Degradation characteristics of mg-1,6gd alloy at low thickness reduction of warm rolling

Ahmad Nabil Faiz Hidayat, Ahmad Zakiyuddin, Sri Harjanto, Oknovia Susanti

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Magnesium has been developed as a biodegradable bone implant material due to its similarity in elasticity modulus of bone. However, magnesium has a higher corrosion rate and a lower strength. Gadolinium is alloyed to magnesium in order to improve the corrosion resistance and then rolled to improve the strength due to grain refinement in rolling. Cold roll produced the finest grain, but magnesium has a poor formability. Due to this fact, warm rolling with temperature 247 – 375 oC is applied. Optical Microscope, Scanning Electron Microscope (SEM), and Energy Dispersive Spectrometry (EDS) are used for characterization. Electrochemical Impedance Spectroscopy (EIS) and Polarization test were carried out to observe the corrosion mechanism of Mg-Gd in SBF Kokubo to replicate a human body condition. The result of polarization test shows that the cross-rolled sample experienced an increase in E corr, with 0,15 and –0,048 V due to a better distribution of Gadolinium. EIS states that the single pass rolled sample has a stronger passive layer with 116 and 126 kΩ value of Rf due to a smaller grain size which resulted a fewer compression stress. The hydrogen evolution was also observed with immersion test.

Original languageEnglish
Title of host publicationAdvanced Materials Research QiR 16
EditorsAnne Zulfia, Wahyuaji Narottama Putra
PublisherTrans Tech Publications Ltd
Pages139-147
Number of pages9
ISBN (Print)9783035715996
DOIs
Publication statusPublished - 2020
Event16th International Conference on Quality in Research, QiR 2019 - Padang, Indonesia
Duration: 22 Jul 201924 Jul 2019

Publication series

NameMaterials Science Forum
Volume1000 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference16th International Conference on Quality in Research, QiR 2019
CountryIndonesia
CityPadang
Period22/07/1924/07/19

Keywords

  • Corrosion
  • Cross-directional rolling
  • Hydrogen evolution
  • Simulated body fluid
  • Uni-directional rolling

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