Corrosion behavior of AZ31 magnesium alloys coated with PMMA/HA as biodegradable implants

Abstract

Magnesium alloys' rapid corrosion rates have limited their use as biodegradable implants. As a result, designing a composite coating to slow the corrosion of the AZ31 magnesium alloy is critical. A spin coating process was used to cover an AZ31 alloy with a polymethylmethacrylate (PMMA)/hydroxyapatite (HA) composite coating. The coating characteristics was estimated using AFM, FESEM contact angle, and antibiofilm formation. In addition, potentiodaynamic polarisation and hydrogen evolution measurements were used to assess the coating's corrosion resistance and degradation behavior. In general, corrosion experiments revealed that specimens coated with one or two layers of PMMA polymer were successful in slowing down the rate of corrosion in Ringer's solution. Adding hydroxyapatite particles to the PMMA polymer also considerably reduces the rate of corrosion. Furthermore, the corrosion resistance of the coating with two layers of coatings is greatly improved.