Process od desensitization to exfoliating corrosion of lithium-containing aluminium alloys, resulting simultaneously in a high mechanical resistance and in good damage limitation

摘要

1. A process for the heat treatment of Al alloys containing Li to improve their resistance to exfoliation corrosion while retaining a high level of mechanical strength and good resistance to damage characterised in that the final ageing operation is carried out in the following range of temperatures T (in degree C) and times t (in hours) : t = 24 X 5 exp ((150-T)/30) t = 80 X 5 exp ((150-T)/30) with : T = 160 degrees C for Mg = 2% T = 160 degrees C-5 (2-% Mg) degrees C for 1 = Mg = 2% T = 155 degrees C for Mg = 1%.