloys also display some undesirable properties including poor corrosion resistance and wear resistance [1]. Therefore, magnesium cannot be used in medical applications unless it is coated with a material that can reduce its resistant to corrosion and avoids the risk of bacterial infection. Further, it has been reported that there are strong possibilities of improving wear and corrosion by applying coating of high entropy alloys (HEA) [2]. The HEAs exhibits some remarkable characteristics, for example, corrosion resistance, wear resistance, and excellent mechanical properties. However, the coating hinders the direct contact between the metal and the corrosion causing products, this process of forming passive protective layer is insensitive to changes in the external medium. For example, the presence of microcracks /micropores in coating can aggravate corrosion [1]. To avoid these defects, addition of graphene as a dielectric during electrical discharge coating (EDC) is one of available method as reviewed in the literature [3]. EDC is one of the most simple and economical method, for coating/localized deposition of wide range of similar and dissimilar material with different melting points in one go [4–6]. But no work has been reported on micro-EDC of HEA’s on magnesium substrate for its implant applications. EDC uses powder metallurgy tool/green compact tool of materials that need to be coated with desirable thickness [7,8]. Commercially used surface coating process needs sophisticated set-ups need, high maintenance cost, and skilled labour. Researchers have developed a simple EDC process for various complex shaped industrial components, such as, repairing of turbine blades [9]. The novelty of present research work lies in the fabrication of coating on micro-components and application of HEA powders in this process for its biomedical applications. In addition, the use of deionized water in EDC process can help to overcome the environmental pollution. The present research work focuses on deposition of coating with the help of green compact tool electrode of HEA powders to improve the corrosion and wear of magnesium alloys. For getting green compact, HEA powders will be compacted and pressed in hot mounting press. The micron size tools can be fabricated by cutting the prepared green compact and fabricated tool can utilized for deposition of coating via micro-EDM set up. Finally, the samples prepared with EDC will be characterized for mechanical, tribological, corrosion, biocompatibility, and morphological properties. |