Electrochemical noise measurements for the determination of the effectiveness of new corrosion protection layers on aluminium and magnesium

摘要

The corrosion behaviour of the aluminium alloy AlMgl and of the magnesium alloy AM60 have been investigated by electrochemical noise measurements in chloride and sulfate solutions. It should be proved, whether protecting layers based on self assembling molecules, which have been adsorbed on the samples before the electrochemical noise measurements, could inhibit pitting corrosion. The measurements do show, that several systems have an inhibitive effect, others not. Potentiostatic tests in combination with the measuements of the current noise are useful for a quick determination of the break through potential.