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Abstract

The traditional copper radiators and heaters in automobiles are being replaced by more lightweight versions made of aluminium. Since different halide fluxes are used in the manufacture of the two types of radiator or heater, it is possible for the coolant to be contaminated by more than one halide when the two types of heat exchanger are used in the ·same system. This may give rise to pitting corrosion of the aluminium. Potentiostatic experiments have enab(ed the critical pitting potential of aluminium in 50% ethanediol solution to be determined to within 5 m V and it has been shown that the Ep value becomes less noble with increase in halide ion concentration. The pitting potential of aluminium in solution containing thefluoride ion has bee:nfound to be more noble than expected.

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Critical pitting potential of aluminium in automobile cooling systems

Abstract

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References