Browsing by Author "Ibrahim H.K"

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    Production of Abrasive Sandpaper using Periwinkle Shells and Crab Shells
    (Published by Dhaka University of Engineering & Technology, Gazipur, Bangladesh, 2020-06-30) AMBALI IBRAHIM OWOLABI; Shuaib–Babata Y.L; Abdulqadir L.B; Ibrahim H.K; Aremu I.N; Ibraheem T.O
    In this study, the properties of periwinkle shell and crab shell grains, such as hardness, compressive strength and wear resistance were examined for their suitability as abrasive materials. The binding effect of polyester resin at high concentration was also considered. Through the process of crushing, grinding and subsequently sieving using ASTM E11 set of sieves, the shells were processed into grit standards grain sizes of P40 and P60. Furthermore, by mixing and mould compression using a hydraulic press polymer matrix composite with particles varying from 96 wt.% to 92 wt.% and resin 3 wt.% to 7 wt.% with 1 wt.% each of cobalt naphthalene and methyl ethyl ketone peroxide hardener respectively were developed from the grits. It was found that, with an increase in polyester resin content, the hardness and compressive strength increased, while the wear rate decreased. The composition with 92 wt.% periwinkle shell grains to 7 wt.% polyester resin was found to be with the most improved abrasive properties
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    The effect of Magnesium addition on the performance of Aluminium-Zinc–Copper alloy as a sacrificial anode in seawater
    (2026-05-31) AMBALI IBRAHIM OWOLABI; Shuaib-Babata Y.L; Omokheni E.I; Busari Y.O; Abdulqadir L.B; Ejiko S.O; Ibrahim H.K; Muraina S.A
    This paper presents an experimental investigation on effectiveness of the addition of magnesium (Mg) on the performance of aluminium-zinc-copper (Al-Zn-Cu) alloy as a sacrificial anode to protect low carbon steel in seawater. The chemical compositions of mild steel sample, Aluminium alloyed and that of the medium (seawater) were determined using optical emission spectroscopy. Samples of Al-Zn-Cu alloy alloyed with 0.5%, 1.0% and 1.5% by weight of magnesium were prepared and produced by casting technique to produce the sacrificial anodes. Subsequently, the anodes were mechanically joined with the mild steel by force-fitting them together to produce specimens for corrosion test. The effectiveness of the sacrificial anodes for the protection of mild steel in seawater was examined using the gravimetric technique (for a period of 168 – 2016 hours) and potentiodynamic analysis. The results showed that the Al-Zn-Cu-1.0% Mg gave the maximum protection efficiency of 99.85% (for 2016 hours) and 99.98% through gravimetric and potentiodynamic analysis respectively, better than the efficiency of 99.26% (for 168 hours) and 99.53% (for 336 hours) attained by adding Zinc and Tin respectively to the aluminium alloy in previous studies. Thus, the addition of Mg to Al-Zn-Cu alloy was effective and suitable as a sacrificial anode in seawater