Corrosion behaviours of Ti6Al4V-Mg/Mg-Alloy composites

•Ti6Al4V-Mg composites fractured due to rapid generation of hydrogen.•AZ91 containing composites preserved their mechanical integrities.•In addition to Mg(OH)2, Ca-phosphates observed on the corrosion layer.•Composites displayed both bioinert and biodegradable characters. The effect of coupling of u...

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Bibliographic Details
Published in:Corrosion science 2020-04, Vol.166, p.108470, Article 108470
Main Authors: Esen, Ziya, Öcal, Ezgi Bütev, Akkaya, Aslı, Gürçay, Bensu, Özcan, Ceren, Özgümüş, Burcu Aslı, Duygulu, Özgür, Dericioğlu, Arcan F.
Format: Article
Language:English
Subjects:
Alloys
Biomedical materials
Body fluids
Catastrophic failure analysis
Composite materials
Corrosion
Corrosion effects
Corrosion products
Corrosion rate
Degradation
Electrochemical analysis
Galvanic corrosion
Gas evolution
Hydrogen evolution
In vitro methods and tests
Interfaces
Magnesium
Magnesium base alloys
Metal matrix composites
Microcracks
Polarization
SEM
Titanium
Titanium base alloys
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Summary:•Ti6Al4V-Mg composites fractured due to rapid generation of hydrogen.•AZ91 containing composites preserved their mechanical integrities.•In addition to Mg(OH)2, Ca-phosphates observed on the corrosion layer.•Composites displayed both bioinert and biodegradable characters. The effect of coupling of unalloyed Mg and Mg-alloys (AZ91 and WE43) with Ti6Al4V alloy on corrosion and degradation behaviours of produced composites has been investigated in simulated body fluid (SBF) by hydrogen evolution, and surface and electrochemical characterization techniques. Combining of unalloyed Mg with Ti6Al4V intensified galvanic corrosion and catastrophic failure occurred by initiation of microcracks formed by sudden hydrogen gas evolution. In contrast to other composites, Ti6Al4V-AZ91 composites, containing new TiAl3 interface layer formed during composite production, preserved their mechanical integrities due to lowest corrosion and degradation rate of AZ91 alloy.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2020.108470