Structure and Corrosion Behavior of Nano-Crystalline Ni-P Alloy Containing Tungsten
Samar Refaat Gooda,
Omyma Ramadan Mohammed Khalifa,
Aisha Kassab Abd El-Aziz,
Amany Hassan Marii
Issue:
Volume 10, Issue 1, March 2021
Pages:
1-5
Received:
9 December 2020
Accepted:
24 December 2020
Published:
12 January 2021
Abstract: The whole world is interested in the metal industry and its permanent development. One of these metals is carbon steel. Therefore, scientists tend to improve the properties of this metal, in this research we have improved the properties of carbon steel through electroless plating process of Ni-P and Ni-W-P alloys. In different industries, electroless nickel-phosphorus Ni-P and nickel-tungsten-phosphorus Ni-W-P deposits have been commonly used as engineering safety coatings. In our research, Ni-P and Ni-W-P were deposited on low carbon steel by using acid bath. To study the improvement of the properties of the coats, microstructure analysis investigated by thin film (XRD), coat’s morphology by electron microscope scan (SEM), analyzing the coat by X-ray dispersive energy (EDX) and protection of corrosion of the coats were determined by potentiodynamic polarization measurements in artificial sea water (3.5% NaCl solution). The results indicated that the phases formed from the electroless coating give excellent corrosion resistance of low carbon steel and also indicated that the alloy formed in the presence of tungsten through the electroless bath give higher corrosion protection than that formed without it. As the concentration of tungstate increase in the bath, coat has higher corrosion protection i.e. Ni-W-P III>Ni-W-P II >Ni-W-P I>Ni-P.
Abstract: The whole world is interested in the metal industry and its permanent development. One of these metals is carbon steel. Therefore, scientists tend to improve the properties of this metal, in this research we have improved the properties of carbon steel through electroless plating process of Ni-P and Ni-W-P alloys. In different industries, electrole...
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Comparative Study of S235 Steel Corrosion Inhibition by Eucalyptus camaldulensis and Cyperus rotundus Essential Oils in Hydrochloric Acid Solution
Khaly Cisse,
Diadioly Gassama,
Abdoulaye Thiam,
El Hadji Barka Ndiaye,
Momar Talla Gueye,
Modou Fall
Issue:
Volume 10, Issue 1, March 2021
Pages:
6-15
Received:
23 February 2021
Accepted:
9 March 2021
Published:
12 April 2021
Abstract: Synthetic compounds certainly exhibit good anticorrosive activity but also toxicity for humans and their environment. Because of these concerns, we turned to more environmentally friendly substances such as essential oils and of course other types of plant extracts. These products are considered green corrosion inhibitors. In this present study, we propose to make a comparative study of the inhibitory effect of extracts of two different essential oils, Eucalyptus camaldulensis (EC) and Cyperus rotundus (CR) on the corrosion of structural steel S235 in the medium 1 M hydrochloric acid. This inhibitory action was studied using potentiodynamic polarization measurements and electrochemical impedance spectroscopy. The GC-MS analysis of the essential oils extracts showed that EC contains 96.2% oxygenated terpenes (90.6% monoterpenes and 5.6% sesquiterpenes), whereas CR includes 78.1% oxygenated terpenes (70.6% sesquiterpenes and 7.5% monoterpenes). Polarization measurements indicate that EC and CR are mixed inhibitors. The experimental results gave an inhibition efficiency close to 78.9% for EC and 86.7% for CR for an inhibitor concentration of 4 gL-1 at 293 K. The inhibition performances of these essential oils were correlated with their composition. The adsorption of the molecules of the oils responsible for the inhibition on the surface of the steel, in the hydrochloric acid solution, obeys the Langmuir adsorption isotherm. This present work has therefore shown that these two types of essential oils have a good inhibitory effectiveness on the corrosion of the metal S235 in 1M hydrochloric acid solution.
Abstract: Synthetic compounds certainly exhibit good anticorrosive activity but also toxicity for humans and their environment. Because of these concerns, we turned to more environmentally friendly substances such as essential oils and of course other types of plant extracts. These products are considered green corrosion inhibitors. In this present study, we...
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