Non-uniform Microdistribution of Zinc-Nickel Alloy Electrodeposits Its Effect on the Protective Properties of the Coatings

摘要

The composition of Zn-Ni coatings may be non-uniform on a microscale. With the average Nicontent of 12 to 14 %, its total value may vary in the alloy deposited on a microrough surfacefrom 4% on micropeaks up to more than 20% in microrecesses. These variations result in appreciablydecreased protective action of the coating. Bath composition and plating conditions arerecommended that minimize local variations in the composition of the coatings and allow theimprovement of their protective values.