Photo-Electrochemical Investigation of Anodic Oxide Films on cast Ti-Mo Alloys. I. Anodic behaviour and effect of Alloy Composition

Carmelo Sunseri, Salvatore Piazza, Guastaldi, Oliveira

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Abstract

The anodic behaviour of cast Ti–Mo alloys, having different Mo contents (6–20 wt.%), was investigatedin acidic and neutral aerated aqueous solutions. All sample showed a valve-metal behaviour, owing toformation and thickening of barrier-type anodic oxides displaying interference colours. Growth kineticsof passive films is influenced by both anodizing electrolyte and composition of the starting alloy. Thislast parameter was found to change also the solid-state properties of the films, explored by photoelectrochemicaland impedance spectroscopy experiments. Thicker films (Uf = 8 V/MSE) grown on alloys richer inMo showed more resistive character and a photocurrent sign inversion under negative bias, that revealedan insulating character, whereas corresponding films grown on alloys with lower Mo content, as well asthinner films, behaved as n-type semiconductors. Results are discussed in terms of formation of a mixedTi–Mo oxide phase.
Lingua originaleEnglish
Numero di pagine8
RivistaElectrochimica Acta
Volume54
Stato di pubblicazionePublished - 2009

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Oxide films
Chemical analysis
Oxides
Anodic oxidation
Photocurrents
Thick films
Electrolytes
Metals
Spectroscopy
Semiconductor materials
Color
Experiments

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Cita questo

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title = "Photo-Electrochemical Investigation of Anodic Oxide Films on cast Ti-Mo Alloys. I. Anodic behaviour and effect of Alloy Composition",
abstract = "The anodic behaviour of cast Ti–Mo alloys, having different Mo contents (6–20 wt.{\%}), was investigatedin acidic and neutral aerated aqueous solutions. All sample showed a valve-metal behaviour, owing toformation and thickening of barrier-type anodic oxides displaying interference colours. Growth kineticsof passive films is influenced by both anodizing electrolyte and composition of the starting alloy. Thislast parameter was found to change also the solid-state properties of the films, explored by photoelectrochemicaland impedance spectroscopy experiments. Thicker films (Uf = 8 V/MSE) grown on alloys richer inMo showed more resistive character and a photocurrent sign inversion under negative bias, that revealedan insulating character, whereas corresponding films grown on alloys with lower Mo content, as well asthinner films, behaved as n-type semiconductors. Results are discussed in terms of formation of a mixedTi–Mo oxide phase.",
keywords = "Anodic films, Molybdenum, Photocurrent spectroscopy, Titanium alloys",
author = "Carmelo Sunseri and Salvatore Piazza and Guastaldi and Oliveira",
year = "2009",
language = "English",
volume = "54",
journal = "Electrochimica Acta",
issn = "0013-4686",
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TY - JOUR

T1 - Photo-Electrochemical Investigation of Anodic Oxide Films on cast Ti-Mo Alloys. I. Anodic behaviour and effect of Alloy Composition

AU - Sunseri, Carmelo

AU - Piazza, Salvatore

AU - Guastaldi, null

AU - Oliveira, null

PY - 2009

Y1 - 2009

N2 - The anodic behaviour of cast Ti–Mo alloys, having different Mo contents (6–20 wt.%), was investigatedin acidic and neutral aerated aqueous solutions. All sample showed a valve-metal behaviour, owing toformation and thickening of barrier-type anodic oxides displaying interference colours. Growth kineticsof passive films is influenced by both anodizing electrolyte and composition of the starting alloy. Thislast parameter was found to change also the solid-state properties of the films, explored by photoelectrochemicaland impedance spectroscopy experiments. Thicker films (Uf = 8 V/MSE) grown on alloys richer inMo showed more resistive character and a photocurrent sign inversion under negative bias, that revealedan insulating character, whereas corresponding films grown on alloys with lower Mo content, as well asthinner films, behaved as n-type semiconductors. Results are discussed in terms of formation of a mixedTi–Mo oxide phase.

AB - The anodic behaviour of cast Ti–Mo alloys, having different Mo contents (6–20 wt.%), was investigatedin acidic and neutral aerated aqueous solutions. All sample showed a valve-metal behaviour, owing toformation and thickening of barrier-type anodic oxides displaying interference colours. Growth kineticsof passive films is influenced by both anodizing electrolyte and composition of the starting alloy. Thislast parameter was found to change also the solid-state properties of the films, explored by photoelectrochemicaland impedance spectroscopy experiments. Thicker films (Uf = 8 V/MSE) grown on alloys richer inMo showed more resistive character and a photocurrent sign inversion under negative bias, that revealedan insulating character, whereas corresponding films grown on alloys with lower Mo content, as well asthinner films, behaved as n-type semiconductors. Results are discussed in terms of formation of a mixedTi–Mo oxide phase.

KW - Anodic films

KW - Molybdenum

KW - Photocurrent spectroscopy

KW - Titanium alloys

UR - http://hdl.handle.net/10447/61398

M3 - Article

VL - 54

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -