Development of Coloring Technology on Metallic Surface using Atmospheric Pressure Plasma

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630106
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Nagaoka University of Technology
• Principal Investigator: TORU Sasaki 長岡技術科学大学, 工学(系)研究科(研究院), 准教授 (90514018)
• Co-Investigator(Kenkyū-buntansha): KIKUCHI Takashi 長岡技術科学大学, 工学研究科, 准教授 (30375521) ; HARADA Nobuhiro 長岡技術科学大学, 工学研究科, 教授 (80134849) ; NAKAMURA Takashi 国立高専機構, 釧路工業高等専門学校, 教授 (40198213)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 大気圧プラズマ / 発色加工 / 誘電体バリア放電 / 酸化物

Outline of Final Research Achievements

We demonstrate a method of metal surface coloring via oxidation by irradiating atmospheric pressure plasma. The atmospheric pressure plasma is generated via dielectric barrier discharge, which consists of an inverter power supply and electrodes covered with dielectric. A copper plate is used as a sample for surface coloration with the proposed technique. After plasma irradiation, the sample is observed, and the chemical composition ratios across its surface and depth are analyzed using X-ray photoelectron spectroscopy and glow discharge spectroscopy, respectively. We find that the surface color slightly changed from that of natural copper to that of gold after plasma irradiation. The oxygen ratio over the depth of the copper plate increases as a function of the duration of the irradiation. The chemical composition ratios of CuO, Cu2O, and Cu(OH)2 are confirmed from the XPS analysis with a Gauss–Lorentz fitting function.

Free Research Field

大気圧プラズマ