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REVIEW ON THE INTERGRANULAR CORROSION AND EXFOLIATION CORROSION OF ALUMINUM ALLOYS

Jingxin Su

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Abstract

Studies on intergranular corrosion and exfoliation corrosion of 2xxx,7xxx series aluminum alloys and Al-Li alloys are reviewed.For intergranular corrosion,composition and distribution of grain boundary precipitates,and the difference of their breakdown potentials with that of the matrix are most concerned,effect of heat treatment on corrosion resistance of alloys and local corrosion kinetics are studied.For exfoliation corrosion,the effect of grain shape and wedging on the corrosion process are concerned.And fast,reliable and nondestructive testing methods such as EIS are in progress.

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What this paper is about

Studies on intergranular corrosion and exfoliation corrosion of 2xxx,7xxx series aluminum alloys and Al-Li alloys are reviewed.For intergranular corrosion,composition and distribution of grain boundary precipitates,and the difference of their breakdown potentials with that of the matrix are most concerned,effect of heat treatment on corrosion resistance of alloys and local corrosion kinetics are studied.For exfoliation corrosion,the effect of grain shape and wedging on the corrosion process are concerned.And fast,reliable and nondestructive testing methods such as EIS are in progress.

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Available abstract

Studies on intergranular corrosion and exfoliation corrosion of 2xxx,7xxx series aluminum alloys and Al-Li alloys are reviewed.For intergranular corrosion,composition and distribution of grain boundary precipitates,and the difference of their breakdown potentials with that of the matrix are most concerned,effect of heat treatment on corrosion resistance of alloys and local corrosion kinetics are studied.For exfoliation corrosion,the effect of grain shape and wedging on the corrosion process are concerned.And fast,reliable and nondestructive testing methods such as EIS are in progress.

Key concepts: Intergranular corrosion, Materials science, Corrosion, Metallurgy, Grain boundary, Aluminium, Microstructure

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