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Characterization of Ni-P-SiO2-Al2O3 nano-composite coatings on aluminum substrate

Rahemi Ardakani, S ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matchemphys.2016.12.023
  3. Publisher: Elsevier Ltd , 2017
  4. Abstract:
  5. In the present work, nano-composites of Ni-P-SiO2-Al2O3 were coated on a 6061 aluminum substrate. The surface morphology of the nano-composite coating was studied by field emission scanning electron microscopy (FESEM). The amount of SiO2 in the coating was determined by Energy Dispersive Analysis of X-Ray (EDX) and the crystalline structure of the coating was examined by X-ray diffractometer (XRD). All the experiments concerning the corrosion behavior of the coating carried out in 3.5%wt NaCl solution and evaluated by electrochemical impedance spectroscopy (EIS) and polarization technique. The results showed that an incorporation of SiO2 and Al2O3 in Ni-P coating at the SiO2 concentration of 10 g/L and 14 g/L Al2O3 led to the lowest corrosion rate (icorr = 0.88 μA/cm2), the most positive Ecorr and maximum microhardness (537 μHV). Furthermore, increasing the amount of nanoparticles in the coating was found to decrease CPEdl and improve porosity. © 2016 Elsevier B.V
  6. Keywords:
  7. Aluminum ; Coatings ; Composite coatings ; Corrosion ; Corrosion rate ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Field emission microscopes ; Nanocomposites ; Nanostructures ; Nickel ; Scanning electron microscopy ; X ray diffraction ; Crystalline structure ; Electrochemical techniques ; Energy dispersive analysis of X-rays ; Field emission scanning electron microscopy ; Nano-composite coating ; Polarization techniques ; X ray diffractometers ; X-ray diffraction topography ; Aluminum coatings
  8. Source: Materials Chemistry and Physics ; Volume 189 , 2017 , Pages 207-214 ; 02540584 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0254058416309221