Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.63: Poster

Thursday, March 19, 2015, 09:30–12:00, Poster A

Effect of W concentration in the bath on composition, microstructure, morphology aspects and electrochemical properties of Ni-W coatings on aluminum — •Hida Rassaie, Sina Sadreddini, and Golsa Rassaie — Department of Materials Science and Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

In this study, the surface morphology of Ni-W composite coating was investigated by field emission scanning electron microscopy (FESEM). The crystalline structure was examined by X-Ray diffraction (XRD) and the Corrosion behavior of coating was evaluated by electrochemical impedance spectroscopy (EIS) and polarization techniques. Increment of W percentage in the bath caused to refine grain size and changed the crystalline structure. FESEM testes demonstrated spherical morphology in all exams. Corrosion resistance in chloride solution was improved by increasing the concentration of tungsten in coating. In addition, increment the alloy element in the bath affected the charge transfer.