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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.


Ma J.,Henan University of Science and Technology | Ma J.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology | Wen J.,Henan University of Science and Technology | Wen J.,Henan Key Laboratory of Non Ferrous Metal Materials Science and Processing Technology | And 2 more authors.
Advanced Materials Research | Year: 2011

The corrosion behavior of Al-5Zn-0.03In and Al-5Zn-0.03Ga alloys in 3.5 % NaCl solution has been examined by electrochemical methods, scanning electron microscopy, X-ray microanalysis, electrochemical impedance spectroscopy. The results demonstrate that the alloys differ in the microstructure, corroded morphology and electrochemical properties. For Al-5Zn-0.03In alloy, the precipitates enriched in Al and Zn initiates pitting. For Al-5Zn-0.03Ga alloy, corrosion occurs more uniformly, the corrosion of the alloy occurred via the formation of a surface Ga-Al amalgam alloy. The EIS of Al-5Zn-0.03In alloy contains a capacitive loop and an inductive loop; the inductive loop can be attributed to the presence of the pitting. The EIS of Al-5Zn-0.03Ga alloy contains only a capacitive loop. © (2011) Trans Tech Publications, Switzerland.


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.


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.


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.


Li Y.-Z.,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 | Zhao S.-L.,Henan University of Science and Technology | And 3 more authors.
Corrosion Science and Protection Technology | Year: 2010

The effect of In content on microstructure and electrochemical performance of Al-Zn-In-Mg-Ti alloy was investigated and its corrosion behavior in a man-made seawater was also examined. The results show that with the decrease of In content, the alloy became much homogenetie and the amount of precipitates and dendtrites crystals decreases, which then lead to enhancement of its electrochemical properties. The current efficiency and the actual capacitance of the Al-5Zn-0.02In-lMg-0.05Ti alloy are up to 86. 3% and 2407. 3A·h/kg,respectively. After corrosion in a man-made seawater for 10 days by a constant current density of 1 mA/cm2, the corrosion products of Al-5Zn-0. 02In-lMg-0. 05Ti alloy s easily flaked away and its surface is homogeneous.


Wen J.-B.,Henan University of Science and Technology | Wen J.-B.,Henan Key Laboratory of Non ferrous Metal Materials Science and Processing Technology | Li Y.-Z.,Henan University of Science and Technology | Zhao S.-L.,Henan University of Science and Technology | And 3 more authors.
Corrosion Science and Protection Technology | Year: 2010

The microstructure of Al-5Zn-0.02In-1Mg-0.05Ti alloys, which were the as cast, and the cast ones followed by heat treatments of solid solution, annealing and solid solution plus aging respectively, were comparatively examined. The open circuit potential, working potential, polarization curves and electrochemical impedance spectroscopy (EIS) of them were measured, and then their EIS was analyzed by the equivalent circuit RL(CRp(QRd)(L1Ra1)(L2Ra2)). The effect of different heat treatments on microstructure and electrochemical performance of Al-Zn-In-Mg-Ti alloy anodes was revealed. The results showed that among the four alloys, the current efficiency and the actual capacitance of the annealed alloy were the highest, which were 83.5% and 2391.03 respectively. That was to say that the amount and size of precipitates of the annealed alloy was moderate, so that the alloy exhibited a quite negative open circuit potential as well as a stable working potential.


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

Influence of Mg and RE elements on microstructure of Al-Zn-Bi alloy anodes was investigated by means of metallographic microscopy, scanning electron microscopy and X-ray energy dispersive analysis. The open circuit potential, working potential and current efficiency of the alloys in artificial seawater were tested by constant current method. Effects of Mg or/and RE alloying elements on electrochemical properties of Al-Zn-Bi alloy anodes in 3.5% NaCl solution were studied by polarization curves and electrochemical impedance spectra. The results show that grain size of the alloys becomes smaller and the composition and distribution of segregation phases are improved, consequently, the current efficiency can be raised by 15.93% and 4.12% through adding Mg and RE in the Al-Zn-Bi alloy respectively. Although the current efficiency of the alloy decreases slightly when Mg and RE are added together, the corrosion current density is reduced and the corrosion of the matrix becomes more homogeneous, which improves performance of the alloy ultimately.


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.

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