Corrosion Behavior of Zn, Fe and Fe-Zn Powder Materials Prepared via Uniaxial Compression.

Radka Gorejová,Pavol Cipa,Renáta Oriňaková,Andrej Oriňak,Róbert Džunda,Ivana Šišoláková,Tibor Sopčák

doi:10.3390/ma14174983

Radka Gorejová, Pavol Cipa + Show 5 more

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https://doi.org/10.3390/ma14174983

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Abstract

Powder metallurgy is one of the most prevalent ways for metallic degradable materials preparation. Knowledge of the properties of initial powders used during this procedure is therefore of great importance. Two different metals, iron and zinc, were selected and studied in this paper due to their promising properties in the field of biodegradable implants. Raw powders were studied using scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (EDX). Powders (Fe, Zn and Fe-Zn in a weight ratio of 1:1) were then compressed at the pressure of 545 MPa to the form of pellets with a diameter of 1.7 cm. Surface morphology and degradation behavior in the Hanks´ solution were studied and evaluated. Electrochemical polarization tests along with the static immersion tests carried out for 21 days were employed for corrosion behavior characterization. The highest corrosion rate was observed for pure Zn powder followed by the Fe-Zn and Fe, respectively. A mixed Fe-Zn sample showed similar properties as pure zinc with no signs of iron degradation after 21 days due to the effect of galvanic protection secured by the zinc acting as a sacrificial anode.

Highlights

This study aims to prepare and characterize the material consisting of Fe-Zn with an optimal corrosion rate for biodegradable implants preparation and to understand the degradation process ongoing on the surface of the mixed Fe-Zn compressed sample
Metallic powders were compressed using a hydraulic press, and their degradation properties in simulated body fluids represented by Hankssolution were studied
A 21-day-long immersion test was carried out to characterize corrosion deposits created on the metallic sample surfaces, and electrochemical methods have been chosen for corrosion rate evaluation

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Biomaterials can be described as widely used materials in current medical practice for the treatment and replacement of those tissues and organs that have been damaged or undergone degeneration [1,2]. The use of biomaterial has affected humans for thousands of years. Even though the first biomaterials used in the field of medical therapeutics date back to over 32,000 years, most of the biomaterial applications have occurred over the past 2000 years [3]. A wide range of biomaterials is used for disease and injuries treatment. The most commonly used biomaterials devices in medicine are various types of implants such as dental implants, vascular stents, synthetic heart valves, and medical devices such as biosensors, cardio stimulators, etc. The most commonly used biomaterials devices in medicine are various types of implants such as dental implants, vascular stents, synthetic heart valves, and medical devices such as biosensors, cardio stimulators, etc. [4,5]

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