Self-assembled ferroelectric-dielectric nanocomposite films for tunable applications

Yamada, Tomoaki; Sandu, Cosmin S.; Gureev, M. Y.; Tagantsev, A. K.; Muralt, Paul; Funakubo, Hiroshi; Setter, N.

doi:10.1088/1757-899x/8/1/012010

Cited by 1 publication

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“…TiAlV6-4 (material number 3.7164/3.7165) is the most prominent titanium alloy, and widespread used in aircraft manufacturing industry, medicine, and consumer products. [1][2][3][4][5][6][7][8][9][10] Titanium and its alloys show an outstanding corrosion protection performance caused by the spontaneously formed, very thin passive oxide film covering the surface. Nevertheless, the appearance and intensity of corrosion reactions is mainly related to properties of the passivating oxide film, e.g., its thickness, composition, and conductivity.…”

Section: Introductionmentioning

confidence: 99%

Micro‐electrochemical investigation of the passive behavior of thin anodic titanium oxide films on TiAlV6‐4

Langklotz

Noeske

Schneider

2018

Materials & Corrosion

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The present work describes the passive film behavior of thin anodic oxide films on polycrystalline TiAlV6‐4. Firstly, the influence of the microstructure was addressed. Therefore, the crystallographic grain orientations of the substrate were determined by EBSD and selected grains were investigated with an electrochemical micro‐capillary cell. The barrier‐like oxide films were produced by local anodization in an acetate buffered electrolyte (pH 5.9) and investigated by electrochemical impedance spectroscopy and optical reflectometry. Second, the chemical composition of the native oxide film was determined by XPS, and the results related with the micro‐electrochemical experiments. The work shows a strong effect of the basal orientation on the electrochemical behavior. During anodic oxidation, strong electron transfer reactions occur at this orientation, while the enhanced conductivity of the oxide film is also proved by electrochemical impedance spectroscopy. Moreover, a non‐highfield conformal oxide growth and crystallization was observed on the basal plane. These effects, especially the electron conductivity, is related to the incorporation of alloying elements in the passive film.

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