Journal :   Asian Journal of Research in Chemistry

Volume No. :   7

Issue No. :  6

Year :  2014

Pages :   551-557

ISSN Print :  0974-4169

ISSN Online :  0974-4150


Registration

Allready Registrered
Click to Login

Evaluation of Corrosion Resistance of Electroless Ni-P/Ni-W-P Double Layer Coatings on 6061 Aluminium Alloy



Address:   P Arockiasamy, G. Thenmozhi, R Jaya Santhi*
P.G & Research Department of Chemistry, Auxilium College, Vellore - 632 006, India
*Corresponding Author
DOI No:

ABSTRACT:
The electroless Ni-P/Ni-W-P double layer coating in as-plated condition on 6061 aluminium alloy substrate were prepared. The morphology of the prepared Ni-P/Ni-W-P double layer coatings were found out from SEM analysis and phases were found out using XRD. The corrosion resistance of the Ni-P/ Ni-W-P coatings were compared by electrochemical impedance spectroscopy and potentiodynamic polarization studies in 3.5 wt.% NaCl solution. Microhardness of the Ni-W-P has the better hardness value than Ni-P coating. The values of EIS and potentiodynamic polarization studies indicate that the corrosion resistance values for Ni-P/Ni-W-P coatings were higher when compared to Ni-P coatings. This may be due to presence of W elements on the aluminium substrates. The results indicate that the Ni-W-P coating can be a better corrosion protection material on aluminium alloys than Ni-P coatings.
KEYWORDS:
Electroless Ni-P/Ni-W-P, Corrosion resistance, Aluminium alloys, EIS, Potentiodynamic polarization.
Cite:
P Arockiasamy, G. Thenmozhi, R Jaya Santhi. Evaluation of Corrosion Resistance of Electroless Ni-P/Ni-W-P Double Layer Coatings on 6061 Aluminium Alloy. Asian J. Research Chem. 7(6): June 2014; Page 551-557.
[View HTML]      [View PDF]



Visitor's No. :   204974