An Investigation on Effects of Incorporation of Nano-SiO2 and Nano-SiC Particles on Electroless Nickel Base Coating Properties
Publish place: 2nd International Conference on Automotive Paint and Coating
Publish Year: 1388
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ICAPC02_022
تاریخ نمایه سازی: 22 تیر 1388
Abstract:
Electroless Ni–P/nano-SiO2 and Ni–P/nano-SiC composite coatings were prepared using hypophosphite reduced electroless nickel bath containing nano-SiO2 or nano- SiC particles with 7g/L load at pH 4.6 ± 0.2 and temperature 90 ± 2°C. Scanning electron microscopy (SEM), Energy Dispersive Analysis of X-ray (EDAX), X-ray diffraction (XRD), polarization and electrochemical impedance spectroscopy (EIS) were used to analyze morphology, structure and corrosion resistance of the coatings, respectively Energy Dispersive Analysis of X-ray (EDAX) results demonstrated presence of nano-particles in nano-composite coatings. The X-ray diffraction (XRD) pattern of Ni–P/nano-SiO2 and Ni-P/nano-SiC coatings were very similar to that of plain electroless Ni-P coating. SEM morphology of the deposits revealed that nano-particles distribution was to some extend uniform on the coatings. Corrosion tests showed that addition of nano-SiO2 particles improved corrosion resistance of electroless Ni-P coatings in salty atmosphere but addition of nano-SiC coatings decreases it.
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Authors
T Rabizad
MSc Student,
S. R. Allahkaram
Associate Professor and Member of Center of Excellence in High Performance Ultra Fine Materials
A Zarebidak
PhD Student School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran
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