Nano Archive

An investigation on corrosion resistance of as-applied and heat treated Ni-P/nanoSiC coatings

Bigdeli, F. and Allahkaram, S. R. (2009) An investigation on corrosion resistance of as-applied and heat treated Ni-P/nanoSiC coatings. MATERIALS & DESIGN , 30 (10). pp. 4450-4453. ISSN 0261-3069

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Official URL: http://www.sciencedirect.com/science?_ob=ArticleUR...

Abstract

EN-SiC coatings are recognized for their hardness and wear resistance. in this work electroless Ni-P coatings containing nano Sic particles were co-deposited on St37 tool steel substrate. Scanning electron microscopy (SEM), energy dispersive spectrum (EDS), X-ray diffraction (XRD), polarization and electrochemical impedance spectroscopy (EIS) were used to analyze morphology, structure and corrosion resistance of the coatings. The results showed that Sic nano-particles co-deposited homogeneously, and the structure of Ni-P-SiC nano-composite coatings as deposited was amorphous. Heat-treatment at 400 degrees C for 1 h induced crystallization of the electroless Ni-P coatings. Microhardness of electroless Ni-P-SiC composite coatings increased due to the existence of nano-particles, and reached to a maximum value after heat-treatment Corrosion tests showed that both electroless nickel and electroless nickel composite coatings demonstrated significant improvement of corrosion resistance in salty atmosphere. Proper post heat-treatment significantly improved the coating density and structure, giving rise to enhanced corrosion resistance. (C) 2009 Elsevier Ltd. All rights reserved.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:7760
Deposited By:JNCASR
Deposited On:16 Nov 2009 10:28
Last Modified:16 Nov 2009 10:28

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