AL OR AL ALLOY FIN MATERIAL SUBJECTED TO HYDROPHILIC SURFACE TREATMENT AND EXCELLENT IN WATER DROPPING ABILITY, ITS PRODUCTION AND CORE OF HEAT EXCHANGER

摘要

PURPOSE: To produce an Al fin material subjected to hydrophilic surface treatment and excellent in water dropping ability by forming a hydrophilic coating film having striped waviness on the surface of an Al substrate and regulating the pitch and height of the waviness ;CONSTITUTION: A hydrophilic coating film 2 having about 2.5μm thickness is formed on the surface of an Al or Al alloy substrate 1 to produce an Al or Al alloy fin material subjected to hydrophilic surface treatment. At this time, striped waviness is formed on the surface of the hydrophilic coating film 2 and the pitch (p) and height (h) of the waviness are regulated to 1-8mm and 0.1-3μ, respectively. The objective Al or Al alloy fin material maintaining satisfactory water dropping ability over a long period of time and having improved durability is obtd.;COPYRIGHT: (C)1995,JPO