Effect of Zn Content on Orthopedic Mg aAlloy as Smart Implant

Omyma Ramadan Mohammed Khalifa,Abdel-Wahab Abd Elhamid Ali,Amal Hemida Tilp,Aisha Kassab,Marwa Mohamed Mohamed Mohamed Esmail

doi:10.37358/rc.20.6.8175

Abstract

In recent years, smart implants take the most attention in the field of bone manufacturing. Our study seeks to develop the biodegradability of Mg alloys to use orthopedic implants for the biomedical applications to avoid post removal of the implant. Mg and Zn are very important to human body and have no toxicity. Mg - 6% wt Zn biodegradability is studied in simulated body fluid for two and four weeks. Four electro-deposition bathes are used to deposit a coat on the substrate to improve the corrosion resistance of this alloy in the media of simulated body fluid. The following analyses were studied to emphasize the research aim. Scanning electron microscope (SEM), Energy dispersive X-Ray (EDX) analysis shows the surface morphology and the elements of the coat phases components. The results also confirmed by X-Ray diffraction Pattern (XRD) that show the phases that confirmed the formation of hydroxyapatite HA phase, Fourier-Transform Infrared Spectroscopy (FTIR) to investigate the functional groups of the phases coats that confirm the formation of hydroxyapatite and the electrochemical measurements that investigate the improvement of corrosion resistance. The results indicated that the fourth bath gives the best coat and four weeks immersion gives more corrosion resistance than two weeks.

Highlights

Smart implants or biodegradable implants development in simulated body fluid is the powerful aim to attract the interest of scientists in the few recent years.[1, 2]
Element alloying with magnesium is a good bath to enhance its corrosion resistance and the mechanical proprieties. [2, 4] Magnesium implants have been enhanced to simulate the formation of new bone when used as bone fixtures [6]
Fourier-Transform Infrared Spectroscopy (FTIR) analysis show the present of hydroxyl, nitrate, phosphate, hydrogen phosphate groups

Summary

Introduction

Smart implants or biodegradable implants development in simulated body fluid is the powerful aim to attract the interest of scientists in the few recent years.[1, 2]. Element alloying with magnesium is a good bath to enhance its corrosion resistance and the mechanical proprieties. [2, 4] Magnesium implants have been enhanced to simulate the formation of new bone when used as bone fixtures [6]. Zinc is essential element in the human body and used to rise the corrosion potential and decrease corrosion rate of Mg. Some recent studies discussed the improvement of the Mg-Zn binary alloys. Shuhua Cai [2] study the Mg-Zn binary alloy (Zn= 1, 5 and 7%) and enhanced the corrosion resistance of the alloy. Mg-1%Zn studied and enhanced it's mechanical prosperities and corrosion resistance by the addition of Zn as alloying element. [15, 16] Mg-3%Zn alloy was studied by different heat treatment to enhance corrosion resistance. Hydroxyapatite have similar chemical composition to the bone tissue. [20-23]

Methods

Results

Conclusion