| abstract |
In an acidic zinc sulfate and iron sulfate electro-galvanizing bath, of which a pH value has been adjusted to under 1.5, containing iron from 20 to 90 wt. % relative to the total amount of metals capable of being electro-deposited in said acidic electro-galvanizing bath, a steel sheet is subjected to an electro-galvanizing treatment, with an electric current having a current density of from 10 to 40 A/dm2 to form on said steel sheet an electro-galvanized layer in a weight of from 1 to 50 g/m2, containing iron from 5 to 35 wt. % relative to the total weight of the electro-galvanized layer. |