RT Journal Article
T1 Plasma electrolytic oxidation of AZ31 magnesium stents for degradation rate control
A1 Muñoz, Marta
A1 Fernández, Juan Pablo
A1 Torres, Belén
A1 Pulido, Nuria
A1 Zhang, Guangqi
A1 Shanov, Vesselin
A1 Moreno, Lara
A1 Matykina, Endzhe
AB Cardiovascular disease caused by the accumulation of atheroma plaques in the coronary arteries and the subsequent decrease in the blood flow through the affected vessel, known as atherosclerosis, is responsible for a high percentage of deaths worldwide. Angioplasty is practiced to treat atherosclerosis which involves inserting a stent inside the occluded vessel to expand it and restore normal blood flow. In this work, temporary biodegradable stents made of AZ31 magnesium alloy have been fabricated using photo-chemical etching. The stents were coated via plasma electrolytic oxidation (PEO) technique. The radial strength of the stents was evaluated by cyclic compression, and the corrosion protection provided by the PEO coatings was studied by electrochemical and in vitro corrosion tests respectively. The stents showed an optimal maximum radial force of 0.147 N/mm and revealed elastic recuperation lower than 7 % of the total deformation after expansion. The applied PEO coating helped to control the corrosion of the magnesium alloy, delaying its initiation and, once it has started, decreased the degradation rate compared with the bare AZ31 samples. Thus, the stents treated with the PEO coatings developed in this research present promising results for their use as temporary medical devices used in angioplasty.
PB Elsevier
YR 2024
FD 2024-02-08
LK https://hdl.handle.net/20.500.14352/118082
UL https://hdl.handle.net/20.500.14352/118082
LA eng
NO Marta Muñoz, Juan Pablo Fernández, Belén Torres, Nuria Pulido, Guangqi Zhang, Vesselin Shanov, Lara Moreno, Endzhe Matykina, Joaquín Rams, Plasma electrolytic oxidation of AZ31 magnesium stents for degradation rate control, Surface and Coatings Technology, Volume 479, 2024, 130539, ISSN 0257-8972, https://doi.org/10.1016/j.surfcoat.2024.130539.
NO Agencia Estatal de Investigación
NO Ministerio de Ciencia, Innovación y Universidades
NO Comunidad de madrid
NO NSF
DS Docta Complutense
RD 21 abr 2025