In Vitro Corrosion Resistance of a Layer-by-Layer Engineered Hybrid Coating on ZK60 Magnesium Alloy

Mostafizur Rahman, Rajkamal Balu, Naba Kumar Dutta and Namita Roy Choudhury
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Mostafizur Rahman: School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Rajkamal Balu: School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Naba Kumar Dutta: School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Namita Roy Choudhury: School of Engineering, RMIT University, Melbourne, VIC 3000, Australia

Sustainability, 2022, vol. 14, issue 4, 1-16

Abstract: Magnesium alloys are next generation biodegradable implants for clinical applications. However, their medical applications are currently hampered by their rapid corrosion rate in the physiological environment. To overcome such limitations, we have applied a novel layer-by-layer engineering approach of introducing anodization-induced microrough oxidized surface on ZK60 magnesium alloy, followed by surface mineralization with natural calcium apatite (hydroxyapatite, HA), and surface coating with natural protein (silk fibroin, SF); which, effectively reduces corrosion and degradation rate of ZK60 in simulated body fluid. Anodization of ZK60 improved the surface adhesion strength of HA layer; HA layer increased the surface roughness, hydrophilicity and micro-hardness, whereas decreased ionic release; SF layer decreased surface microroughness and hydrophilicity, whereas improved the stability of HA layer. The SF + HA coating on anodized ZK60 effectively decreased the in vitro weight loss (degradation) by almost six times, whereas corrosion rate by more than two orders in magnitude. Such interfacial coatings, with biocompatible SF on the outer surface, could potentially expand the application of ZK60 in the field of biomedical engineering.

Keywords: magnesium alloy; anodization; calcium apatite; silk fibroin; layer-by-layer; hybrid coating; corrosion resistance (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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