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Korean Journal of Metals and Materials > Volume 56(3); 2018 > Article
Korean Journal of Metals and Materials 2018;56(3): 171-176. doi: https://doi.org/10.3365/KJMM.2018.56.3.171
반사도와 색 차 분석을 이용한 Cu-Zn 합금의 색 변화 고찰
정연범1, 홍성환1, 박혜진1, 김영석1, 김정태2, 이후담3, 황윤중1, 이영훈1, 김기범1
1세종대학교 나노신소재공학과
2Erich Schmid Institute of Materials Science, Austrian Academy of Science
3현대자동차
Investigation of Color Change in Cu-Zn Alloys by Reflectivity and Color Difference Analysis
Yeon Beom Jeong1, Sung Hwan Hong1, Hae Jin Park1, Young Seok Kim1, Jeong Tae Kim2, Hoo Dam Lee3, Yun Jung Hwang1, Young Hoon Lee1, Ki Buem Kim1
1Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea
2Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
3Hyundai Motors Group, Uiwang-Si 16082, Republic of Korea
Correspondence  Ki Buem Kim ,Tel: +82-2-3408-3690, Email: kbkim@sejong.ac.kr
Received: 1 November 2017;  Accepted: 27 December 2017.  Published online: 6 March 2018.
ABSTRACT
The change in reflectivity of Cu-Zn alloys was investigated with the modulation of Zn content. The reflectivity of the prepared alloys were compared with pure copper and divided into wavelength regions corresponding to blue, green, yellow, and red colors. As the amounts of Zn increased, the difference in reflectivity of the yellow region increased, and that of the red region decreased. To determine the color difference, the measured reflectivity of the alloys was transformed into a tristimulus value using the Reflectance-Tristimulus value converting equation. Then the tristmulus value was converted into the CIE L*a*b* color space. The color difference was calculated using the color difference formula of the converted L* a*b* values. When 5 at%Zn was added, the color difference value was 3.224, and it increased with increasing Zn content. As the difference in the reflectivity of the green and yellow regions increased, the b* value of the alloys increased and the a* value of the alloys decreased. In this study, the addition of Zn content to Cu alloy induced changes in the reflectivity of the green and yellow wavelength regions, which influences color differences of α-Cu solid solution alloys.
Keywords: Cu alloys, color metal, reflectivity, optical property, color difference
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