Intergranular Corrosion Susceptibility of an AA5083 Al-Mg Alloy Processed by Accumulative Roll Bonding (ARB)

Abstract

Intergranular corrosion (IGC) susceptibility of an AA5083 Al-Mg alloy sheets, highly deformed by accumulative roll-bonding (ARB), was investigated. It was shown that ARB processed specimens were resistant to IGC as the mass loss was <15 mg/cm2. The degree of plastic strain during ARB processing did not affect IGC susceptibility and a value of corrosion potential. After sensitization treatment at 150°C, ARB processed specimens stayed resistant to IGC, in spite of β-phase precipitation along grain boundaries and within the structure. A high degree of deformation achieved by ARB processing, and a large amount of β-phase precipitated during the sensitization, did not cause an increase in IGC susceptibility due to favorable morphology and a distribution of β-phase in the structure.