Role of organic additives on zinc plating

Zinc can easily be deposited from alkaline cyanide and cyanide free, acid sulfate, acid chloride, fluoborate and pyrophosphate plating baths. Owing to certain desirable qualities, acid and zincate baths are widely used in industries. In the present study, the role of some individual carbonyl compounds, thiosemicarbazide and their thiosemicarbazone derivatives such as Thiosemicarbazide (TSC), Acetophenone (AcP), Cinnamaldehyde (CnA), Crotonaldehyde (CrA), Furfuraldehyde (FrA), Salcylaldehyde (SaA), Acetophenonethiosemicarbazone (ApTSCN), Cinnamaldehydethiosemicarbazone (CnTSCN), Crotonaldehydethiosemicarbazone (CrTSCN), Furfuraldehydethiosemicarbazone (FrTSCN), Salcylaldehyde thiosemicarbazone (SaTSCN) were used as the additives. The synergism of the condensed products was compared with those of the individual components. Hull cell studies, Harring and Blum cell studies were used to optimize the plating bath. Corrosion behaviour of the zinc coated mild steel specimens was also monitored.