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Corrosion behavior and microhardness of Ni-P-SiO2-Al2O3 nano-composite coatings on magnesium alloy

Sadreddini, S ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-017-2632-8
  3. Publisher: Springer New York LLC , 2017
  4. Abstract:
  5. In the present work, nano-composites of Ni-P-SiO2-Al2O3 were coated on AZ91HP magnesium alloy. 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/Land 14 g/LAl2O3 led to the lowest corrosion rate (icorr = 1.3 µA/cm2), the most positive Ecorr and maximum microhardness (496 VH). Furthermore, Ni-P-SiO2-Al2O3 nano-composite coating possesses less porosity than that in Ni-P coating, resulting in improving corrosion resistance. © 2017, ASM International
  6. Keywords:
  7. EIS ; Nano-composite ; XRD ; Aluminum ; Aluminum coatings ; Corrosion ; Corrosion rate ; Corrosion resistance ; Corrosive effects ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Field emission microscopes ; Magnesium ; Magnesium alloys ; Microhardness ; Nanocomposites ; Nickel ; Polarization ; Scanning electron microscopy ; Corrosion behavior ; Crystalline structure ; Energy dispersive analysis of X-rays ; Field emission scanning electron microscopy ; NaCl solution ; Nano-composite coating ; Polarization techniques ; X ray diffractometers ; Composite coatings
  8. Source: Journal of Materials Engineering and Performance ; Volume 26, Issue 5 , 2017 , Pages 2032-2039 ; 10599495 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11665-017-2632-8