Effect of anodizing conditions on the cell morphology of anodic films on AA2024‐T3 alloy. (14th September 2018)

• Record Type: Journal Article
• Authors: Torrescano‐Alvarez, Jeanette M.; Curioni, Michele; Zhou, Xiaorong; Skeldon, Peter
• Other Names: Terryn Herman guestEditor.
• Is Part Of: Surface and interface analysis. Volume 51:Number 12(2019)
• Page Start: 1135
• Page End: 1143
• Publication Date: 2018-09-14
• Subjects: AA2024‐T3 aluminium alloy -- hard anodizing -- oxygen evolution -- porous anodic film -- sulfuric acid anodizing -- voltage‐time response; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Thin films -- Periodicals; 541.33
• DOI: 10.1002/sia.6562
• Languages: English
• ISSNs: 0142-2421

Abstract

Abstract : The effects of applied current density, anodizing time, and electrolyte temperature on the cell and pore morphology of anodic films and the voltage‐time response obtained during galvanostatic anodizing of AA2024‐T3 alloy in sulphuric acid electrolytes have been studied. Scanning electron microscopy was employed to observe the film morphology. Sponge‐like porous structure was promoted by anodizing at relatively low current density and high electrolyte temperature. In contrast, linear porous structure was favoured under the converse conditions. Intermediate conditions resulted in films containing either sequential layers of the 2 morphologies or a morphology incorporating features of the 2 types; such conditions were associated with anodizing voltages in the range 25 to 35 V. The reasons for the morphological differences are proposed to be due to interactions between film growth stresses and stresses arising from oxygen evolution on the development of the alumina cells.