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- Title
Synthesis and performance of electroless Ni-P-TiCN composite coatings on Al substrate.
- Authors
Hassan, H. B.; Abdel Hamid, Z.; Hassan, Mona
- Abstract
Electroless Ni-P and Ni-P-TiCN composite coatings have been deposited successfully on Al substrates. Scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques were applied to study the surface morphology and the chemical composition of the deposited films. Moreover, X-ray diffraction (XRD) proved that Ni-P and Ni-P-TiCN deposits have amorphous structures. The properties of Ni-P-TiCN/Al composite films such as hardness, corrosion resistance and electrocatalytic activity were examined and compared with that of Ni-P/Al film. The results of hardness measurements reveal that the presence of TiCN particles with Ni-P matrix improves its hardness. Additionally, the performance against corrosion was examined using Tafel lines and electrochemical impedance spectroscopy techniques in both of 0.6 M NaCl and a mixture of 0.5 M H2SO4 with 2 ppm HF solutions. The results indicate that the incorporation of high dispersed TiCN particles into Ni-P matrix led to a positive shift of the corrosion potential and an increase in the corrosion resistance for all aluminum substrates after their coating with Ni-P-TiCN. In addition, Ni-P-TiCN/Al electrodes showed a higher electrochemical catalytic activity and stability toward methanol oxidation in 0.5 M NaOH solution compared with that of Ni-P/Al. Copyright © 2014 John Wiley & Sons, Ltd.
- Subjects
CORROSION &; anti-corrosives; ELECTROCHEMICAL analysis; IMPEDANCE spectroscopy; ELECTROLESS deposition; ELECTROCATALYSIS; SURFACE morphology; ENERGY dispersive X-ray spectroscopy
- Publication
Surface & Interface Analysis: SIA, 2014, Vol 46, Issue 8, p512
- ISSN
0142-2421
- Publication type
Article
- DOI
10.1002/sia.5530