Self-Assembled Monolayers of Various Alkyl-Phosphonic Acids on Bioactive FHA Coating for Improving Surface Stability and Corrosion Resistance of Biodegradable AZ91D Mg Alloy
Chung-Wei Yang, Peng-Hsiu Li
TL;DR
This study improves the corrosion resistance of a biodegradable magnesium alloy by applying bioactive coatings and self-assembled monolayers.
Contribution
A novel approach using SAMs on FHA coatings is introduced to enhance surface stability and corrosion resistance in biodegradable alloys.
Findings
FHA coatings uniformly deposited on AZ91D alloy improve anti-corrosion performance.
SAMs of phosphonic acids bonded to FHA surfaces increase hydrophobicity and reduce corrosion.
Dodecylphosphonic acid SAMs show the best corrosion resistance and weight loss reduction.
Abstract
The aim of present study is to deposit protective coatings with various surface chemical states on AZ91D Mg alloy. Hydrothermal bioactive ceramic coatings are performed with a surface modification by the chemical bonding of self-assembled monolayers (SAM). The electrochemical corrosion behaviors of various surface-coated AZ91D alloy within DMEM cell culture medium related to their surface chemical states are evaluated through microstructure observations, XPS surface chemical bonding analysis, static contact angles measurements, potentiodynamic polarization curves, and immersion tests. XRD and high resolution XPS of F 1s analysis results show that the hydrothermal FHA coating with a phase composition of Ca10(PO4)6(OH)F can be effectively and uniformly deposited on the AZ91D alloy. FHA-coated AZ91D displays better anti-corrosion performances and lower degradation rates than those of…
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Taxonomy
TopicsMagnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · MXene and MAX Phase Materials