PRODUCTION OF ALUMINUM HEAT EXCHANGER

摘要

PURPOSE:To stabilize the deposition rate of Zn and to improve corrosion resistance by using an extruded tube contg. a specific amt. of Fe, Cu and pure Al. CONSTITUTION:Zn is deposited at 5-15g/m<2> by one time of chemical treatment on the surface of an extruded tube 1 consisting of 0.15-0.5wt% Fe, 0.005- 0.02wt% Cu and the balance pure Al of 99.3-99.7% purity and unavoidable impurities. Fins 2 are combined with the extruded tube deposited with the Zn and thereafter a flux is coated on the surface thereof and the assembly is heated and brazed in an inert gaseous atmosphere by using an Al-Si brazing material.