Corrosion in NanocoatingsOpen Access

EVALUATION OF ELECTROLESS NI-P AND NI-P NANO-COMPOSITE COATINGS' PROPERTIES

School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Tehran, Iran, P.O. Box: 11155-4563, Tel/Fax: +982161114108, Iran

Associate Professor and Member of Center of Excellence in High Performance Ultra Fine Materials.

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A. Zarebidaki

School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Tehran, Iran

PhD Student in Metallurgy and Materials Engineering.

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T. Rabizadeh

School of Metallurgy and Materials Engineering, University College of Engineering, University of Tehran, Iran

MSc Student in Corrosion and Protection Engineering.

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https://doi.org/10.1142/S2010194512002796Cited by:6 (Source: Crossref)

Abstract

SiC and SiO₂ nano-particles were co-deposited with electroless NiP coating onto API-5L-X65 steel substrates with 7g/L load of nano-particles in the bath at pH 4.6 ± 0.2 and temperature of 90 ± 2°C. The hardness and corrosion resistance of the composite coatings were measured using micro-hardness, polarization and electrochemical impedance spectroscopy techniques, respectively. Moreover, the structure of the composite coatings was investigated by means of X-ray diffraction (XRD) technique, while their morphologies and elemental compositions were analyzed using a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS). Results showed that co-deposited nano-particles caused an increase in the hardness of the composite 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 particles decreased, due to the agglomeration of SiC nano-particles together with an increase in the porosity of the composite coatings.

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