Effects of Sn and In Added in The Concentrated Alkaline Zincate Bath on The Inhibition of Dendritic Crystal

Abstract

Zinc deposits obtained from the concentrated alkaline zincate bath always showed dendritic crystal. Whereas the bath added to Sn（IV）ion and/or In（III）ion inhibited dendritic crystal formation, the deposit obtained from the bath added to Sn（IV）ion showed block-like crystal formation. The deposit obtained from the bath containing In（III）ion showed a hexagonal, disc-shaped structure and steps on the edge of crystals, which led to the preferred orientation with the {10•2}, {10•3}, and {0•04} plane.