S.M. Rashwan

Bio: S.M. Rashwan is an academic researcher from Suez Canal University. The author has contributed to research in topics: Boric acid & Sodium citrate. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

Electrodeposition of Copper-Nickel Alloys from a Citrate Bath Containing Boric Acid

Abstract: Copper-nickel alloys have been electrodeposited on steel substrates from a bath containing copper sulphate, nickel sulphate, sodium sulphate, sodium citrate and boric acid. Galvanostatic cathodic p...

Nano-nickel–copper alloy deposit for improved corrosion resistance in marine environment

Abstract: The nickel–copper alloy (70:30) prepared by metallurgical route is currently employed in marine environments because of its good resistance to corrosion. This alloy forms a thin protective surface layer when exposed to marine atmosphere and thus provides its corrosion resistance. Electrodeposition of nickel–copper alloy from sulphamate acetate-based electrolyte is a new and novel approach and was experimented. The detailed study was performed on the effect of electrolyte composition, current density and pH on the preparation of alloy deposit; the prepared alloy deposit particle size is of 78 nm, and the surface morphology of the alloy deposit was characterized with X-ray diffraction, scanning electron microscopy, EDAX, and atomic force microscope. Nickel–copper alloy deposited from the sulphamate acetate-based electrolyte operated at a temperature of 30 °C, with a pH of 6.6 and at 3 A/dm2, produces nickel–copper (70:30) alloy deposit. The corrosion behaviour of this alloy deposit was studied by potentiodynamic polarization method; the corrosion current of nickel is 8.67 μA cm−2 and the nickel–copper alloy is 2.65 μA cm−2.

Electrodeposition of Cu – Al2O3 Thin Films and Microposts in Ammonia-Citrate Electrolytes

Abstract: The electrodeposition of Cu-γ-Al 2 O 3 nanocomposites as thin films and into recessed electrodes prepared with X-ray lithography was examined in ammonia-citrate electrolytes. Partial current density, current efficiency and deposit particle concentration were determined with a rotating disk electrode. At pH 8 the presence of particles resulted in an enhancement of the Cu reaction rate, while at pH 10 the reaction rate appeared inhibited. The amount of particles in the deposit and current efficiency was larger for pH 8 than pH 10, rendering the pH 8 solution a more promising electrolyte to electrodeposit 500 μm deep recesses for MEMS composite components.

Brass Alloy Coatings Electrodeposited from an Environmentally Friendly Alkaline Lactate Bath under Different Operating Conditions

Abstract: The electroplating of brass alloy coatings onto a steel substrate was established using a lactic acid solution under diverse practical conditions. CuSO4.5H2O, ZnSO4.7H2O, CH3CHOHCOOH, and anhydrous Na2SO4 were used to make the deposition bath. The impact of bath components, deposition current, as well as temperature on the current efficiency (CE) and alloy microstructure was examined. The deposition of the alloy is of the normal type. The CE is good, and it improves when the [Zn2+] / [Cu2+] ratio in the bath increases. On the other hand, the efficacy declines when the current density, temperature, and lactic acid concentration increase. By elevating the applied current density, or raising the concentration of the Zn2+ ions in the tub, the amount of Zn metal in the plated alloy is increased. SEM, energy dispersion X-ray, and X-ray diffraction techniques are being used to investigate the coating’s morphology and crystal texture. The presence of copper and zinc metals in the deposit was confirmed by EDX analysis. The new bath’s deposits are well-crystalline and contain a Cu5 Zn8 phase. The bath’s throwing power and throwing index are determined, and it is found that the alkaline lactate tub has satisfactory throwing power and throwing index.