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http://dx.doi.org/10.5695/JKISE.2009.42.6.260

Formation of Anodic Oxide Films on As-Cast and Machined Surfaces of Al-Si-Cu Casting Alloy  

Moon, Sung-Mo (Korea Institute of Materials Science)
Nam, Yoon-Kyung (Korea Institute of Materials Science)
Yang, Cheol-Nam (Korea Institute of Materials Science)
Jeong, Yong-Soo (Korea Institute of Materials Science)
Publication Information
Journal of the Korean institute of surface engineering / v.42, no.6, 2009 , pp. 260-266 More about this Journal
Abstract
The anodic oxidation behaviour of a cast component of AC2A Al alloy with machined surface and ascast surface was investigated in sulfuric acid solution. The anodized specimen showed relatively uniform and thick anodic oxide films on the as-cast surface, while non-uniform and very thin oxide films were formed on the machined surface. Non-anodized as-cast surface was observed to be covered with thick oxide scales and showed a number of second-phase particles containing Si, while non-anodized machined surface showed no oxide scales and relatively very small number of Si particles. Thus, the very limited growth of anodic oxide films on the as-cast surface was attributed to the presence of thick oxide scales and Si-containing second-phase particles on its surface.
Keywords
Anodic oxide film; Al casting alloy; Anodizing; cast surface; Machined surface;
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