EXTRUDED PRODUCT MADE FROM ALUMINIUM ALLOY AL-MG-SI WITH IMPROVED RESISTANCE TO CORROSION

摘要

An extruded product, particularly a drawn tube made from an alloy of the 6XXX series with the following composition, in weight %: Mg: 0.4-0.7, Si: 0.4-0.7, Fe: 0.1-0.3, Zn: 0.16-0.3, Ti: 0.12-0.3, Mn0.10, Cu0.05, Cr0.05, Ni0.05. others0.05 each and 0.15 in total, remainder being aluminum, with the ratio Si/Mg between 0.9 and 1.3. The tubes are advantageously used for cabin air-conditioning systems in motor vehicles using CO2 as refrigerant gas. In such systems, the product offers an advantageous combination of good mechanical properties at operating temperatures and high resistance to perforating corrosion necessary for extended operating life without leaks.