Regensburg 2022 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 32: Nanomaterials: Surface Effects

MM 32.1: Talk

Thursday, September 8, 2022, 11:45–12:00, H45

Effects of post anodization processes on the surface stability of anodic aluminum oxide — •Lydia Daum, Stefan Ostendorp, and Gerhard Wilde — Westfälische-Wilhelms-Universität, Münster, Germany

The wide spectrum of different aluminum alloys enables the industry an economically advantageous material with the desired mechanical properties. In contrast to high-purity aluminum, the formation of a thin protective alumina layer is suppressed, which leads to a lower chemical corrosion resistance. Here anodization and the generation of anodic aluminum oxides (AAOs) are mandatory to obtain a necessary protective coating. The participating alloying elements are obstacles for mechanical stresses inside the AAOs which promotes the formation of nano- and microcracks at the surface. Thus, chemical attacks of the aluminum alloy are more favorable.

The use of post anodization processes will densify the pores and flatten the surface, which enhances the chemical resistance. A combination of nanoindentation studies and electron microscopy measurements are analyzing the surface stability of AAOs. By varying the methods in duration and medium, different wear, hardness and ductility characteristics are visible.