Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 18, Issue 6, Pages 1701-1716Publisher
SPRINGER
DOI: 10.1007/s10008-014-2417-z
Keywords
Electrochemical quartz crystal microbalance (EQCM); Cyclic voltammetry; Saccharin; Nanostructured CoFe alloy
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Funding
- Natural Sciences Engineering Research Council of Canada (NSERC)
- Ministry of Higher Education, Malaysia
- Universiti Teknologi MARA
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Nanostructured cobalt (Co) and cobalt-iron (CoFe) alloy coatings were electrodeposited from sulfate solutions in the presence and absence of saccharin. The effects of saccharin on the corrosion behavior of Co and CoFe alloy coatings were investigated using the electrochemical quartz crystal microbalance (EQCM) technique coupled with cyclic voltammetry (CV) measurements. Saccharin was added to the electrolyte as a grain refiner and brightener. Interestingly, opposite corrosion behaviors were found for all nanostructured coatings in 0.1 M H2SO4 and 0.1 M NaOH. The use of saccharin as an additive in the plating solution accelerated the anodic reaction for all deposits in acidic medium. The mass decreases while dissolution rate increased with higher saccharin concentration. Meanwhile, formation of a thick passive film on the Co electrode surface were enhanced while a hindering effect was observed for CoFe alloy coatings deposited in the presence of saccharin in alkaline solution. The anodic and cathodic curves obtained from potentiodynamic polarization experiments were also in agreement with the EQCM results.
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