Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Di, S.X.; Guo, Yupeng; Lv, Hongwei; Yu, Jie; Li, Zhenwei

doi:10.1016/j.ceramint.2014.12.134

Cited by 81 publications

(12 citation statements)

References 41 publications

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“…Some remarkable properties of Ti such as high specific strength, low density, excellent thermal stability, high mechanical strength, chemical inertness and high corrosion resistance have led to widespread application of this metal and its alloys in the aerospace, automotive, chemical and biomedical industries [1][2][3]. The high reactivity of Ti and its alloys with oxygen when exposed to air or moisture leads to formation of thin protective oxide films (typically 2-5 nm) on their surfaces, which are the main contributors to high corrosion resistance in these materials [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Influence of different sodium-based additives on corrosion resistance of PEO coatings on pure Ti

Molaei

Fattah‐alhosseini

Keshavarz

2019

Journal of Asian Ceramic Societies

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In the present study, the plasma electrolytic oxidation method was used to form ceramic coatings on pure Ti substrates. For this purpose, five different aluminate-based electrolytes containing various sodium-based additives (sodium hydroxide, sodium phosphate, sodium silicate, sodium tetraborate and sodium fluoride) were used. The role of additives in the growth, macrostructure, surface and cross-sectional microstructure, phase composition and corrosion resistance of the coatings was evaluated. An X-ray diffractometer and scanning electron microscope were used to study the microstructure and phase composition of the coatings, respectively. The corrosion resistance of the coatings was investigated by applying electrochemical impedance spectroscopy and potentiodynamic polarization tests in a 3.5 wt. % NaCl solution. The results revealed that use of a sodium phosphate additive led to formation of a coating (4.33 µm thick) with the most suitable microstructure and highest corrosion resistance (4.36 × 10 6 Ω cm 2), which was 53 times higher than that of uncoated Ti.

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Section: Introductionmentioning

confidence: 99%

Influence of different sodium-based additives on corrosion resistance of PEO coatings on pure Ti

Molaei

Fattah‐alhosseini

Keshavarz

2019

Journal of Asian Ceramic Societies

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“…There are several methods used for the preparation of TiO 2 doped with rare earth ions, they exist from the most complex and expensive to the simplest and cheapest. These methods vary depending on the final structure that is desired, for example, to obtain thin films or coatings, the following methods are more used: Micro-arc oxidation [34], magnetron sputtering [35], spin coating [36] and dip coating [37]. To prepare powders with defined nanostructures are electrospinning (nanofibers) [38], anodization (nanotubes) [39], microemulsion (spheres) [40], hydrothermal (nanowires) [41], state solid reaction (amorphous) [42], impregnation (amorphous) [43], and sol-gel (different structures) [44].…”

Section: Methods Of Synthesis Of Tio 2 -Rementioning

confidence: 99%

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Pérez¹,

Torres²,

Romero³

et al. 2019

Water and Wastewater Treatment

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Rare earth doping ions can improve the spectral response of this semiconductor to the visible region. This work evaluated the dopant effect of rare earth ions such as La, Ce, Nd, Pr, Sm, Eu, and Gd in titania for the solar photodegradation of Diuron and methyl parathion. The increase in the content up to 0.5% of dopants decreases photoactivity due to the formation of photo-generated electron-hole pair recombination centers. The catalysts calcined at 500°C presented only the anatase crystalline phase and the samples doped with La and Ce at 0.1 and 0.3% were the most active in diuron solar degradation; however, when the temperature of the thermal treatment increased to 800°C, mixtures of crystalline phases were presented. The catalyst with the highest anatase content showed the best performance. The materials calcined at 500°C with better performance in diuron solar degradation were selected to to treat methyl parathion using solar light. Finally, under these conditions, an affinity was found for the dopant ions in titania and in the functional groups of the contaminating molecules (phenylurea and thiophosphate). Solar photodegradation of diuron was more effective with La and Ce, while for methyl parathion, it was Eu at 0.3%.

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“…Moreover, the corrosion resistance of magnesium alloy coating can be improved by PEO after immersion with rare earth salt solution [ 23 ]. The authors of [ 24 ] show that electrolytes containing rare earth compounds can improve coating thickness, structure, and corrosion resistance. Adding CeO 2 particles to the oxidation solution can dope rare earth oxide into the PEO film, which can improve the structure of the film and increase the density of the film [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3

Jun

et al. 2018

Materials

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Plasma electrolytic oxidation (PEO) technique is one of the important methods used in the surface modification of magnesium alloys. In this paper, the ceramic coatings on pretreated KBM10 magnesium alloy with Nd(NO3)3 solution were prepared by PEO. The effects of Nd(NO3)3 solution concentration on the microstructure and corrosion resistance of PEO coatings on magnesium alloys were investigated by means of scanning electron microscopy (SEM), X-ray diffractometer (XRD), and electrochemical workstation. It was found that the surface of the coatings was porous after PEO, and element Nd could be deposited on the surface of the coatings by pretreatment and existed in the PEO coatings. The coating formed at Nd(NO3)3 solution concentration of 0.06 mol/L exhibited the best corrosion resistance among all the as-prepared coatings.

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Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Cited by 81 publications

References 41 publications

Influence of different sodium-based additives on corrosion resistance of PEO coatings on pure Ti

Influence of different sodium-based additives on corrosion resistance of PEO coatings on pure Ti

Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth

Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3

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Microstructure and properties of rare earth CeO2-doped TiO2 nanostructured composite coatings through micro-arc oxidation

Cited by 81 publications

References 41 publications

Influence of different sodium-based additives on corrosion resistance of PEO coatings on pure Ti

Influence of different sodium-based additives on corrosion resistance of PEO coatings on pure Ti

Photocatalytic Treatment of Pesticides Using TiO2 Doped with Rare Earth

Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3

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Photocatalytic Treatment of Pesticides Using TiO₂ Doped with Rare Earth