Effects of Rolling Deformation Rate and Heat Treatment on Corrosion Resistance of Al-1Li-0.05Sc Alloy
Effects of rolling deformation rate and aging process on corrosion resistance of Al-1Li-0.05Sc alloy were investigated.OM results indicate that the corrosion is characterized by pitting corrosion.The electrochemical perfor-mance tests and TEM results reveal that the 70%deformation are crushed into small angle grain boundary under severe deformation amounts due to the high angle grain boundary generated by recovery,achiving desirable corrosion resis-tance.After peak aging treatment at 255℃,a large amount of second phase is precipitated in the alloy,improving the mechanical properties and reducing the corrosion resistance instead.530℃×24 h + 285℃×1.5 h aging is the optimal heat treatment,where the mechanical properties of the alloy are greatly improved,and optimal corrosion resistance is obtained after 50%rolling deformation.
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