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Journal of Marine Science and Application 2015年第4期14卷 459-462页

作者： Ojo Sunday Isaac Fayomi Malik Abdulwahab abimbola patricia ldowu popoola Ferdinand Asuke Department of Chemical Metallurgical and Materials Engineering Tshwane University of Technology X680 Pretoria South Africa Department of Mechanical Engineering Covenant University P.M.B 1023 Ota Ogun State Nigeria Department of Metallurgical and Materials Engineering Ahmadu Bello University P. M.B 1045 Zaria Nigeria

The present work focused on corrosion inhibition of AA6063 type Al-Mg-Si alloy in sodium chloride （NaCI） solution with a silicon carbide inhibitor, using the potentiodynamic electrochemical method. The aluminium alloy surface morphology was examined, in the as-received and as-corroded in the un-inhibited state, with scanning electron microscopy equipped with energy dispersive spectroscopy （SEM-EDS）. The results obtained via linear polarization indicated a high corrosion potential for the unprotected as-received alloy. Equally, inhibition efficiency as high as 98.82% at 10.0 g/v silicon carbide addition was obtained with increased polarization resistance fRy）, while the current density reduced significantly for inhibited samples compared to the un-inhibited aluminium alloy. The adsorption mechanism of the inhibitor aluminium alloy follows the Langmuir adsorption isotherm. This shows that the corrosion rate of aluminium alloy with silicon carbide in NaCI environment decreased significantly with addition of the inhibitor.

关键词： corrosion resistance silicon carbide sodium chloride (NaCI) aluminium alloy interface inhibition efficiency thin film adsorption isotherm potentiodynamic electrochemical method marine application

Anti-Corrosion and Tribo-Mechanical Properties of Co-deposited Zn–SnO_2 Composite Coating

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Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 521-530页

作者： Ojo Sunday Isaac Fayomi abimbola patricia Idowu popoola Department of Chemical Metallurgical and Materials EngineeringTshwane University of Technology Department of Mechanical Engineering Covenant University

Zn-SnO2 composite coatings were prepared by direct potential using electrolytic co-deposition technique from sulfate solution. The effect of Zn2＋ and SnO2 concentrations in deposited bath on the mechanical properties and mor- phological characteristics of the composite coatings were examined. The characterizations of the sample were analyzed using scanning electron microscopy couple with energy dispersive spectroscopy （SEM/EDS）, X-ray diffraction （XRD） and atomic force microscopy （AFM）. The electrochemical degradation behavior of the samples in 3.65 wt.% NaCl solution was studied using potentiodynamic polarization technique and characterized by high-resolution optical microscope. From all the fabricated composite coatings, obvious diffraction peaks were observed with Zn-7Sn-S-0.3V film with Zn2Sn7, Sn, Zn2Sn5 and Zn phases, confirming the presence and formation of Zn-SnO2 coating. The XRD pattern shows that the presences of SnO2 particle remarkably play a major role in the precipitation and orientation of the alloy matrix. From the SEM/EDS and AFM results, the deposits show that composite particle and proper bath composition have strong influence on the microstructure. An enhanced corrosion resistance was attained as a result of the induced particles.

关键词： Metal matrix composite Co-deposition Mechanical property Corrosion resistance

In-situ formation characteristic, tribological characterization and anti-corrosion properties of quaternary composites films

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Transactions of Nonferrous Metals Society of China 2014年第10期24卷 3170-3180页

作者： Ojo Sunday Isaac FAYOMI abimbola patricia Idowu popoola Department of Chemical Metallurgical and Materials EngineeringTshwane University of TechnologyP.M.B. X680 Pretoria South Africa

Improvements of wear and corrosion properties are essential characteristic in engineering application. A study was made on the structure, electro-oxidation and properties of fabricated Zn-Al-SnO 2-Ti O2（Zn-Al-Sn-Ti） thin films using electrodeposition technique from chloride bath. The microstructural studies were performed by scanning electron microscopy with attached energy dispersive spectrometer（SEM-EDS）, optical microscopy（OPM） and X-ray diffractogram（XRD）. The electrochemical oxidation and erosion behavior in 3.65% Na Cl medium were studied by potentiodynamic polarization technique and characterized by atomic force microscopy（AFM）. The hardness and wear behavior of the electrodeposited film were performed by high diamond dura scan microhardness tester and CERT UMT-2 reciprocating sliding machine. It was found that a successful co-deposition of composite and particle were attained. Homogeneous imbedded grain structure distribution and fine refinement of crystal with improved micromechanical behavior was achieved. The corrosion resistance, hardness and wear stability resistance of the fabricated quaternary films improved significantly in all varied process parameter.

