Mhaede Mansour, Pastorek Filip, Hadzima Branislav
Institute of Materials Science and Engineering, Clausthal University of Technology, Agricolastrasse 6, 38678 Clausthal-Zellerfeld, Germany; Faculty of Engineering, Zagazig University, Egypt.
Department of Materials Engineering, Faculty of Mechanical Engineering, University of Žilina, Univerzitná 1, 010 26 Žilina, Slovak Republic.
Mater Sci Eng C Mater Biol Appl. 2014 Jun 1;39:330-5. doi: 10.1016/j.msec.2014.03.023. Epub 2014 Mar 15.
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.
镁合金因其诸多优异性能，如生物可降解性、生物活性，且其特定密度和杨氏模量比常用的金属植入材料更接近骨骼，而成为生物医学应用的有前景材料。不幸的是，它们的疲劳性能和低耐腐蚀性对其在生物医学领域的应用可能性产生了负面影响。通过适当的表面处理可以减少这些问题。本研究评估了喷丸处理和喷丸处理+涂层的表面预处理对镁合金AZ31腐蚀性能的影响。在含有0.1M Ca(NO3)2、0.06M NH4H2PO4和10mL/L H2O2的溶液中通过电化学沉积二水磷酸二钙涂层（DCPD）。通过显微硬度和表面粗糙度测量评估喷丸处理对镁合金表面性能的影响。在22±1°C的温度下，在0.9% NaCl溶液中通过动电位测量和电化学阻抗谱评估喷丸处理和二水磷酸二钙层对AZ31镁合金电化学特性的影响。通过塔菲尔外推法和等效电路法对所得结果进行分析。结果表明，先进行喷丸处理再进行DCPD涂层处理，从腐蚀和力学角度改善了AZ31表面的性能。
