Chandrasekar, M.S. and Shanmugasigamani, S. and Pushpavanam, M. (2010) Synergetic effects of pulse constraints and additives in electrodeposition of nano-crystalline zinc:Corrosion,structural and textural characterization. Materials Chemistry and Physics, 124. pp. 516-528.

PDF Restricted to Registered users only Download (3419Kb) | Request a copy

Abstract

Pulse electrodeposition was to produce nanocrystalline(nc) zinc from alkaline non-cyanide electrolyte with primary and secondary additives. The combined effect of pulse parameters(ON-time(TON), OFF-time (TOFF), pulse peak current density(IP)) and additives on the corrosion properties (evaluated using electrochemical techniques) of zinc electrodeposits are elucidated in terms of surface morphology(using scanning electron microscope),topography and rootmeansquare(RMS)roughness(using atomic force microscope), crystallitesize,its orientations and relative texture co-efficient(RTC,%)were evaluated using X-ray diffraction.The corrosion resistance of zinc electrodeposits obtained at constant TON and IP enhanced (i.e.,low Icorr and high Rct values) with increased TOFF. Atconstant TOFF and IP, the Icorr values increased and Rct values decreased with TON while the former decreases and latter increases with IP at constant TON and TOFF. The inclusion of primary and secondary additives in to the electrolyte pro- duced nc zinc electrodeposits at 5Adm−2, showed enhanced protective properties(Icorr—16-Acm−2 and Rct—481.8-cm−2). inegrained due to high negative over potential,reduced roughness and higher per-centage of basal plane[00.2] orientation have major impact for the enhanced corrosion resistances.

Item Type:	Article
Uncontrolled Keywords:	Corrosion test; Electron microscopy(SEM); Atomic forcemicroscopy(AFM); Crystallography
Subjects:	Industrial Metal Finishing
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	08 May 2012 09:09
Last Modified:	08 May 2012 09:09
URI:	http://cecri.csircentral.net/id/eprint/519

Actions (login required)

View Item