关键词： co-deposition microstructural evolution anti-corrosion property composite materials

The Influence of Nickel on the Electrochemical Properties of Aluminium

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材料科学与工程（中英文版） 2010年第12期4卷 74-85页

作者： abimbola patricia popoola Sisa Pityana Victoria Adams Department of Chemical and Metallurgical Engineering Tshwane University of Technology Pretoria South Africa Centre for Scientific and Industrial Research National Laser Centre Pretoria 0001 South Africa

Sacrificial Anode Stability and Polarization Potential Variation in a Ternary Al-xZn-xMg Alloy in a Seawater-Marine Environment

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Journal of Marine Science and Application 2016年第2期15卷 208-213页

作者： Abubakar Muazu Yaro Shehu Aliyu Malik Abdulwahab abimbola patricia Idowu popoola Department of Mechanical Engineering Bayero University Kano P.M.B 3011 Nigeria Department of Metallurgical and Materials Engineering Ahmadu Bello University Zaria PM.B 1045 Nigeria Department of Chemical Metallurgical and Materials Engineering Tshwane University of Technology Pretoria X680 South Africa Department of Mechanical Engineering Ahmadu Bello University Zaria P.M.B 1045 Nigeria

In this paper, the effects of zinc （Zn） and magnesium （Mg） addition on the performance of an aluminum-based sacrificial anode in seawater were investigated using a potential measurement method. Anodic efficiency, protection efficiency, and polarized potential were the parameters used. The percentages of Zn and Mg in the anodes were varied from 2% to 8% Zn and 1% to 4% Mg. The alloys produced were tested as sacrificial anodes for the protection of mild steel in seawater at room temperature. Current efficiency as high as 88.36% was obtained in alloys containing 6% Zn and 1% Mg. The polarization potentials obtained for the coupled （steel/Al-based alloys） are as given in the Pourbaix diagrams, with steel lying within the immunity region/cathodic region and the sacrificial anodes within the anodic region. The protection offered by the sacrificial anodes to the steel after the 7th and 8th week was measured and protection efficiency values as high as 99.66% and 99.47% were achieved for the A1-6%Zn-l%Mg cast anode. The microstructures of the cast anodes comprise of intermetallic structures of hexagonal Mg3Zn2 and body-centered cubic A12Mg3Zn3. These are probably responsible for the breakdown of the passive alumina film, thus enhancing the anode efficiency.

关键词： sacrificial anode anode efficiency protection efficiency polarization potential intermetallic phase alloying elements theoretical current capacity flee electron seawater surface films

Modeling and Simulation of Hydrogen Storage Device for Fuel Cell Plant

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Journal of Chemistry and Chemical Engineering 2012年第7期6卷 604-612页

作者： Akanji Olaitan Lukman Obadele Babatunde Abiodun Oluranti Sadiku-Agboola patricia abimbola popoola Emmanuel Rotimi Sadiku Department of Chemical & Metallurgical Engineering Faculty of Engineering and The Built Environment Tshwane University of Technology Pretoria West 0001 Pretoria South Africa Department of Mechanical Engineering Faculty of Engineering and Built Environment Tshwane University of Technology Lynrrwoodridge 0001 South Africa

The article reviews a brief literature on the modeling of hydrogen storage device for fuel cell. Different dimensional approaches in modeling hydrogen absorption/desorption in a metal hydride reactor for use in fuel cell are summarized. Mathematical modeling equations involved are also stated. The effect of various operating parameters such as temperature, concentration, viscosity, thermal conductivity and time on the gas is also verified. The importance of various simulation software with reference to their major functions is also identified. The review concludes on the opportunities and challenges with the use of hydrogen as an alternative renewable energy.

关键词： Modeling simulation hydrogen storage fuel cell.