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MICROSTRUCTURE OF DIRECTLY EXTRUDED Mg-1Zn-1Ca ALLOY AND ITS CORROSION BEHAVIOR IN SBF SOLUTION |
Zhongming ZHANG1,2(),Kai YU1,Weiwei REN1,Ying MA1,Chunjie XU1,Zengzhe XI2 |
1 Key Laboratory of Electrical Materials and Infiltration Technology of Shaanxi Province, School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048 2 Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710032 |
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Cite this article:
Zhongming ZHANG,Kai YU,Weiwei REN,Ying MA,Chunjie XU,Zengzhe XI. MICROSTRUCTURE OF DIRECTLY EXTRUDED Mg-1Zn-1Ca ALLOY AND ITS CORROSION BEHAVIOR IN SBF SOLUTION. Acta Metall Sin, 2015, 51(8): 985-992.
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Abstract The as-extruded Mg-1Zn-1Ca (mass fraction, %) alloys was fabricated successively by alloying, homogenization treatment and hot extrusion. The corrosion behavior of the alloy in simulated body fluid (SBF) solution was evaluated by electrochemical test and immersion test. The microstructure and morphology of corrosion product were observed by OM and SEM. Compositions of corrosion layer and different phases were investigated by EDS analysis. Fourier Transform infrared spectroscopy was also conducted to identify the functional groups in the corrosion products and XRD was also used to determine the phase constitutes of the corrosion products. The results show that Mg-1Zn-1Ca alloy consists of three phases, i.e. a-Mg, Mg2Ca and Ca2Mg6Zn3. After immersion in SBF solution for 72 h, the corrosion products is composed of HA (Ca10(OH)2(PO4)6), CaCO3, MgCl2 and Mg(OH)2. During the stage of immersion, the high active Mg2Ca phases act as the anode and corrode first, so they protect the around a-Mg substrate; the Ca2Mg6Zn3 phases are the lowest active, so they accelerate the corrosion of around α-Mg substrate. The corrosion resistance of as-cast Mg-1Zn-1Ca alloy are better than as-extruded alloy.
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Fund: Supported by Shaanxi Provincial Science and Technology Plan Project (No.2010K10-08), Scientific Research Project of Education Department of Shaanxi Province (No.2013JK0906) and Research Project of Key Laboratory of Electrical Materials and Infiltration Technology of Shaanxi Province (No.ZSKJ201302) |
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