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Effect of phosphoric acid concentration on conductivity of anodic passive film formed on surface of lead-indium alloy

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Transactions of Nonferrous Metals society of China 2016年第3期26卷 882-894页

作者： Abdel-Rahman EL-sAYED hos.nia.s.mohran Hoda Abdel shafy sHILKAMY Department of Chemistry Faculty of Science Sohag UniversitySohag 82524Egypt

The addition of phosphoric acid into sulfuric acid solution is mentioned to be helpful in the reduction of sulfation after deep discharge of lead-acid battery. The anodic behavior of Pb and Pb?In alloys was studied in pure phosphoric acid and sulfuric acid containing various concentrations of phosphoric. The electrochemical measurements were performed using potentiodynamic, potentiostatic and cyclic voltammetric techniques. The composition and morphology of passive layer formed on the surfaces of Pb and Pb?In alloys were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy analysis (EDX) and scanning electron microscopy (sEM). The potentiodynamic study shows that the passive current density increases with increasing the indium content in the alloy in the examined solutions. The addition of 0.1 mol/L H3PO4 into theelectrolyte is more effective to decrease the thickness of passive film on the surface of alloys containing higher indium content (10% and 15%). The XRD, EDX and sEM data reveal that the formation of PbsO4 and PbO on the surface decreases with increasing the indium level in the alloy and is completely prevented at higher indium content (15%) in mixed acid.

关键词： lead-indium alloy phosphoric acid anodic behavior passive film lead-acid batteries

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Role of nickel alloying on anodic dissolution behavior of zinc in 3.5% NaCl *** II:Potentiodynamic,potentiostatic and galvanostatic studies

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Transactions of Nonferrous Metals society of China 2015年第9期25卷 3152-3164页

作者： Hany M.ABD EL-LATEEF Abdel-Rahman EL-sAYED hos.nia.s.mohran Chemistry Department Faculty of ScienceSohag University

Zinc is common metal used for steel protection from *** addition of further element,such as Ni,can modify the corrosion rate and maintain sacrificial *** anodic dissolution behavior of Zn,Ni and Zn-Ni alloys with different Ni contents（from 0.5% to 10%,mass fraction） in 3.5% Na Cl solution was investigated using potentiodynamic,potentiostatic and galvanostatic *** composition and microstructure of the corrosion layer on Zn,Ni and Zn-Ni alloys were characterized by energy-dispersive X-ray spectroscopy analysis（EDX） and scanning electron microscopy（sEM）.The galvanostatic curves show that the anodic behavior of all investigated electrodes exhibits active/passive transition and the tendency of the alloys to passivity decreases with the increase in Ni content,except for 99.5Zn-0.5Ni *** the potentiodynamic curves exhibit active passive transition only for pure *** analysis reveals the presence of oxides,chlorides and metal hydroxide chloride in corrosion products,and very small cracks are observed for 90Zn-10 Ni alloy compared with that of Zn.

关键词： corrosion NaCl solution Ni content Zn-Ni alloy anodic behavior

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Role of Ni content in improvement of corrosion resistance of Zn-Ni alloy in 3.5% Na Cl solution. Part I: Polarization and impedance studies

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Transactions of Nonferrous Metals society of China 2015年第8期25卷 2807-2816页

作者： Hany M.ABD EL-LATEEF Abdel-Rahman EL-sAYED hos.nia.s.mohran Chemistry Department Faculty of Science Sohag University

Zn plays an important role in the protection of iron and steel from corrosion in sea water, and the alloying of Zn and Ni can improve its corrosion resistance. The corrosion behavior of Zn？Ni alloys in synthetic sea water （3.5% NaCl, mass fraction） was studied using Tafel plot and electrochemical impedance spectroscopy （EIs） techniques. The corrosion resistance of the investigated alloys with various Ni contents （0.5%？10%, mass fraction） was compared with that of Zn. The results show that the corrosion resistance of Zn？Ni alloys （except 0.5% Ni） is superior to that of Zn. The 10% Ni gives the highest corrosion resistance due to the formation ofγ-Zn3Ni withγ-ZnNi phases in the alloy. In the case of alloy I （0.5% Ni）, it exhibits a higher corrosion rate （less corrosion resistance） than Zn.

关键词： Zn-Ni alloy Ni content corrosion resistance Cl- ions impedance polarization

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