METHOD FOR PRODUCING HOT-DIP GALVANIZED STEEL SHEET

The purpose of the present invention is to provide a method for producing a hot-dip galvanized steel sheet which makes it possible to achieve high plating adhesion and a good plating appearance even when hot-dip galvanization is performed on a steel sheet containing 0.2 mass% or more of Si. When performing hot-dip galvanization on a steel sheet containing 0.2 mass% or more of Si using a sequential hot-dip galvanization device comprising an annealing furnace in which a heating zone, a soaking zone, and a cooling zone are provided side by side in this order, a snout which is adjacent to the cooling zone, and hot-dip galvanization equipment, a nitrogen-hydrogen mixture gas that contains water and that satisfies formula (1) is introduced into the region downstream from the soaking zone, a gas nozzle is provided along the entire circumference of the inner wall of the snout, nitrogen or the nitrogen-hydrogen mixture gas is downwardly introduced from the gas nozzle along the inner wall, and the dew point inside the snout is controlled to -50 to -35ºC. (1): 158