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Wen J.B.,Henan University of Science and Technology | Ma J.L.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology
Materials Science and Technology (United Kingdom) | Year: 2012

The corrosion process of Al-5Zn-0?02In-1Mg-0?05Ti (wt-%) alloy was investigated by electrochemical noise. The corroded surfaces of the alloy were observed by scanning electron microscopy. The electrochemical noise data obtained from the corrosion process were analysed using shot noise theory. The pitting and uniform corrosions were confirmed by cumulative probability F [F5(fn)] versus the frequency of events fn. The Weibull probability plots show the three corrosion stages for the alloy: pitting, pitting and dissolution-precipitation and uniform corrosion. The physical model for the corrosion process has been developed © 2012 Institute of Materials, Minerals and Mining. Source


Li G.,Henan University of Science and Technology | Wen J.,Henan University of Science and Technology | Wen J.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology | He J.,Henan University of Science and Technology | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

The effects of yttrium with different content on the microstructures and properties of AZ80 alloy were investigated at room temperature by using of scanning electron microscope (SEM), optical microscope (OM), X-ray diffractometer (XRD), tensile tester and corrosion weightlessness method. The results show that proper content of Y can refine the microstructures of AZ80 magnesium alloy obviously, decrease the quantity of β-Mg 17Al 12 phases sharply, chang their morphology from continuous network to discontinuous disperse after the addition of Y, and a new phase Al 2Y formed. The optimal performance was obtained when the Y content in the alloys was 0.5%, the tensile strength and the elongation of the alloy were 199.286 MPa and 6.155%, increased by 7.49% and 7.98% compared with AZ80 alloy respectively, the corrosion rate was 0.2585 mg·cm -2·d -1, only the 48.07% compared with AZ80 alloy. Source


Shao H.-Y.,Henan University of Science and Technology | Wen J.-B.,Henan University of Science and Technology | Wen J.-B.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology | Ma J.-L.,Henan University of Science and Technology | And 2 more authors.
Corrosion and Protection | Year: 2013

The effect of trace Si(0~0.2%) on the microstructure and electrochemical performance of Al-In-Mg-Sn anode alloys used for aluminum-air batteries was studied by scanning electron microscopy, open circuit potentials, polarization curves and electrochemical impedance spectroscopy (EIS). The results show that trace Si can improve the casting character and reduce the cast defects of aluminum alloys. With the increase of Si content, the electrochemical performance of anode alloys increased first and then decreased. The best combination properties could be obtained when 0.1% Si element was added, the lowest corrosion rate(0.105 4 mg · cm-2 · min-1) and the most negative OCP (-1.8 V). The discharge voltage was 1. 72 V at 5 mA constant current discharge. Source


Ma J.,Henan University of Science and Technology | Wen J.,Henan University of Science and Technology | Wen J.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology | Shao H.,Henan University of Science and Technology
Applied Mechanics and Materials | Year: 2012

In order to improve the electrochemical properties of Al-Zn-In alloys, Al-5Zn-0.02In-1Mg-0.05Ti-xMn (x=0, 0.3, 0.5, 0.7, 1.2) (wt %) alloys were develpoed. Electrochemical properties and corrosion behaviour of the alloys were investigated. The results show that the electrochemical properties are obtained in Al-5Zn-0.02In-1Mg-0.05Ti-0.5Mn alloy. The excellent electrochemical properties of the alloy is mainly attributed to uniform corrosion. Corrosion behaviour of the alloys were analysed by corrosion characteristic parameters such as E c, E pit, E prot and E ptp. This analysis result has a good agreement with the alloy corrosion morphology. © (2012) Trans Tech Publications. Source


Hao Q.-G.,Henan University of Science and Technology | Wen J.-B.,Henan University of Science and Technology | Wen J.-B.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology | He J.-G.,Henan University of Science and Technology | Ma J.-L.,Henan University of Science and Technology
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

The open circuit potential, working potential, current efficiency and surface corrosion morphology of Al-Zn-Bi alloy before and after adding Ga element in artificial seawater were tested and observed by constant current method. The corrosion characteristics of the anode alloys in 3. 5% NaCl solution were investigated by polarization curves and electrochemical impedance spectra. The results show that the open circuit potential shifts towards negative, working potential becomes stable, the current efficiency improves and corrosion morphology becomes uniform through the addition of gallium in the alloy. Gallium can be uniformly dissolved into aluminum alloy and the cations can deposit back to the anode surface forming into the Ga-Al amalgam. The activation control step of anode alloy transforms from the preferential dissolution-shed mechanism of second phase particles to the dissolution-redeposition mechanism of metal cations, which promotes its homogeneous dissolution and improve comprehensive electrochemical performance. Through analysis, the different activation mechanism can be characterized by the equivalent circuits of R L(C, (C pR p) (Q LR dl) (LR a) and R L(C a(C pR p) (Q 1R d1) (R a.) (Q 2R d2)) fitted the EIS in 3.5% NaCl solution of those two alloys. Source

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