Optimization and Control of Coating Process Through Air Knife System to Reduce Zinc Consumption (M.Sc. Thesis)

By: Material type: TextTextLanguage: English Publication details: Karachi : Institute of Materials Sciences and Research Pakistan Steel, 1995Description: vpSubject(s): DDC classification:
  • 671.73 HUS
Summary: Abstract: Coating uniformity has always been a primary goal for high quality galvanized steel. The main sources of losses of zinc are ash and dross formation , which can be controlled by maintaining a oxygen concentration from 100 ppm to 1000 ppm in a properly design sealing box. Good antipowdering characteristics and beautiful spangles can be obtained by controlling the aluminum and lead contents in the zinc bath. Highly irregular and thick coating is obtained with high silicon and phosphorus content in the base metal. Pressure, line speed, nozzle strip distance, nozzle angle and nozzle slit gap also contributed to get the uniformity at lower coating weight. It is possible to get the lower coating weight upto 50 gm/m²/side. by controlling the air knife pressure, line speed and nozzle to strip distance. .
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Abstract:

Coating uniformity has always been a primary goal for high quality galvanized steel. The main sources of losses of zinc are ash and dross formation , which can be controlled by maintaining a oxygen concentration from 100 ppm to 1000 ppm in a properly design sealing box. Good antipowdering characteristics and beautiful spangles can be obtained by controlling the aluminum and lead contents in the zinc bath. Highly irregular and thick coating is obtained with high silicon and phosphorus content in the base metal. Pressure, line speed, nozzle strip distance, nozzle angle and nozzle slit gap also contributed to get the uniformity at lower coating weight. It is possible to get the lower coating weight upto 50 gm/m²/side. by controlling the air knife pressure, line speed and nozzle to strip
distance. .