Banca de DEFESA: EMANOEL JONATHAN BARBOSA DE CARVALHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : EMANOEL JONATHAN BARBOSA DE CARVALHO
DATE: 18/11/2022
TIME: 14:00
LOCAL: CTEC - Sala 414
TITLE:

Electrolytic Plasma Oxidation of AISI 316L steel with addition of calcium phosphate

KEY WORDS:

Hydroxyapatite, Electrolytic Oxidation, AISI 316LVM, Biomaterial, Biocompatibility.

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

316L stainless steel has been widely used as a metallic biomaterial for orthopedic and dental implants due to its excellent mechanical properties and low cost. However, one of the main limitations to its clinical use is the susceptibility to localized corrosion in physiological environments that can result in inflammation, pain and, in the worst case, implant failure. To increase its biocompatibility, the metal can be coated with hydroxyapatite which has a chemical composition similar to the inorganic matrix of bone. The objective of this study is to improve the corrosion behavior, biocompatibility of the metallic implant and osseointegration. Stainless steel 316L was used as a metallic substrate for the deposition of the hydroxyapatite coating performed by the electroplating technique called Plasma Electrolytic Oxidation (PEO), which has the advantages of simplicity, low cost and thermal and chemical stability. The samples were immersed in an electrolyte solution containing calcium acetate, beta glycerol phosphate and nitric acid. Then, a potential difference was applied using two configurations: cathodic reaction during times of 90 and 180 seconds and anodic reaction during times of 15 and 20 seconds. The crystalline phase composition of the coating was analyzed by X-ray diffraction (XRD). The topography of the deposited films and their layer thickness were analyzed by Scanning Electron Microscopy (SEM). Furthermore, the corrosion properties of the treated and untreated surfaces were evaluated by potentiodynamic polarization tests using an electrochemical corrosion cell with an electrolyte containing 3% sodium chloride (NaCl) by weight. The results obtained showed that the bioactive hydroxyapatite coatings were successfully deposited on the substrate surface and presented a relevant and uniform thickness, constituted by a stable chemical composition. The increase in polarization resistance indicates that the coatings are electrochemically stable and show better corrosion resistance. In this way, the methodology employed provides a practical and objective way to modify the surface of 316L stainless steel and obtain a better biocompatibility of the metal for medical applications.8 .

COMMITTEE MEMBERS:
Interna - 2614274 - MICHELLE CEQUEIRA FEITOR
Interno - 2550377 - THERCIO HENRIQUE DE CARVALHO COSTA
Externo ao Programa - 2820855 - MAXWELL SANTANA LIBÓRIO - UFRNExterno à Instituição - IVAN ALVES DE SOUZA
Externo à Instituição - ROMULO RIBEIRO MAGALHAES DE SOUSA - UFPI