Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 24    No. 10    October 2014

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Electrodeposition mechanism of Ni-Al composite coating
Mohsen ADABI, Ahmad Ali AMADEH

School of Metallurgy and Materials Engineering, College of Engineering,
University of Tehran, P.O. Box 11155-4563, Tehran, Iran

Abstract:Ni-Al composite coatings were electrodeposited from a modified Watts solution. The electrochemical behavior of the coatings was studied by means of zeta potential analysis, voltammetry and electrochemical impedance spectroscopy (EIS). It was found that the zeta potential of Al particles was -4 mV which is very close to that of Al2O3. Moreover, addition of conductive Al particles into the electrolyte shifted the polarization curve to more negative potentials and loop size of EIS curve increased. It was also demonstrated that the co-deposition behavior of Ni-Al composite coatings obeys the Guglielmi’s model. The results indicate that conductive Al particles behave as the inert particles and confirm the existence of a thin aluminum oxide layer on the surface of aluminum particles.


Key words: Ni-Al coating; zeta potential; voltammetry; electrochemical impedance spectroscopy (EIS)

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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