Production of Zn-Ni alloy plated steel strips

摘要

Steel strips are electrogalvanized with a Zn-Ni alloy deposit having the desired nickel content in a consistent manner for a long time by placing separate Zn and Ni soluble anodes in a chloride plating bath comprising major proportions of ZnCl2 and NiCl2 in an Ni/(Zn+Ni) ratio between 0.08 and 0.20 and a total molar amount of Zn+Ni of from 1 to 4 moles per liter, and b mole per liter of KCl and a mole per liter of NH4Cl as shown in FIG. 8; passing a steel strip through the bath; and introducing currents to the soluble Zn and Ni anodes in a specific ratio given by equation (2).