SEM/EDS characterization of laser shock peening effect on localized corrosion of Al alloy in a near natural chloride environment

摘要

This study examines the effect of laser shock peening without coating (LSPwC) on the corrosion behaviour of AA6082-T651 alloy in a near natural chloride environment. The results confirmed LSPwC as an effective method, yielding lower anodic dissolution [E_(sw) - E_(corr)), improved repassivation (E_(corr) - E_(rp)) as well as corrosion current reduction. Characterization of the corrosion attack was performed by SEM/ SEI/BEI and EDS analysis, where results confirmed crystallographic pitting as the predominant effect due to local dissolution of the Al matrix around Fe rich precipitates. Moreover, it was found that LSPwC reduces crystallographic and surface-hemispherical pitting, as well as intergranular attack.