corrosion behavior of Al-Co-Ti alloy system

What is it about?

This paper aims to investigate ternary Al-Co-Ti alloy system with various Co compositions. The effect of the addition of 5, 10, 15,20, 25, 30 per cent Co and 2 per cent Ti on the structural evolution shows that both intermetallic compounds formation and structure morphology are relatedto corrosion resistance at the as-elaborated state as after subsequent heat treatment at 500°C during short time. The substitution of Co has an important effect on the corrosion resistance and plays a role for the formationof the passive film.

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Why is it important?

The aim of this work is to establish the influence of the addition of Co and Ti on structural change and related corrosion behavior improvement in Al. Particular attention is accorded to Al-15 per cent Co-2 per cent Ti alloy. Among the studied alloys with different Co contents, a precise composition of 15 per cent Co and 2 per cent Ti appears to have interesting electrochemical characteristics regarding the corrosion potential, the corrosion current and particularly the corrosion rate, which is very small when compared to that of other alloys, as well in the as-solidified state than after heat treatment. This composition is located halfway between the stainless steel 304 and the Al-Fe and Al-Co-Ce alloys.