نوع مقاله : مقاله علمی پژوهشی
نویسندگان
دانشکده شیمی، دانشگاه سمنان، سمنان، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In the present study, Ni-W-P nanocomposite coatings were prepared by electroless method. The surface morphology and composition of the coatings were analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) while the crystal structure of the coatings was analyzed by X-ray diffraction (XRD). The corrosion of these coatings in 3.5% sodium chloride solution was investigated by Tafel polarization and electrochemical impedance spectroscopy methods, and the corrosion parameters including corrosion potential, corrosion current density, and corrosion resistance were obtained. Also, the parameters affecting the properties of these coatings such as pH, temperature, and the amount of sodium tungstate in the electroless bath were investigated. Accordingly, the optimal value of the parameters was determined as pH=8, temperature 95 oC, and sodium tungstate content of 16 g/l. Corrosion analyses showed that the presence of tungsten in the Ni-P composite coating greatly improves the corrosion properties and increases corrosion resistance. The highest inhibition efficiency for Ni-P and Ni-W-P coatings using the Tafel polarization method was obtained 37.4% and 80.6%, respectively.
کلیدواژهها [English]
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