Abstract
The electrochemical characteristics of N,N-bis(decaoxyethylene)octadecylamine(DOOA) and the three kinds of aromatic carbonyl compounds [cinnamaldehyde(CA), benzalacetone(BA), 2-acetonaphthone(AN)] as well as the effects of such organic additives on the electrocrystallization of zinc from acid sulfate solutions have been studied by means of various electrochemical methods and scanning electron microscope observations. DOOA and three kinds of carbonyl compounds were adsorbed on the electrode. DOOA adsorbed on the electrode as a quaternary ammonium ion strongly inhibited the electrochemical reduction of the zinc ion. BA or AN had a stronger inhibitory effect on the reduction of zinc ions than CA. Large plate-like electrodeposits of zinc (sides 3–10 μm) were obtained from acid sulfate solutions in the absence of organic additives. On the other hand, needle-like or fibrous crystals were observed on the whole surface by adding DOOA alone. Small block-like or granular crystals (sides 1–2 μm) were observed on the whole surface by adding BA or AN alone. Further, fine-grained, smooth and compact electrodeposits of zinc were obtained from acid sulfate solutions containing DOOA and BA or DOOA and AN.
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