Materials and Biomaterials Science 2020-07-25T13:04:09+02:00 Abdellah Henni Open Journal Systems <div class="page" title="Page 2"> <div class="section"> <div class="layoutArea"> <div class="column"> <p><strong>Materials and Biomaterials Science</strong> is an international journal for the publication, covering all aspects of the production of (bio) materials or the properties or applications of (bio) materials related to to differents technologies. Its scope encompasses insights into the chemistry, biology and materials science underpinning (bio) materials research and the new concepts in (bio) materials design.</p> </div> </div> </div> </div> The influence of a heat treatment on properties of Cu-Zn alloy from a cyanide-free and Zinc sulphate baths 2020-07-25T12:13:33+02:00 Ilyes Abacha Salah Boukherissa <div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p>We present an alternative method aiming to reduce the toxicity and the cost of electropla- ting of Cu-Zn alloy (usually prepared from cyanide baths) while maintaining the decorative qualities and anticorrosive properties of the coating. For this purpose, Cu-Zn alloys were obtained in two steps from non-cyanide electrolytes. First, a copper layer electrodeposited onto a nickel under-layer, followed by a thin layer of zinc from three different simple non- cyanide zinc baths. The Zn/Cu/Ni sandwich system was then subjected to heat treatment at a temperature of 400°C, to ensure the diffusion of zinc into the copper layer to give the desired Cu-Zn alloy structure. The synthesized films were characterized by using X-ray diffraction XRD, scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS). XRD demonstrated that the electrodeposited films are crystalline and present the Cu<sub>0.7</sub>Zn<sub>0.3</sub> phase with preferential (111) orientation. An analysis of XRD patterns revealed that after heat treatment, the Cu-Zn alloys were composed of a predominating α-phase structure. The morphology and composition of the coatings depends on the zinc plating bath type. After annealing, well defined pseudo-spherical Cu-Zn grains were formed cove- ring the entire substrate surface. The EDS analysis indicated the formation of Cu0.7Zn0.3 brass alloys, corrosion was studied by impedance spectroscopy. The results showed the feasibility of this low-cost and new route for the preparation of good quality Cu–Zn alloys from cyanide-free electrolytes.</p> </div> </div> </div> 2020-08-23T00:00:00+02:00 Copyright (c) 2020 Materials and Biomaterials Science Multi-response modeling and optimisation of wastewater pretreatment by bentonite 2020-07-25T13:04:09+02:00 Ridha Lessoued Fatiha Souahi <div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p>The disposal of municipal waste by landfill is widely used around the world. Treatment of landfill leachate generated from these sites has become essential because of its several en- vironmental threats. The main objective of this study is the treatment of leachate of Ouled Fayet (Algeria). Bentonite collected from the region of Maghnia (Algeria) was employed to optimize the removal efficiency of chemical organic demand (COD) and Nitrite (NO2-). The effect of stirring speed and contacting time was studied. Algerian bentonite showed significant removing potential for COD, NO2- and PO4-3 successively 75%, 67% and 72%. The experimental data and model predictions agreed well. COD, NO2- and PO4-3 removal efficiencies of 75%, 69% and 72% were demonstrated. The results found have provided a cost-effective method for treatment of landfill leachate.</p> </div> </div> </div> 2020-04-17T00:00:00+02:00 Copyright (c) 2020 Materials and Biomaterials Science Corrosion Inhibition Performance of Rosmarinus officinalis Methanolic Extract on Carbon Steel XC48 in Acidic Medium (2M HCl) 2020-07-25T12:24:12+02:00 Amina Belakhdar Hana Ferkous Souad Djellali R. Sahraoui Hana Lahbib Yasser Ben Amor <div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p>The inhibition ability of the methanolic extract of Rosmarinus officinalis on the corrosion of mild steel (XC48), in HCl solution (2M), was investigated at various temperatures (298– 328 K) via weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the inhibition efficiency increased with the increase of the extract concentration to reach a maximum of 89,18% at 200 ppm. A further augmentation of the extract concentration led to some deterioration of the inhibition efficiency which dropped to 77,18 % at 400 ppm. This high efficacity may be attributed to the production of a protective layer on the surface of the electrode which is confirmed by the scanning electron microscopy (SEM) images. The investigation of the temperature effect on the inhibition efficiency and the determination of the different thermodynamic parameters, allowed us to deduce a physisorption mechanism of Rosmarinus officinalis extract on the surface of the metal. On the other hand, the results of the poten- tiometric polarization tests revealed that the extract components are acting as a mixed- type inhibitor.</p> </div> </div> </div> 2020-02-26T00:00:00+01:00 Copyright (c) 2020 Materials and Biomaterials Science