TY - JOUR
T1 - Coloration by zinc-nickel composite films electrodeposited from a chloride solution
AU - Nakano, Hiroaki
AU - Kataoka, Syota
AU - Oue, Satoshi
AU - Kobayashi, Shigeo
PY - 2014
Y1 - 2014
N2 - Zn-Ni composite films were electrodeposited under coulostatic (515-5 145 C·m-2) and galvanostatic (5 A·m-2) conditions onto brass plates with a Ni precoating in an unagitated chloride solution at 23°C to investigate the color and structure of the deposited films. The chromaticity of the deposited Zn-Ni composite films changed in a clockwise direction in each quadrant of the a*b* diagram of the L*a*b* color space with increasing amount of charge. The deposited films contained S, Zn, and Ni, and their content decreased in the order of S > Zn > Ni. X-ray photoelectron spectroscopy revealed that the deposited films were primarily composed of ZnS, ZnO, and Ni and contained small amounts of Zn(OH)2 and Zn. The color of the deposited films is attributed to interference of light, and the index of refraction of the deposited films composed of ZnS, ZnO, and Ni is assumed to be large. When Ni was excluded from the electrolytic solution, ZnS did not codeposit and the amount of Zn deposited in the metallic state increased. This result suggests that the Ni deposition induces the codeposition of ZnS.
AB - Zn-Ni composite films were electrodeposited under coulostatic (515-5 145 C·m-2) and galvanostatic (5 A·m-2) conditions onto brass plates with a Ni precoating in an unagitated chloride solution at 23°C to investigate the color and structure of the deposited films. The chromaticity of the deposited Zn-Ni composite films changed in a clockwise direction in each quadrant of the a*b* diagram of the L*a*b* color space with increasing amount of charge. The deposited films contained S, Zn, and Ni, and their content decreased in the order of S > Zn > Ni. X-ray photoelectron spectroscopy revealed that the deposited films were primarily composed of ZnS, ZnO, and Ni and contained small amounts of Zn(OH)2 and Zn. The color of the deposited films is attributed to interference of light, and the index of refraction of the deposited films composed of ZnS, ZnO, and Ni is assumed to be large. When Ni was excluded from the electrolytic solution, ZnS did not codeposit and the amount of Zn deposited in the metallic state increased. This result suggests that the Ni deposition induces the codeposition of ZnS.
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U2 - 10.2355/isijinternational.54.1661
DO - 10.2355/isijinternational.54.1661
M3 - Article
AN - SCOPUS:84906730063
VL - 54
SP - 1661
EP - 1666
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 7
ER -