Comparative study of Al Passivation by Different Anodizing Methods

Aluminum is one of important technological metals. While on air or in tap water aluminum is sufficiently stable, its use in polluted or sea water and on contaminated air is limited due to corrosion. In order to protect aluminum from corrosion it can be passivated by several chemical and electrochemical methods, each of whose has some advantages and some drawbacks.

The research is focused on the production of passive layers on aluminum surface by different methods of chemical passivation, electrochemical anodizing and plasma electrolytic oxydation. After aluminum specimens have been passivated by variuos methods and under various technologic regimes, their corrosion properties are tested by several electrochemical techniques (Tafel Slope measured from Linear Sweep Voltammetry tests, Cyclic Voltemmetry and Electrochemical Impedance Spectorscopy) in model corrosion media.