Startseite Influence of cryogenic treatment on the corrosion of AZ91 and AM60 magnesium alloys in an isotonic solution
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Influence of cryogenic treatment on the corrosion of AZ91 and AM60 magnesium alloys in an isotonic solution

  • Bassady Gassama und Mustafa Özgür Öteyaka
Veröffentlicht/Copyright: 30. Oktober 2019
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Abstract

Biodegradable stents made of magnesium alloys have become revolutionary in the cardiovascular area. However, rapid corrosion in a body fluid environment is harmful to the mechanical properties and stability. In this study, untreated and cryogenically treated samples of AZ91 and AM60 alloy were employed at −196 °C for 48 h. Afterwards, the corrosion performance of the AZ91 and AM60 samples was tested in an isotonic solution containing 0.9 wt.-% NaCl. Electrochemical methods such as open-circuit potential measurement (OCP), potentiodynamic polarization, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion performance. In general, the results obtained for the electrochemical studies show that the cryogenically treated AZ91 and AM60 samples maintain superior corrosion resistance when compared to the former sample. The OCP results indicated that the cryogenically treated AZ91 and AM60 outperformed untreated samples after 1 h. The potentiodynamic studies confirmed that cryogenically treated AZ91 and AM60 had superior anodic pitting potential (Epit) and that the passivation zone is higher than AZ91 and AM60 when untreated. The EIS confirmed the lower corrosion kinetics for AZ91 and AM60 treated in the former sample.


*Correspondence Address, Assoc. Prof. Dr. Öteyaka, Department of Electronics and Automation, Eskişehir Vocational School, Eskişehir Osmangazi University, Odunpazarı, Eskişehir, Turkey, E-mail:

Dr. Mustafa Özgür Öteyaka, born in 1978, graduated from Ankara Anadolu High School in 1996, and from Eskişehir Osmangazi University with a Bachelor of Science in Materials Science and Engineering in 2000. He obtained his Master's degree in Materials Science and Engineering at Laval University, Quebec, Canada in 2003. After receiving his Master's degree, he worked as a process engineer at the firm of Rio Tinto mining group between the years of 2003−2006. He received his PhD. Degree in Mechanical Engineering at Dumlupınar University, Kütahya, Turkey in 2014. Currently, he is working as an Assistant Professor at the Department of Electronic and Automation at Eskişehir Osmangazi University, Eskişehir, Turkey. His main professional areas are light metals, biomaterials, corrosion, nanofibers and characterization of materials.

Bassady Gassama, born in 1989, obtained his Bachelor's degree in Aeronautical Engineering at the Chinese Air Academy in the Democratic Republic of China (Taiwan) in 2015. After graduating, he returned home to serve as an officer in the National Army in Gambia. He attended a certificate program in Mechatronic at the Science and Technology Center of Excellence in Egypt in 2016. He is currently in the Republic of Turkey where is pursuing a Master's degree in Aviation Science and Technology.


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Published Online: 2019-10-30
Published in Print: 2019-11-04

© 2019, Carl Hanser Verlag, München

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