|Author||Arunprasad, K. ♦ Giridhar, P. ♦ Ravindran, V. ♦ Muralidharan, V. S.|
|Source||CSIR-Central Electrochemical Research Institute|
|Subject Domain (in DDC)||Technology ♦ Manufacturing|
|Abstract||Zinc-Cobalt electrodeposits offer enhanced corrosion protection to steel, compared to zinc deposits. A near neutral zinc-cobalt alloy sulfate bath was developed. In the absence of b-naphthol and sodium lauryl sulfate (SLS), only a light grey and non-uniform deposit was obtained. Addition of boric acid yielded a grey and uniform deposit. To obtain the grey uniform alloy deposit, the optimum bath composition was: 0.5 M ZnSO4, 0.5 M CoSO4, 40 g L H3BO3, 0.865 g L SLS and 0.345 b-naphthol. The current efficiency for alloy deposition was 50% in the current density range 0.5-2.5 A dm2. X-ray fluorescene studies on the alloy deposit formed on steel revealed 58-75% zinc on the surface. Anodic stripping voltammetris studies were carried out on zinc-cobalt alloy films formed on glassy carbon to identify the phases formed in the alloy. Zn-Co alloy film dissolution peaks suggested the existence of b, b1 and r phases of the alloy.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
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