Electrochemical study of Forsterite / Tricalcium phosphate ceramic coatings generated by plasma electrolyte oxidation method on AZ31B alloy

Electrochemical study of Forsterite / Tricalcium phosphate ceramic coatings generated by plasma electrolyte oxidation method on AZ31B alloy


Electrochemical study of Forsterite / Tricalcium phosphate ceramic coatings generated by plasma electrolyte oxidation method on AZ31B alloy

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Electrochemical study of Forsterite / Tricalcium phosphate ceramic coatings generated by plasma electrolyte oxidation method on AZ31B alloy

ارائه دهنده: Provider: Amir Hossein Kazemi

اساتید راهنما: Supervisors: Arash Fattah-alhosseini (Ph.D)

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Mohsen Keshavarz Khorasgani (Ph.D) - Hooman Savoji (Ph.D)

زمان و تاریخ ارائه: Time and date of presentation: November, 20, 2020

مکان ارائه: Place of presentation:

چکیده: Abstract: In this study, the electrochemical behavior of AZ31B magnesium alloy, which was coated with plasma electrolytic oxidation method with Forsterite / tricalcium-phosphate ceramic powders, at constant voltage (650 volts) and constant current density (1 mA/cm). Along with various analyzes and electrochemical impedance spectroscopy, EIS was successfully performed in body simulation solution. The aim of this study was to investigate the behavior of these coatings and the effect of their concentration on the electrochemical nature of this alloy, biodegradability and contribution to the development of bone and orthopedic implants. the coating process in two series was performed under the same conditions by changing the concentration of additives so that in each series one of the salts had a constant concentration and the other salt was variable. XRD analyzes in the grazing module and FESEM scanning electron microscope well showed the formation of these dense ceramic layers with uniform and same porosity on this metal substrate. Electrochemical impedance spectroscopy (EIS) test showed the highest corrosion resistance in samples of 4 g/l tricalcium-phosphate and 3 g/l of forsterite in basic phosphate electrolytes with a concentration of 5 g/l of sodium phosphate and 3 g/l of potassium hydroxide in a liter of distilled water was immersed in body simulator solution (SBF) for 7 days. Dynamic potential polarization curves indicate the corrosion-resistant behavior of high concentrations of tricalcium phosphate. In this study, forsterite / tricalcium-phosphate coatings increased the corrosion resistance of magnesium substrate by about 10 times. The coating obtained from these electrolytes is dense and relatively uniform, for example 4 g/l of pores tricalcium phosphate with average size (4.21 μm) and for forsterite salt coatings, 3 g/l with pores of average size (7.38 μm) was recorded and the thickness of the coatings increased with increasing salt concentration. Finally, these additives can be introduced as useful surface modifiers for this substrate, which can be useful in bone tissue engineering to help improve the quality of life of patients. Key Words: AZ31B, PEO, SBF, EIS, PDP, forsterite, tricalcium-phosphate, tissue engineering, biodegradable

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