| 摘要 |
Provided is a method for producing an aluminum alloy heat exchanger formed by applying a coating material, which is obtained by mixing an Si powder, a flux powder, and a binder, to the surface of a flat, multi-hole coolant tube formed from an aluminum alloy extruded material, attaching an aluminum alloy bare fin and brazing the resulting product. The coolant tube is formed from the extruded material of an aluminum alloy that comprises 0.5 to 1.7% of Mn, less than 0.10% of Si, and less than 0.10% of Cu, with the remainder being Al and inevitable impurities. The fin is a corrugated fin obtained by molding an Al-Mn-Zn alloy material. The coating material is obtained by mixing an Si powder, a compound flux powder containing Zn, a Zn-free compound flux powder, and a binder. The amount of the Si powder applied is 1 to 4 g/m2. The potential is the highest in a deep section of the coolant tube of the heat exchanger produced by means of brazing, and the potential decreases in the order of the coolant tube surface, a fin joint fillet, and the fin. |
