Abstract
A study on color and far-infrared emissivity of anodic oxide film of strip cast Al–Mn based alloy was conducted. Sulfuric anodized film of strip cast Al–2.0%Mn alloy containing fine Al6Mn precipitates reveals black color. These precipitates do not oxidized during anodizing and exist as metallic Al6Mn phase in anodic film. A superior far-infrared emissivity was recognized on the black anodic film of strip cast Al–1.8%Mn alloy. The anodic film has very complex structure with irregular pore as the result of Al6Mn precipitates. Film hardness and resistance to heat crack was found also superior. A good radiation property of the black anodized film was confirmed. Application of far-infrared radiation contributes to effective heating and to saving energy.
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