1991-02-01

Development of Pitting Corrosion Resistant Condenser with Zinc-Arc-Spray Extruded Multi-Cavity Tubing 910592

We have developed a highly corrosion-resistant serpentine type condenser which is characterized by its manufacturing process that zinc is coated on the surface of a multi-cavity extruded tubing at the rate of 5-20 g/m2 by arc spray, and then, thus prepared tubing and corrugated fin stocks are brazed by the conventional Nocolok brazing process (Herein after this is referred to as ZAS NB process). By this brazing process as well as conventional flux brazing (FB) process, a highly pitting corrosion-resistant zinc diffusion layer is formed on the surface of the tubing at the time when brazing is operating. This newly developed method achieved improvements in productivity and quality of product.

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