Electrochemical deposition and characterization of ZrO2 ceramic nanocoatings on superelastic NiTi alloy

Lopes, Natália Isabel Azevedo; Freire, N.H.J.; Resende, Pedro Damas; Santos, Leandro Arruda; Buono, Vicente Tadeu Lopes

doi:10.1016/j.apsusc.2018.04.154

Cited by 19 publications

(8 citation statements)

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“…The cathodic electrodeposition is a widespread process to obtain nanostructured films in various metallic substrates, with important advantages such as thickness control, good uniformity, and purity of the obtained films 14,15 . Previous studies have shown that the application of ZrO 2 coatings improves the corrosion resistance of Ni-Ti alloys, avoid nickel release to the human body, and can potentially reduce its failure in bioapplications 8,16,17 . However, the characterization of ZrO 2 nanocoatings is difficult due to their reduced dimensions.…”

Section: Electrodeposited Coating and Characterization Limitationsmentioning

confidence: 99%

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ToF-SIMS Characterization of Nanostructured ZrO2 Coatings Applied to Near Equiatomic Ni-Ti Alloy

et al. 2019

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The ToF-SIMS technique was applied to analyze thin ZrO 2 coatings deposited on the surface of a Ni-Ti alloy. Due to its nanostructured nature, these films are difficult to characterize by conventional techniques. ZrO 2 coatings were deposited on near equiatomic Ni-Ti wires by pulse electrodeposition. Part of the samples was electrolytically polished before the coating process. The coated samples were then analyzed by ToF-SIMS to evaluate the influence of the deposition time and previous surface electropolishing on the structure of the deposited coating. The results indicate that thicker coatings were produced on the electropolished samples, in comparison with the as-received ones. The best uniformity in thickness was achieved when Ni-Ti samples were previously electropolished followed by ZrO 2 electrodeposition for 1200 seconds. Moreover, it was possible to observe by this technique that the inclusions in the Ni-Ti matrix were not entirely covered by the coating.

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Section: Electrodeposited Coating and Characterization Limitationsmentioning

confidence: 99%

“…In this study, the ToF-SIMS technique was applied to the analysis of difficult-to-characterize nanostructured ZrO 2 films deposited on Ni-Ti wires 8 . The coatings were obtained using pulsed cathodic electrodeposition for different times on wires as received and electrolytically polished.…”

Section: Introductionmentioning

confidence: 99%

ToF-SIMS Characterization of Nanostructured ZrO2 Coatings Applied to Near Equiatomic Ni-Ti Alloy

et al. 2019

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“…Segundo Yen [13], a presença de íons NO 3acelera a redução do H + , prejudicando a deposição e a aderência do hidróxido de zircônio na superfície do fio (Equação 4). Além disso, Lopes et al [14] observaram um maior potencial para redução de H + na presença de cloreto do que na presença de nitrato, o que justifica o melhor aspecto superficial obtido usando a solução de ZrOCl 2 . Até o momento, existem poucos estudos na literatura sobre a influência da densidade de corrente aplicada na eletrodeposição de ZrO 2 em substratos metálicos, especialmente em ligas NiTi.…”

Section: Tabela 1 Condições Para Eletrodeposição De Zrounclassified

“…No presente estudo, não foram observadas trincas na superfície do revestimento, quando o eletrólito de ZrOCl 2 foi utilizado, provavelmente devido à baixa espessura do revestimento obtido e pela etapa de desidratação da zircônia se passar naturalmente ao ar e não por recozimento (Equação 5). Em geral, quando a eletrodeposição é feita usando corrente pulsada, e não corrente contínua, um revestimento mais uniforme e sem trincas pode ser obtido [5,14].…”

Section: Tabela 1 Condições Para Eletrodeposição De Zrounclassified

Efeitos Da Densidade De Corrente Na Morfologia De Revestimenos De Zircônia Eletrodepositados Em Niti

Pagotto¹,

Lopes²,

Silva³

et al. 2019

ABM Proceedings

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Revestimentos de zircônia possuem boa resistência à corrosão e ao desgaste, além de biocompatibilidade. Desse modo, se apresentam como boa alternativa para a proteção contra a corrosão e a degradação de ligas NiTi utilizadas como biomateriais, com o potencial de evitar os efeitos alergênicos causados pela liberação de íons níquel no organismo e de diminuir os riscos de falhas durante seu uso. Neste estudo, a influência da densidade de corrente na morfologia dos revestimentos obtidos por eletrodeposição em uma liga NiTi superelástica foi avaliada. A eletrodeposição foi feita usando dois eletrólitos aquosos de sais distintos: Zr(NO 3) 2 e ZrOCl 2 , nas condições encontradas na literatura e variando os valores de densidade de corrente aplicados. Para caracterização foram realizadas análises por MEV, EDX e DRX. Usando o eletrólito de Zr(NO 3) 2 e corrente de 5 mA•cm-2 , o revestimento obtido mostrou-se heterogêneo e, para todos os valores de corrente, o teor de Zr detectado foi muito baixo. Quando o eletrólito de ZrOCl 2 foi utilizado, os teores de Zr detectados foram mais altos e as diferenças entre os revestimentos obtidos foram mais sutis. Melhor aspecto superficial e maior teor de Zr foram obtidos usando corrente de 3 mA•cm-2 e o eletrólito de ZrOCl 2 .

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“…These coatings significantly improve the corrosion resistance of stainless steel when put in a 0.1 M sodium sulphate solution by almost four orders of magnitude compared with the bare stainless steel. The corrosion resistances of ZrO 2 ceramic nanocoatings on superelastic NiTi alloy in Hank's simulated physiological solution were also evaluated [14]. It was found to prevent the premature failures of NiTi components and nickel release to the human body.…”

Section: Introductionmentioning

confidence: 99%

In Situ Preparation and Corrosion Resistance of a ZrO2 Film on a ZrB2 Ceramic

Zhang

et al. 2019

Coatings

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ZrO2 films were in situ prepared using the anodic passivation of a ZrB2 ceramic in alkaline solutions. The composition and structure of the films were characterized using field-emission scanning electron microscopy (FE-SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The corrosion resistances were evaluated in 0.1 M oxalate solution using the potentiodynamic polarization method (PDP) and the electrochemical impedance spectroscopy (EIS) technique. The results show that ZrO2 films can be prepared using anodization from −0.8 to 0.8 V standard hydrogen electrode (SHE) in 2–16 M NaOH solutions. During the anodization, the dehydration reaction of Zr(OH)4 to ZrO2 caused the volume shrinkage and tensile stress of the films. When the thickness of the films exceeded a critical value, the mud-cracking morphology occurred. The films without cracks exhibited the inhibition effect and provided effective corrosion protection in a 0.1 M H2C2O4 solution, which had a positive correlation with the film thickness. The film obtained when put in an 8 M NaOH solution (near the critical thickness) was found to significantly improve its corrosion resistance when put in a 0.1 M H2C2O4 solution by almost one order of magnitude compared with the bare ceramic.

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Electrochemical deposition and characterization of ZrO2 ceramic nanocoatings on superelastic NiTi alloy

Cited by 19 publications

References 40 publications

ToF-SIMS Characterization of Nanostructured ZrO2 Coatings Applied to Near Equiatomic Ni-Ti Alloy

ToF-SIMS Characterization of Nanostructured ZrO2 Coatings Applied to Near Equiatomic Ni-Ti Alloy

Efeitos Da Densidade De Corrente Na Morfologia De Revestimenos De Zircônia Eletrodepositados Em Niti

In Situ Preparation and Corrosion Resistance of a ZrO2 Film on a ZrB2 Ceramic

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