Study on the effect of magnetic needle grinding on the surface integrity and service performance of medical Mg-0.8Ca alloy

Abstract

Abstract Medical magnesium alloys as biodegradable medical materials are regarded as the third generation of biomedical materials with good biocompatibility and degradability. Still, their application is greatly limited due to their excessive corrosion rate and low mechanical strength. This paper investigates the effect of surface integrity, wettability, and corrosion resistance of Mg-0.8Ca alloy milled surfaces and further magnetic needle magnetic grinding treated surfaces. The test results show that the surface roughness increases after grinding due to the change in surface morphology and work hardening. Still, microhardness, residual compressive stress, wettability, and corrosion resistance are all improved, and the surface is more conducive to cell adhesion and growth. Comparative tests have shown that magnetic pin grinding can effectively enhance magnesium alloy’s application strength and serviceability.