title: Influence of shot peening on corrosion properties of biocompatible magnesium alloy AZ31 coated by dicalcium phosphate dihydrate (DCPD).
abstract: Magnesium alloys are promising materials for biomedical applications because of many outstanding properties like biodegradation, bioactivity and their specific density and Young's modulus are closer to bone than the commonly used metallic implant materials. Unfortunately their fatigue properties and low corrosion resistance negatively influenced their application possibilities in the field of biomedicine. These problems could be diminished through appropriate surface treatments. This study evaluates the influence of a surface pre-treatment by shot peening and shot peening+coating on the corrosion properties of magnesium alloy AZ31. The dicalcium phosphate dihydrate coating (DCPD) was electrochemically deposited in a solution containing 0.1M Ca(NO3)2, 0.06M NH4H2PO4 and 10mL/L of H2O2. The effect of shot peening on the surface properties of magnesium alloy was evaluated by microhardness and surface roughness measurements. The influence of the shot peening and dicalcium phosphate dihydrate layer on the electrochemical characteristics of AZ31 magnesium alloy was evaluated by potentiodynamic measurements and electrochemical impedance spectroscopy in 0.9% NaCl solution at a temperature of 22±1°C. The obtained results were analyzed by the Tafel-extrapolation method and equivalent circuit method. The results showed that the application of shot peening process followed by DCPD coating improves the properties of the AZ31 surface from corrosion and mechanical point of view.
authors.affiliation: Institute of Materials Science and Engineering, Clausthal University of Technology, Agricolastrasse 6, 38678 Clausthal-Zellerfeld, Germany; Faculty of Engineering, Zagazig University, Egypt. Electronic address: mansour.mhaede@yahoo.com.
authors.forename: Mansour
authors.initials: M
authors.lastname: Mhaede
authors.affiliation: Department of Materials Engineering, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 1, 010 26 Žilina, Slovak Republic.
authors.forename: Filip
authors.initials: F
authors.lastname: Pastorek
authors.affiliation: Department of Materials Engineering, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 1, 010 26 Žilina, Slovak Republic; Research Centre of the University of Žilina, Univerzitná 1, 010 26 Žilina, Slovak Republic.
authors.forename: Branislav
authors.initials: B
authors.lastname: Hadzima
mesh_terms: D000497:Alloys / Q000737:chemistry; D001673:Biodegradation, Environmental; D002130:Calcium Phosphates / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003343:Corrosion; D058266:Dielectric Spectroscopy; D006861:Hydrogen Peroxide; D008274:Magnesium / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012965:Sodium Chloride / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature
chemical_list: D000497:Alloys; D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D012996:Solutions; D012965:Sodium Chloride; D006861:Hydrogen Peroxide; D008274:Magnesium; C494366:calcium phosphate, dibasic, dihydrate
keywords: Coating; Corrosion; Electrochemical impedance spectroscopy; Mg-alloy; Shot peening