Corrosion characterization of titanium alloys by electrochemical techniques

Assis, S. L.; Wolynec, Stephan; Costa, Isolda

doi:10.1016/j.electacta.2005.02.121

Cited by 654 publications

(354 citation statements)

References 19 publications

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“…Results similar to those found in the present work were observed by Assis 30 , which investigated the corrosion resistance of titanium alloy containing 13% of neobium and 13% of zirconium in a hydrogen peroxide-containing environment. For this author, the formation of passive porous layer on the surface of the alloy allows to conclude that the resistance to corrosion can be explained by the type of layer or barrier that forms on the surface of the alloy.…”

Section: Discussionsupporting

confidence: 90%

Study of the Vickers hardness and corrosion behavior of experimental Ti-Mo alloy in dental office bleaching agents

Felipe¹,

Nakazato²,

Dutra³

et al. 2017

Arch Health Invest

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At present, titanium and its alloys stand out for their mechanical and biological properties. Vickers hardness and the effect of 15%, 22% and 35% hydrogen peroxide (H2O2) on Ti-10Mo alloy corrosion were evaluated. A conventional double-walled glass cell was used for thermostatization. As reference electrode was used the Ag/AgCl (s)/KClsat and as auxiliary electrode graphite stick. The work electrodes consisted of Ti-10Mo cylinders embedded in polyethylene, with electrical contact by brass wire and silver paint on one end. The electrolyte used was H2O2 in concentrations of 15%, 22% and 35% and potentiodynamic measurements were recorded. The Vickers hardness was evaluated before the treatment using Vickers penetrator under load of 1000g and dwell time of 10s / measurement separately. The results showed an increase in the corrosion values in direct relation with the increase of the H2O2 concentration. At 35% concentration, at constant current of ~ 1.0V the alloy did not passivate, characterizing high corrosion rate. At the concentrations of 15% and 22% the results showed a tendency to pseudopassivation, with release of TiO2 and part of the product of the corrosion becoming semi-adherent to the surface of the working electrode and another part passing through the middle, characterizing intermediate corrosion velocity. It was concluded that higher H2O2concentrations produced higher electrochemical corrosion.Descriptors: Titanium; Alloys; Surface Properties; Corrosion; Tooth Bleaching Agents.

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Section: Discussionsupporting

confidence: 90%

Study of the Vickers hardness and corrosion behavior of experimental Ti-Mo alloy in dental office bleaching agents

Felipe¹,

Nakazato²,

Dutra³

et al. 2017

Arch Health Invest

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“…The growth of an oxide layer via plasma electrolytic oxidation, local breakdown with a small spark, and the subsequent oxygen gas evolution resulted in the formation of this complicated structure [42,43]. The EIS is a very useful method for the determination of the corrosion resistance of the Ti-13Nb-13Zr alloy [30,[44][45][46][47][48]. Though Nyquist plots are relatively featureless, the Bode plots are more indicative for the changes in the electrochemical characteristics of the system during aging.…”

Section: Resultsmentioning

confidence: 99%

Anodic oxidation of the Ti–13Nb–13Zr alloy

Mosiałek

Nawrat

Szyk-Warszyńska

et al. 2014

J Solid State Electrochem

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This work presents the results of the investigations on the electropolishing and anodic oxidation of the Ti-13Nb-13Zr titanium alloy. Electropolishing was conducted in the solution containing ammonium fluoride and sulfuric acid, whereas the solution of phosphoric acid was used for anodic oxidation of the alloy. The influence of electropolishing and anodization process parameters on the texture (scanning electron microscopy (SEM)) and chemical composition (X-ray photoelectron spectroscopy (XPS)) of the surface layer was established. Electrochemical impedance spectroscopy in 5 % NaCl solution was used for the determination of the corrosion resistance of the alloy.

