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

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 coat-ing 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 measure-ments were used to assess the coating's corrosion resistance and degradation behavior. In general, corro-sion 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 resis-tance of the coating with two layers of coatings is greatly improved.Copyright (c) 2022 Elsevier Ltd. All rights reserved.Selection and peer-review under responsibility of the scientific committee of the International Confer-ence on Recent Advances in Mechanical Engineering and Nanomaterials

Automated summary

The rapid corrosion rates of magnesium alloys limit their use as biodegradable implants. An AZ31 magnesium alloy was coated with a polymethylmethacrylate (PMMA)/hydroxyapatite (HA) composite coating using a spin coating process. The coating characteristics and corrosion resistance were evaluated, and it was found that adding hydroxyapatite particles to the PMMA polymer significantly reduces the corrosion rate.