The Effect of Air Knife Wiping Speed on Galvanized Coating Weight and Thickness

An important factor of wiping parameters-wiping speed was controlled precisely in the paper to study its effect on galvanized coating weight and thickness.The experiment was conducted by a hot dipping process simulator, the experimental steel was immersed in a zinc bath of Zn-0.24Al (vol%) at stable temperature of 460C for 3.5s, with fixed atmosphere of 10H 2 /90N 2 (vol%), dew point of -60C.The wiping speed was conducted from 300 to 700 mm/s, the coating weight was decreased from 66.55 to 56.19 µm then increased to 77.57µm, the thickness was in the trend decreased from 9.17 to 7.84µm then increased to 13.18µm.The minimum value was both when the wiping speed was at 500 mm/s.