1.1 This International Standard specifies the methods of integranular corrosion testing for Solutionheat-treatable aluminium alloys without protective coatings.The sensitivity of Solution heat-treatable aluminium alloys to intergranular corrosion is a function of thealloy Chemical composition, method of manufacturing, Solution heat treatment, quench treatment and artificial precipitation hardening (ageing) treatment.In the naturally aged condition, the sensitivity of solution heat-treatable aluminium alloys to intergranular corrosion is a function primarily of the rate of cooling during quenching over a critical temperature range.1.2 This International Stan