Abstract

The aim of this research is to improve degradation rates of magnesium alloys AZ31 as biodegradable implant using Plasma Electrolytic Oxidation (PEO) method. Magnesium alloys AZ31 is used as temporary biomaterials due to good mechanical and biocompatibility, however the degradation rate is weekness of the material. In this study, Plasma Electrolytic Oxidation was employed to grow oxide on surface by creating plasma using high voltage electrical source. This study to analyze the influence of sodium silicate concentration and oxidation time on morphology, mechanical property, and degradation rates on magnesium AZ31 alloys during PEO. The variations of sodium silicate concentration are 0.025, 0.035 and 0.045M with oxidation times of 5 to 15 minutes. Based characterisaion using XRD was found that there were two new compounds exist of the surface such as MgO and Mg2SiO4. The results of SEM / EDX on the surface showed that the higher the concentration of sodium silicate and the oxidation time influence the pore diameter size become bigger and increase the thickness. In addition, based on AFM investigation, the surface roughness that was measured by micro vicker method has three times that was compared to untreated sample till peak condition while the concentration up to 0.045M and an increase in oxidation time of up to 15 minutes and then the hardness was decreased. In the rate of degradation evaluation using the weight loss method that the lowest degradation rate is during deposition using 0.025M sodium silicate concentration and 10 minutes oxidation time with a degradation rate of 2,89mm / year.

Original languageEnglish
Title of host publication4th International Conference on Materials and Metallurgical Engineering and Technology, ICOMMET 2020
EditorsMas Irfan Purbawanto Hidayat, Amaliya Rasyida
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735441743
DOIs
Publication statusPublished - 30 Dec 2021
Event4th International Conference on Materials and Metallurgical Engineering and Technology, ICOMMET 2020 - Surabaya, Indonesia
Duration: 19 Oct 2020 → …

Publication series

NameAIP Conference Proceedings
Volume2384
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference4th International Conference on Materials and Metallurgical Engineering and Technology, ICOMMET 2020
Country/TerritoryIndonesia
CitySurabaya
Period19/10/20 → …

Keywords

  • Degradation rate
  • Magnesium alloy
  • Mechanical properties
  • Plasma electrolytic oxidation (PEO)
  • Sodium silicate

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