Corrosion Studies of Gadolinium Based Anodic Coating on AZ91D Magnesium Alloy for Biomedical Implant

Magnesium alloys with their biodegradable characteristics can be a very good candidate to be used in biomedical implants. AZ91D magnesium alloy had been chosen for investigating the effect of gadolinium concentration on corrosion performance. AZ91D magnesium alloy was immersed in La (NO3)3, Mg (NO3)2, and Gd (NO3)3 in simulated body fluid (SBF) solution. The structure and formation mechanism of the coating are discussed in detail through surface morphology, corrosion rate and electrochemical test. The effects of gadolinium in different concentration on the corrosion performance of magnesium substrate are investigated.