Abstract
The effect of Al3+ on the hydrogen permeation behaviour of steel during cyclic corrosion was investigated under AlCl3 droplets with varying Al3+ concentrations. The permeated hydrogen during the corrosion process was measured by electrochemical techniques. The observation of corrosion morphology and analysis of corrosion products were performed in the corrosion tests. It was found that Al3+ presented a significant effect on corrosion morphology and hydrogen entry into steel. The amount of permeated hydrogen through steel increased with increasing Al3+ concentrations. The precipitation of Al species under salt droplets, the localized acidification under rust layers, and the hygroscopic property of AlCl3 were considered contributing factors enhancing the hydrogen evolution and absorption into steel during wet-dry cyclic corrosion.
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