Is superior in processability corrosion-resistant uniformity the heatproof corrosion-resistant plated steel

摘要

PURPOSE: To produce a heat- and corrosion-resistant plated member excellent in uniformity of workability and corrosion resistance by successively laminating an Ni plating layer and Zn-Ni alloy plating layers of respectively specified Ni contents by means of an acid bath and an alkaline bath, respectively, on the surface of an iron and steel sheet to respectively specified thicknesses. ;CONSTITUTION: An Ni plating layer of 0.2-10m thickness is formed on the surface of an iron and steel material by, e.g. an electroplating method by the use of a Watts bath. Subsequently, a Zn-Ni alloy layer containing 2-20%, preferably 12-15%, Ni is formed to 1-15m thickness on the layer by using an acid bath. Further, on this alloy plating layer, a Zn-Ni alloy plating layer containing 2-20%, preferably 5-10%, Ni is formed to 1-10m thickness by using an alkaline bath. It is preferable to form a chromate film on it.;COPYRIGHT: (C)1996,JPO