Evaluating the Performance of Aluminum Sacrificial Anodes with Different Concentration of Gallium in Artificial Sea Water

In this manuscript, the influence of gallium content additions of Al-Zn-In-Mg alloy was investigated through electrochemical techniques and microstructure observation in 3.5 wt% NaCl solution. The results indicated that Al-Zn-In-Mg-0.03Ga alloy has the best discharge performance among all alloys. We propose that this is due to the fact that gallium addition to the Al-4Zn-In-Mg alloy improves the discharge activity of the alloy as well as elevating its anodic efficiency. In particular, the effect of gallium addition to improve discharge activity tends to be a parabolic curve, in which there is an increase when the gallium is first added that rises to the maximum anode current efficiency of about 98.25% whenever gallium content is 0.03 wt%.

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Activation of an Al-Zn-Mg-Li alloy by the Presence of Precipitates to be used as Sacrificial Anode

MRS Proceedings ◽

10.1557/proc-654-aa3.5.1 ◽

2000 ◽

Vol 654 ◽

Cited By ~ 1

Author(s):

S. Valdez ◽

M. A. Talavera ◽

J. Genesca ◽

J. A. Juarez-Islas

Keyword(s):

Electron Microscope ◽

Uniform Distribution ◽

Room Temperature ◽

Sea Water ◽

Al Alloys ◽

Sacrificial Anode ◽

Nacl Solution ◽

X Ray ◽

Sacrificial Anodes ◽

Scanning Electron

AbstractThis work reports the influence of microstructure on the electrochemical efficiency of Al- alloys to be used as sacrificial anodes. The microstructure of as-cast Al-ingots was characterized by X-ray diffractometry and scanning electron microscope (equipped with WDS microanalysis facilities). The electrochemical behavior was investigated in 3% NaCl solution simulating sea water at room temperature. Regarding microstructure, X-ray diffractometry detected the presence of the α-Al phase, and the τ-Al2Mg3Zn3, Mg7Zn3 and δ-AlLi precipitates. SEM observations confirmed the presence of α-Al dendrites with τ-Al2Mg3Zn3 and Mg7Zn3 particles in matrix. In interdendritic regions, it was observed the presence of the eutectic α-Al + τ-Al2Mg3Zn3 plus some primary Mg7Zn3 particles. δ-AlLi particles were identified at this step only by X-ray diffractometry. Finally, it was detected that an uniform distribution of precipitates in the α-Al dendrites together with an uniform distribution of a fine eutectic gave as a result in as-cast ingots an electrochemical efficiency up to 61.4 %.

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Electrochemical discharge performance of the Mg–Al–Pb–Ce–Y alloy as the anode for Mg–air batteries

Journal of Materials Chemistry A ◽

10.1039/c6ta02574a ◽

2016 ◽

Vol 4 (22) ◽

pp. 8658-8668 ◽

Cited By ~ 57

Author(s):

Yan Feng ◽

Wenhui Xiong ◽

Junchang Zhang ◽

Richu Wang ◽

Naiguang Wang

Keyword(s):

Electrochemical Techniques ◽

Pure Magnesium ◽

Nacl Solution ◽

Discharge Performance ◽

Electrochemical Discharge ◽

Magnesium Az31

The electrochemical discharge performance of the Mg–Al–Pb–Ce–Y alloy in 3.5 wt% NaCl solution is investigated by using electrochemical techniques and compared with that of pure magnesium, AZ31, and Mg–Al–Pb alloys.

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Sea Water Testing of Al-Zn, Al-Zn-Sn, and Al-Zn-In Sacrificial Anodes

CORROSION ◽

10.5006/1.3580802 ◽

1981 ◽

Vol 37 (9) ◽

pp. 533-540 ◽

Cited By ~ 11

Author(s):

Jorge B. Bessone ◽

Rafael A. Suarez Baldo ◽

Stella M. de de Micheli

Keyword(s):

Sea Water ◽

Water Testing ◽

Sacrificial Anodes

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Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Coatings ◽

10.3390/coatings11010101 ◽

2021 ◽

Vol 11 (1) ◽

pp. 101

Author(s):

Kaijin Huang ◽

Wei Li ◽

Kai Pan ◽

Xin Lin ◽

Aihua Wang

Keyword(s):

Corrosion Resistance ◽

Thermal Barrier Coating ◽

Laser Cladding ◽

Inconel 718 ◽

Electrochemical Techniques ◽

Thermal Barrier ◽

Nacl Solution ◽

Corrosion Performance ◽

Barrier Coating ◽

Inconel 718 Superalloy

In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

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Thermodynamics of In Situ Formation of Mg2Si and MgO in AZ91D /Flyash Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.686.378 ◽

2011 ◽

Vol 686 ◽

pp. 378-381

Author(s):

Si Rong Yu ◽

Zhi Qiu Huang ◽

Jia An Liu

Keyword(s):

Fly Ash ◽

Thermodynamic Calculation ◽

Interfacial Reactions ◽

Mg Alloy ◽

Free Enthalpy ◽

Alloy Matrix ◽

Microstructure Observation ◽

Enthalpy Changes ◽

Fly Ash Cenospheres

Novel AZ91D Mg alloy/fly-ash cenospheres (AZ91D/FAC) composites were fabricated by melt stir technique. The thermodynamic analyses of the interfacial reactions, the microstructure observation, and the phase analyses of the AZ91D/FAC composites were investigated. The results showed that the cenospheres were almost filled with Mg alloy matrix. In-situ MgO and Mg2Si phases were formed in Mg alloy matrix and near the interfaces between the cenospheres and Mg alloy matrix. Through the thermodynamic calculation, it can be found that the standard free enthalpy changes of these interfacial reactions are all negative at the temperature of Mg alloy melt preparation in this work, and these reactions can occur.

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