Additives of zinc-nickel alloy electroplating bath with good surface quality and plating adhesion and manufacturing method of zinc-nickel electroplated steel sheet using the same

摘要

The present invention relates to an additive of a zinc-nickel alloy electroplating bath and a method of manufacturing a zinc-nickel alloy electroplating steel sheet using the same; The purpose of the present invention is to add a zinc-nickel alloy electroplating bath which exhibits excellent surface quality and plating adhesion when plated on a steel plate, and a method of manufacturing a zinc-nickel alloy electroplating steel sheet using the zinc-nickel alloy electroplating bath containing the additive. In providing.;In order to achieve the above object, the present invention, sodium benzoate or potassium salt: 2-5% by weight, surfactant having a sulfonic group in naphthalene as a Group 1 element salt of the condensation reaction with formaldehyde: 10-25% by weight, the rest Zinc-nickel alloy electroplating with good surface quality and plating adhesion, containing water and sodium benzoate or potassium salt: surfactant in a weight ratio of 1: 1.5 to 3 with P1-toluene sulfonic acid 0.001-0.1 mol / l 0.1-4.0 ml / l of the additive was added to a chloride-based zinc-nickel alloy plating bath having an additive of 20-150 g / l of zinc ion, 0.1-15 g / l of nickel ion temperature, and 100-300 g / l of chlorine ion concentration. Adding; Electroplating the plating solution on a steel plate at a plating bath temperature of 50-70 ° C., pH 1.0-4.5, a current density of 20-180 A / dm ^2, and a relative flow rate of 0.5-2.5 m / sec. The present invention relates to a method for manufacturing a zinc-nickel alloy electroplated steel sheet including the same.