Biocorrosion and biodegradation behavior of ultralight Mg–4Li–1Ca (LC41) alloy in simulated body fluid for degradable implant applications

Biocorrosion and biodegradation behavior of Mg–4Li–1Ca alloy were investigated for industrially important end product conditions, namely the homogenized, rolled, and rolled + annealed ones. Among the three, homogenized material showed the highest corrosion rate (27.2 mm/year) in a simulated body flu...

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Bibliographic Details
Published in:Journal of materials science 2015-04, Vol.50 (8), p.3041-3050
Main Authors: Nene, S. S., Kashyap, B. P., Prabhu, N., Estrin, Y., Al-Samman, T.
Format: Article
Language:English
Subjects:
Alloys
Annealing
Bacterial corrosion
Biocompatibility
Biodegradation
Biomedical materials
Body fluids
Calcium phosphates
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Corrosion and anti-corrosives
Corrosion mechanisms
Corrosion rate
Corrosion resistance
Crystallography and Scattering Methods
Grain structure
Hydroxides
Hydroxyapatite
In vitro methods and tests
Lithium hydroxides
Localized corrosion
Magnesium base alloys
Magnesium compounds
Magnesium hydroxide
Materials Science
Original Paper
Polymer Sciences
Solid Mechanics
Specialty metals industry
Surgical implants
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Summary:Biocorrosion and biodegradation behavior of Mg–4Li–1Ca alloy were investigated for industrially important end product conditions, namely the homogenized, rolled, and rolled + annealed ones. Among the three, homogenized material showed the highest corrosion rate (27.2 mm/year) in a simulated body fluid (SBF) owing to its coarse grain structure containing long dumbbell-shaped eutectic phase. Rolled + annealed material exhibited the lowest corrosion rate (0.94 mm/year) corresponding to the highest corrosion resistance (1.854 kΩ cm 2 ) in SBF. This higher corrosion resistance is associated with a uniform distribution of corrosion sites and a lower occurrence of twins in the microstructure. However, the rolled material showed a greater corrosion rate due to an appreciable volume fraction of {10 1 ¯ 1} compression twins, {10 1 ¯ 2} tension twins, and {10 1 ¯ 1}–{10 1 ¯ 2} double twins, which form galvanic couples with the adjacent grains that enhances localized corrosion. A mechanism of biodegradation at the alloy/SBF interface is proposed. It involves the formation of bone-like hydroxyapatite and metastable octa calcium phosphate, along with other degradation products, such as magnesium hydroxide and lithium hydroxide.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-8846-y