Yazar "Radhi, Sabaa" seçeneğine göre listele

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    Evaluation the influence of steel-fiber on the concrete characteristics
    (International University of Sarajevo, 2022) Ali, Asma Mahdi; Falah, Mayadah W.; Hafedh, Alaa Adnan; Al-Khafaji, Zainab S.; Radhi, Sabaa
    The impact of steel fibers on the engineering characteristics of concretes were explored experimentally in this work. Steel fibers of 0.5, 0.7, and 0.9 percent by volume fraction were applied to concretes mixture with water/cements (W/C) proportions of 0.43 to accomplish this. There has been a total of 24 cubic specimens produced for compressive strengths testing, 24 cylindrical specimens for splitting tension strengths testing, and 12 cubic specimens for toughened unit weight testing. The experimental findings reveal that applying 0.5 percent to 0.9 percent of fibers made of steel to concrete boosts both compressive and tension strengths concurrently when compared to ordinary concretes; however, there is no discernible gain in hardened unit weight with increased fiber amounts.
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    Öğe
    Reducing oil pipes corrosion by (ZN-NI) alloy coating on low carbon steel substrate by sustainable process
    (Taylor's University, 2023) Radhi, Nabaa Sattar; Al-Khafaji, Zainab; Mareai, Basim M.; Radhi, Sabaa; Alsaegh, Ayam M.
    The problem of corrosion is quite risky and costly. There is always the possibility of bridges and buildings collapsing, oil pipelines bursting, chemical plants leaking, and bathroom flooding. Corroded medical implants might result in blood poisoning, corroded electrical connections could start fires and cause other problems, and worldwide air pollution could damage artwork. Corrosion threatens the safe disposal of radioactive waste that should be stored in containers for millennia. This study makes an effort to enhance further the electroplated layer's (Zn-Ni) alloy characteristics. In this study, samples of low-carbon steel are electrodeposited with layers of varying thicknesses of (Zn-Ni) from an alkaline solution throughout various coating times (15, 30, and 60 minutes). The mechanical and corrosion characteristics of the electrodeposits layer are determined using X-ray fluorescence (XRF), which is also utilized to analyse the microhardness and corrosion test results of the (Zn-Ni) deposited layer.
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    Study the effect of adding zirconia particles to nickel-phosphorus electroless coatings as product innovation on stainless steel substrate
    (De Gruyter, 2022) Abed, Khalid Mutashar; Radhi, Nabaa S.; Jasim, Ahlam Hamid; Al-Khafaji, Zainab S.; Radhi, Sabaa; Hussien, Safa A.
    Scholars have spent much time studying metal deposition procedures involving the deposition of elec-troless nickel, alloy, and composite coatings on various surfaces; the most current uses were feasible advantages of the coatings' many good properties for achieving the final product innovation. Lately, these coatings have demonstrated intriguing wear and corrosion resistance features, resulting in several innovative macro-level developments. The notion of composite coating by co-deposition coating has been presented in this article. The characteristics of Ni-Pb alloy coatings were examined by inserting particles into the electroless deposited solution. The stainless steel (SS) specimens have been electro-less coated with Ni-Pb and ZrO2 nanoparticles (size = 30-70 nm) at 0, 10, and 20 g/L amounts. The materials have been examined using scanning electron microscope and atomic force microscope, followed by wear-resistant and microhardness testing. According to the investigation findings, including inert particles improved the hardness magnitude and wearing resistance considerably. The base metal exhibited the highest wear rate at 10 N, while the-wear rate decreased in the Ni-Pb-ZrO2-coated SS316L by 34%. The Vickers hardness magnitudes of the Ni-Pb-ZrO2-coated samples at different ZrO2 contents (0,10, and 20 g/L) were 19, 50, and 81%, respectively.