Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of Anodizing and Dyeing Treatments on Coloring of Al-Mg

Al-Mg합금의 컬러에 미치는 양극산화 및 착색처리의 영향

  • Bae, Sung Hwa (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Lee, Hyun Woo (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Son, Injoon (Department of Materials Science and Metallurgical Engineering, Kyungpook National University)
  • 배성화 (경북대학교 신소재공학부 금속신소재공학전공) ;
  • 이현우 (경북대학교 신소재공학부 금속신소재공학전공) ;
  • 손인준 (경북대학교 신소재공학부 금속신소재공학전공)
  • Received : 2018.11.08
  • Accepted : 2018.12.21
  • Published : 2019.02.28
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Abstract

In this study, we investigated the effects of anodizing time, dyeing treatment time, and variations in coloring concentration on the color of an AA5052 alloy processed by dye-treated anodizing. The outward color of the anodized film changed to deep red according to increases in anodizing time, dyeing treatment time, and coloring concentration; accordingly, lightness $L^*$ decreased and saturation $a^*$ and $b^*$ increased. The concentration of the dye and the UV-visible absorbance showed a nearly perfect linear relationship, allowing a quantitative analysis of the absorbed dye. Because the quantity of absorbed dye increased as anodizing time, dyeing treatment time, and coloring concentration increased, the outward color of the anodized film deepened. In addition, from the GD-OES depth profile, we found that the dye was preferentially absorbed on the surface of the porous anodized film.

Keywords

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Fig. 1. Changes in the outer color of anodic layers with changes in (a) anodizing time, (b) coloring time, and (c) dye concentration.

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Fig. 2. Variations of the brightness L* and saturation values a*, b* with the (a) anodizing time, (b) color treatment time, and (c) dye concentration.

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Fig. 3. Plots of (a) absorbance with wavelength at different dye concentrations and (b) absorbance with dye concentration at 519 nm wavelength.

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Fig. 4. Absorbance with (a) anodizing time, (b) coloring time, and (c) dye concentration. The absorbance was measured after dissolving the anodic layers in a NaOH solution.

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Fig. 5. FE-SEM images of the anodic layer surfaces after (a) anodizing, (b) coloring and (c) sealing treatments.

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Fig. 6. Compositional analyses of the color-treatedaluminum anodic layers using GD-OES.

Table 1. Amount of adsorbed dye in ppm with anodizing time, coloring time, and dye concentration.

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