Process for manufacturing galvanized steel sheet by nickel pre-coating method.

摘要

Process for manufacturing a galvanized steel sheet, comprising steps of coating a steel sheet with nickel in an amount of from 0.2 to 2 g/m<2>, heating the steel sheet thus coated to a temperature within the range of from 420 DEG C to 500 DEG C in a non-oxidative atmosphere, and dipping the nickel coated steel sheet into a molten zinc bath containing aluminum at a content of from 0.1 to 1% without contact with air, wherein the steel sheet is dipped into the molten zinc bath within 15 seconds after the temperature of the steel sheet exceeds 350 DEG C in the heating step, and apparatus for performing the process. The galvanized steel sheet has superior surface appearance and coating adherence. <IMAGE>