THE CORROSION BEHAVIOR OF Al5SiFe INTERMETALLIC PHASE
DOI:
https://doi.org/10.15421/jchemtech.v33i2.322589Keywords:
corrosion, intermetallic phase, aluminium, electrochemical studyAbstract
The present paper is devoted to the study of corrosion behavior of Al5SiFe intermetallic phase that frequently present in secondary aluminium alloys. It has been shown that in acidic chloride-containing solutions with pH 0.5–1.5 and 1.5–2.5, the mean weight losses, average corrosion rate, and corrosion depth index were at their maximum and temperature of the corrosive medium has a negligible effect on the corrosion rate. Increasing of corrosion medium`s pH up to neutral values resulted the decreasing of corrosion indicators. The lowest corrosion losses were detected in neutral sodium chloride solutions due to oxygen depolarization in cathodic processes and the presence of a protective film formed by corrosion products. This was confirmed by the presence of a passive region on the anodic potentiodynamic curve obtained as a result of the electrochemical study of the Al5SiFe intermetallic phase in a 3 % sodium chloride solution. Further increasing of the pH of solutions significantly accelerated the corrosion rate. This acceleration is apparently associated with the local destruction of the protective film by hydroxyl anions.
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