The effect of surface roughness on glossiness and surface color for anodized 5052 aluminum alloy plates were investigated. The surface roughness of aluminum alloy plate was controlled by processing of shot blasting to satisfy the condition of arithmetical mean roughness,
Ra, less than 1.0 μm. The specimens with several different conditions were prepared: shot blasting, anodizing after blasting, and, in addition, it dyed it to red, green and blue respectively.
CIELAB (
L*a*b* color system) was applied to the surface color evaluation method. The results of experiments, the glossiness value,
Gs (60°), increased as decreasing
Ra. The lightness,
L*, decreased as decreasing
Ra. The hue angle,
hab, of the anodized surface changed into the green direction. The
a,
b chroma,
C*
ab, decreased as decreasing
Ra of the anodizing red and blue specimens. However, the
a,
b chroma,
C*
ab, increased as decreasing
Ra of the anodizing green specimen. This was caused by the fact that the hue angle,
hab, changes into the green direction by anodizing.
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