Additive for electroplating of zinc-nickel alloy and method for manufacturing zinc-nickel alloy electroplated steel sheet

摘要

The present invention relates to a zinc-nickel alloy electroplating additive excellent in surface gloss and whiteness of a zinc-nickel alloy electroplating layer and capable of uniformizing the roughness of a plating layer, and an electroplating bath to which the zinc-It is an object of the present invention to provide a method of manufacturing an electroplated steel sheet.;The present invention relates to a zinc-nickel alloy electroplating additive which comprises 10 to 20% by weight of saccharin sodium or saccharin potassium, 2 to 10% by weight of sodium benzoate or potassium benzoate, and 40 to 80% by weight of water To 8 to 20% by weight of a surfactant, which is a salt of the condensation product of sulfonic acid naphthalene and formaldehyde, so that the weight ratio of the saccharinic salt to benzoic acid to the surfactant is 2-5: 1: 1.5-3 Nickel alloy electroplating composition and a method of manufacturing a zinc-nickel alloy electroplated steel sheet using the same.;The present invention has an effect of providing a zinc-nickel alloy electroplated steel sheet in which the surface roughness of the plating layer is finely uniform and excellent in surface gloss and whiteness.