Patent ID: 9512511
Filing Date: 2016-12-06
CPC Classification: C23C

Claim Text:
1. A galvanization method for providing a plating sheet containing less than 0.09% Si, which is an annealed cold-rolled steel sheet, and which is configured to avoid non-plating defects, the method comprising: an alkali degreasing treatment of the steel sheet; a pickling treatment of the alkali degreased steel sheet in a sulfuric acid aqueous solution; electroplating the pickled steel sheet with Ni in a sulfate ion containing plating bath; preparing the electroplated steel sheet by heating said electroplated steel sheet in a reducing atmosphere to a sheet temperature between about 430° C. and about 500° C. at a heating rate between 20° C./sec and 50° C./sec; and hot-dip plating the prepared steel sheet in a galvanization bath comprising between about 0.05% and about 1.0% Al, wherein an amount of Ni applied during the electroplating is between about 0.05 g/m