Discovery of Reversible Switching of Coloration of Passive Layers on Titanium

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• 作者：Gregory Jerkiewicz ; Baodong Zhao ; Sabahudin Hrapovic ; Ben Li Luan
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：March 11, 2008
• 年：2008
• 卷：20
• 期：5
• 页码：1877 - 1880
• 全文大小：337K
• 年卷期：v.20,no.5(March 11, 2008)
• ISSN：1520-5002

文摘

Colored passive layers on Ti can be prepared by electrochemical means and their coloration can be switched reversibly between several colors by increasing or decreasing the AC voltage (V_AC) in a stepwise manner. The coloration, which originates from iridescence, is directly related to the passive layer’s thickness (d) achieved at each V_AC value. Two concurrently occurring processes, the passive layer growth and passive layer dissolution, control the passive layer thickness. At a given AC voltage, the passive layer reaches a steady-state thickness at which the growth rate (υ_growth) equals the dissolution rate (υ_diss). An increase or decrease in V_AC modifies the values of υ_growth and υ_diss until a new steady-state thickness, and new coloration, is achieved.