Abstract
In the present paper, the authors studied the effect of thickness, cold working and preheating of base metal. Two different methods were used to coat the steel sheet of 0.2∼1.2 mm thickness namely; the single bath method and double bath method. The results obtained were as follows: (1) The formation of the alloy layer is affected by thickness of the sheet. It is due particularly to the local temperature drop adjacent to the base metal. (2) Cold working of the base metal has no effect on the alloy formation. The internal strain is removed during the dipping process and an annealed structure is obtained. (3) The alloy layer can be formed thicker by the preheating effect of double bath method but its effect is practically the same if the duration of the preheating treatment varies. The authors have tried to study the experimental results statistically and also the mechanism of alloy layer formation are considered.
