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Design、Preparation and Performance Research of Multi-principal Elements Alloy on Low Corrosion Potential

Author: ChenHanJie
Tutor: GanZhangHua
School: Wuhan University of Science and Technology
Course: Materials Science
Keywords: multicomponent high entropy alloys electrochemical properties intermetalliccompounds sacrificial anode materials
CLC: TG146.21
Type: Master's thesis
Year: 2013
Downloads: 27
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Abstract


AlMgZnSnCuMnNix, AlZnMgCuInxand AlMgZnSnInCuxwere designed according to thecomposition design principles of multicomponent high entropy alloys. Alloy ingots wereprepared by medium-frequency induction furnace and copper-formed mold. Theelectrochemical properties, crystalline structure, microstructure and micro-area composition ofalloys were characterized by electrochemical workstation, X-ray diffraction （XRD） and SEMequipped with EDS.It showed that corrosion potential and corrosion current density change a lot due to theaddition of Ni, and the corrosion potential increased from-1.42V to-1.02V, the corrosioncurrent density decreased from2.41×10-4to1.13×A/cm210-5A/cm2in the study of effect ofNi on electrochemical properties of AlMgZnSnCuMnNix.The microstructure andelectrochemical properties of AlMgZnSnCuMnNixwere improved significantly owing toaddition of Ni. XRD test showed that AlMgZnSnCuMnNix series alloy crystal structure of thecomplex, did not form a simple solid solution structure, but many intermetallic compoundsformation。SEM、EDS show that AL-Ni intermetallic compounds was form with the additionof Ni element.It found that the multicomponent alloy AlMgZnSnCuInxhad low corrosion potential andlow corrosion current density in3.5%NaCl solution in the study of effect of In onelectrochemical properties of AlMgZnSnCuInx.The corrosion potential is between-1.37V and-1.54V, the corrosion current density is between10-5and10-6A/cm2. The results showedaddition of In significantly improved the corrosion resistance of AlMgZnSnCuInx.XRD testshowed that AlMgZnSnCuInx series alloy crystal structure of the complex, did not form asimple solid solution structure, but many intermetallic compounds formation。SEM、EDS showthat In-Sn intermetallic compounds was form with the addition of In element.It found that the multicomponent alloy AlMgZnSnInCuxhad low corrosion potential andlow corrosion current density in3.5%NaCl solution in the study of effect of Cu onelectrochemical properties of AlMgZnSnInCux. The corrosion potential was between-1.43Vand-1.53V. The corrosion potential of AlMgZnSnInCuxshowed little change but the corrosioncurrent density made some increases. Through the XRD, SEM and EDS we can see that Cubrought CuZnAl partial together in the alloys which microstructure then turned nonuniform.Among the three kinds of alloy systems, AlMgZnSnCuInxhad both low corrosion potentialand low corrosion current density, which could be used as good sacrificial anode materials.And AlMgZnSnCuIn0.2had best electrochemical performances, corrosion potential of-1.54V,and corrosion current density of7.4×10-6A/cm2.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Light non-ferrous metals and their alloys > Aluminum
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