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“…O circuito equivalente proposto, mostrado na Fig. 9, assemelha-se a circuitos reportados em literatura [24][25][26][27][28][29][30].…”

Section: Análise De Eie Por Circuito Equivalenteunclassified

“…A interpretação física de cada um dos elementos do circuito é: Z CPE(1) que denota a capacitância da dupla camada, R el a resistência do eletrólito que no diagrama Bode apresenta-se em altas freqüências (maior que 1kHz), R 1 a resistência à transferência de carga, Z CPE(2) e R 2 representam a capacitância e resistência de elementos intermediários como camada de óxido, hidretos e sulfetos [24][25][26][27][28][29][30].…”

Section: Análise De Eie Por Circuito Equivalenteunclassified

“…Em contraste, para as outras posições os valores de R 2 são maiores que R 1 , sugerindo que esta última resistência é aquela que tem maior representatividade no aspecto de proteção para a liga. Na literatura, Assis e seus colaboradores trabalhando com ligas Ti-Al [26] têm observado efeito similar. Os parâmetros de impedância mostrados na Tabela 1 confirmam as discussões feitas para a Fig.…”

Section: Análise De Eie Por Circuito Equivalenteunclassified

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A influência da microestrutura da liga Pb-0,85%Sb em seu comportamento eletroquímico

2008

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RESUMOO presente trabalho analisa os efeitos da taxa de resfriamento no crescimento celular da liga Pb-0,85%Sb e avalia a influência do tamanho das células e perfil de macrosegregação na resistência à corrosão. No sentido de se obter amostras brutas de solidificação foi utilizado um dispositivo de solidificação unidirecional refrigerado à água. Esse tipo de dispositivo, em função da ampla faixa de taxas de resfriamento que possibilita alcançar, permitiu a formação de microestruturas celulares com diferente grau de refino. Os aspectos microestruturais resultantes foram caracterizados por microscopia ótica e eletrônica. Amostras com diferentes aspectos microestruturais foram submetidas a testes de espectroscopia de impedância eletroquímica em uma solução 0,5M de H 2 SO 4 à temperatura de 25˚C e também analisadas pela técnica de extrapolação de Tafel para avaliação da resistência à corrosão. Os resultados mostraram que a densidade de corrente corrosão diminui com o aumento dos espaçamentos celulares. Esses resultados podem ser utilizados na programação prévia da microestrutura como uma forma de produzir componentes fundidos de ligas Pb-Sb, como placas de baterias, com melhor resistência à corrosão.Palavras chaves: liga Pb-Sb, solidificação direcional, microestrutura celular, comportamento eletroquímico. Microstructural influence of Pb-0.85wt%Sb casting alloy on its electrochemical behavior ABSTRACTThe aim of this study was to examine the effect of cooling rate on the cellular growth of a Pb-0.85wt%Sb alloy and to evaluate the influences of cell size and of the corresponding macrosegregation profile on the resultant corrosion behavior. In order to obtain the as-cast samples a water-cooled unidirectional solidification system was used. Such experimental set-up has permitted the development of a clear cellular structural array even for relative high cooling rates and has allowed a wide range of solidification conditions to be analyzed. Microstructural aspects along the casting were characterized by optical microscopy and SEM techniques. The electrochemical impedance spectroscopy technique and potentiodynamic curves (Tafel extrapolation) were used to analyze the corrosion resistance of samples collected along the casting length and immersed in a 0.5M H 2 SO 4 solution at 25ºC. It was found that the corrosion current density decreases with increasing cell spacing and that the pre-programming of microstructure cell size can be used as an alternative way to produce as-cast components of Pb-Sb alloys, such as battery grids, with better corrosion resistance.

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Corrosion characterization of titanium alloys by electrochemical techniques

Cited by 654 publications

References 19 publications

Study of the Vickers hardness and corrosion behavior of experimental Ti-Mo alloy in dental office bleaching agents

Study of the Vickers hardness and corrosion behavior of experimental Ti-Mo alloy in dental office bleaching agents

Anodic oxidation of the Ti–13Nb–13Zr alloy

A influência da microestrutura da liga Pb-0,85%Sb em seu comportamento eletroquímico

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