Papers by Author: M. Saremi

Abstract: Pulse electrodeposition was used to produce nanocrystalline (nc) copper from copper sulfate electrolyte with saccharin as additive. The grain size of nanocrystalline coatings was determined using x-ray diffraction and atomic force microscopy (AFM) which was about 30 nm. Microcrystalline copper deposits were also produced by direct current electrodeposition processes and compared with pulse plated ones. Corrosion behavior of the coatings was investigated using polarization and Impedance measurements in different solutions. The oxidation test was carried out at 650°C in an electrical furnace. It was demonstrated that the nanocrystalline film was markedly superior to regularly grained films made by direct current (DC) plating; nanocrystalline deposits show higher corrosion resistance and much higher oxidation resistance.

Abstract: Black powders coming from the interactions of pipe and other metals with the environment in gas transmission line can cause severe problems in the industry. In this work the composition of the collected black powder from up stream of the filtering system analyzed using XRF and XRD techniques. Erosion test is carried on the samples of impeller alloy in the black powder alcoholic slurry in a laboratory set up. It is shown that the main constituent of the black powder is magnetite. The rotation speed and presence of humidity can enhance the erosion/corrosion with the consequence of more black powder production.