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Corrosion resistance of cerium conversion film electrodeposited on mg-gd-y-zr magnesium alloy

Journal of Central South University 2009年第1期16卷 38-42页

作者：易建龙张新明陈明安古瑞邓运来 School of Materials Science and Engineering Central South University

The cerium conversion film was applied to improving the corrosion resistance of mg-gd-y-zr magnesium alloy. The film was electrodeposited on the surface of the mg-RE alloy in cerium nitrate solution. The compositions and morphologies were analyzed by X-ray diffraction(XRD), scanning election microscopy (SEM). The corrosion behaviors of the film were investigated electrochemical impedance spectroscopy (EIS), potentiodynamic polarization tests and immersion tests. The results show that the optimum parameters for electrochemical deposition are as follows: pH 10.0, time 30 min, 50 mmol/L Na2CO3 and temperature 25 ℃ by the designed experiments according to the orthogonal table L(9, 34). The corrosion protection efficiency is dependent on the deposition parameters. The cerium conversion film shows better corrosion protection behavior than chromate conversion film on mg-gd-y-zr magnesium alloy.

关键词： mg-gd-y-zr magnesium alloy conversion film corrosion

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Microstructure and mechanical properties of mg-gd-y-zr alloy processed by equal channel angular pressing

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Transactions of Nonferrous Metals Society of China 2011年第10期21卷 2140-2146页

作者：张帆张可翔谭成文于晓东马红磊王富耻才鸿年北京理工大学材料科学与工程学院北京100081 中国航天员科研训练中心先进材料行为特性实验室北京100081

Microstructure evolution and texture development and their effects on mechanical properties of a mg-gd-y-zr alloy during equal channel angular pressing（ECAP） were *** is found that the microstructure is still inhomogeneous after four passes,and two zones,namely the fine grain zone（FGZ） and the coarse grain zone（CGZ） are *** grain refinement occurs mainly by particle-stimulated nucleation（PSN） mechanism,which led to a more random texture after four passes of *** the ECAP-processed alloy,the strength did not increase while the ductility was enhanced dramatically compared with the as-received *** change of ductility of this alloy was discussed in terms of texture and second phase particles.

关键词： mg-gd-y-zr magnesium alloy equal channel angular pressing(ECAP) grain size texture second phase particles mechanical properties

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Enhanced strength and ductility of mg-gd-y-zr alloys by secondary extrusion

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Journal of magnesium and alloys 2013年第1期1卷 54-63页

作者： X.Li W.Qi K.Zheng N.Zhou Guangzhou Research Institute of Non-ferrous Metals Guangzhou 510651China

The mg-12gd-3y-0.6zr(GW123,wt.%)alloy was prepared by cast,and thermo-mechanically treated by single and secondary hot extrusion *** microstructure,texture and mechanical properties of the extruded alloy were *** results show that in different treated conditions the microstructure is mainly composed ofα-mg solid solution and second phases of mg_(3)y_(3)gd_(2) and mg_(5)(gdy)*** best mechanical properties are achieved in the secondary extruded alloy after ageing,with the ultimate tensile strength(UTS),tensile yield strength(TyS)and elongation(ɛ)being 446 MPa,350 MPa and 10.2%at room temperature.A weak texture aligned with〈101¯0〉||ED(extrusion direction)component and spread from〈101¯0〉to〈112¯0〉poles was obtained in secondary extrusion,which is caused by the occurrence of dynamic recrystallization(DRX)in shear bands for texture *** fracture modes in extruded GW123 alloy are mixed pattern of transgranular and intergranular fracture,as well as cleavage *** strengthening mechanisms were quantitatively analysed from the different aspects using the measured microstructural *** grain boundaries and solid solution strengthening were the main contributors to the high tensile strength of the GW123 alloy.

关键词： mg-gd-y-zr magnesium alloy Microstructure Texture Mechanical properties Rare earth Dynamic recrystallization

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