Abstract

The effect of contact thallium deposition on the corrosion rate of aluminum in hydrochloride solutions is studied. When a fraction of “metal” depolarization of aluminum corrosion is insignificant, the corrosion rate depends on the aluminum surface coverage with thallium deposit and the time. Partial inhibition coefficients, which are associated with the variations in the free-corrosion potential (K ΔE ) and in the fraction of aluminum surface area occupied by thallium deposit (K s ), are calculated. The variations of partial inhibition coefficients K s and K ΔE with the variations of thallium iodide concentration and the corrosion test time are analyzed.

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