Corrosion behavior of 5-26wt% Ni-Zn electrodeposited alloys was investigated by means of dipping electrochmical polarization measurement and galvanic coupling test. The weight loss and anodic polarization curve of coatings were measured by means of dipping and polarization measurement respectively. The galvanic protection effect of alloy coatings was measured by galvanic coupling test and the surface morpholgy of coatings was observed after corrosion testing. Our findings support thous of previous investigations showing that ${gamma}$single phase coatings, while galvanic pprotection effect of dual phase coatings improved in comparison with ${gamma}$single phase coating. The formation of colony in coating of ${gamma}$and η+${gamma}$ dual phsae caused the localized corrsion and increased the corrosion rate of the Ni-Zn coating.