Luminescence, breakdown and colouring of anodic oxide films on aluminium

Rational Design of Ultra-Short Anodic Alumina Nanotubes by Short-Time Pulse Anodization

“…HA conducted at high current density is accompanied by a large evolution of heat as compared to MA. The extensive heat generation can cause the dissolution of aluminum oxide in the acid electrolyte and thus enhance the ionic flow across the oxide barrier layer at the pore bottom, which will eventually lead to electric breakdown [19,20]. Pulse anodization is an effective method to dissipate the Joule's heat by introducing a MA step after HA [21][22][23].…”

Impurity-defect structure of anodic aluminum oxide produced by two-sided anodizing in tartaric acid

“…It is assumed that during electrochemical oxidation of aluminum, the main process of forming a layer of porous aluminum oxide is accompanied by the entry of aluminum into solution and the escape of Al 3+ ions in the form of complex compounds with anions of the electrolyte acids [5]. The resulting anion complexes of aluminum can become embedded in the structure of the porous alumina and be retained in that state [6][7][8]. Along with electrochemical oxidation of aluminum, however, partial oxidation of organic anions can also occur.…”

Luminescence properties of oxide films formed by anodization of aluminum in 12-tungstophosphoric acid

“…Galvanoluminescence (GL) is a common name for light appearing at one of the electrodes in an electrolytic solution during anodization [11,12]. Since the discovery of GL at the end of XIX century, it has been investigated by many authors, but explanations of the nature and the mechanism of GL are still not completely resolved because of complex environment and many experimental parameters that dictate the intensity and spectral distribution of GL [13].…”