Characterization of the microstructure and corrosion behavior of electrodeposited FeMn films for bioabsorbable implants applications
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2023
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EUROPEAN CORROSION CONGRESS
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Corrosion of biodegradable implants is not supposed to be avoided, but controlled to
reach a target biodegradation rate [1-4]. Implants made of Fe or its alloys have been
studied for this type of applications; however, they have some drawbacks as low
corrosion rates for this application, accumulation of bulky corrosion products and
ferromagnetic properties, which might be a problem for MRI exams [1-4]. Some
improvements have been proposed in the literature, such as using electrodeposition to
produce thin strut walls of Fe (or alloys) with high purity and using FeMn alloys (with
high concentrations of Mn) that can form an antiferromagnetic phase with higher
corrosion rates than pure Fe [1-6].
In the first part of this work, thin films of FeMn alloys were electrodeposited from sulfate
electrolytes. The effects of additives and electrodeposition current density were
evaluated through electrochemical techniques. The microstructure of the
electrodeposited films was characterized by SEM/EDX and XRD. The surface finishing
and magnetic properties were evaluated by AFM/MFM techniques. The results showed
that FeMn films with a maximum concentration of 18 wt% of Mn were obtained at an
applied cathodic current density of 80 mA/cm2
(close to the limiting current density) for
a 1:5 ratio of Fe2+ and Mn2+ in the electrodeposition bath. These films were mainly
composed of alfa-FeMn phase that still showed magnetic response on MFM analysis.
The use of additives such as buffer, surfactant, and leveling resulted in a more
homogenous film with improved surface finishing. In the second part of this work, the
biodegradation rate of the electrodeposited film will be evaluated through immersion
and electrochemical techniques in simulated body fluids.
Como referenciar
GABBARDO, ALINE D.; FERREIRA, JANE Z.; COSTA, ISOLDA. Characterization of the microstructure and corrosion behavior of electrodeposited FeMn films for bioabsorbable implants applications. In: EUROPEAN CORROSION CONGRESS, August 27-31, 2023, Belgium, Brussels. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47997. Acesso em: 09 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.