Self cleaning behaviour of Ni/nano-TiO2 metal matrix composites

Spanou, S.; Kontos, A.I.; Siokou, A.; Kontos, A. G.; Vaenas, Naoum; Falaras, Polycarpos; Pavlatou, Evangelia A.

doi:10.1016/j.electacta.2013.04.174

Cited by 40 publications

(38 citation statements)

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“…It is worth mentioning that since the early discovery of the self-cleaning properties of titanium dioxide (TiO 2 ) [19], it has been considered to be the most efficient, stable and cheap photocatalytic material available. Consequently, nno-TiO 2 application to various substrates, such as textiles, plastics and glasses, thus to confer self-cleaning property has been widely reported [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Fan

et al. 2016

Progress in Organic Coatings

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Fan

et al. 2016

Progress in Organic Coatings

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“…During the last few decades, researchers have attempted to improve those properties through electrocodeposition of hard particles such as Al 2 O 3 [1][2][3][4], TiO 2 [5,6], SiC [7][8][9], ZrO 2 [10,11], WS 2 [12], and Si 3 N 4 [13,14] in different metal matrixes (Ni, Cr, Co, etc.). Nickel is a most suitable metal, among all metal matrixes due to its good chemical compatibility with the other metal and alloys [18].…”

Section: Introductionmentioning

confidence: 99%

Pulse Electrocodeposited Ni–WC Composite Coating

Gupta

Das

Nagahanumaiah

et al. 2015

Materials and Manufacturing Processes

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In the present work, tungsten carbide (WC) particulate of average size 10 mm were electrocodeposited in the nickel metal matrix, to form metal matrix composite (MMC) coating over the EN8 steel substrate. The electrodeposition of Ni-WC particulate composite coating was carried out using the Watt's bath under the influence of varying current density and duty cycle. It was found that current density of 0.02 A/ cm 2 was sufficient to start the codeposition kinetics. But, good quality of electrodeposition was obtained at a current density of 0.04 A/cm 2 . The WC particulate entrapment and distribution of WC particles in Ni matrix according the variation in experimental parameters has been reported. The dense and compact microstructure was obtained at a current density of 0.04 A/cm 2 and duty cycle of 30%. Microhardness and corrosion resistance properties of composite coating were also evaluated and reported. INTRODUCTIONSurface modification, with the formation=deposition of overlaying layer of metal matrix composite (MMC), provides enhanced mechanical, tribological, and corrosion resistance properties. During the last few decades, researchers have attempted to improve those properties through electrocodeposition of hard particles such as Al 2 O 3 [1-4], TiO 2 [5, 6], SiC [7-9], ZrO 2 [10, 11], WS 2 [12], and Si 3 N 4 [13,14] in different metal matrixes (Ni, Cr, Co, etc.). Nickel is a most suitable metal, among all metal matrixes due to its good chemical compatibility with the other metal and alloys [18]. Moreover, it imparts very good corrosion resistance property to the coated surface. Tungsten carbide is a hard ceramic having high thermal stability and good dispersion properties which lead to high wear and thermal resistance properties of the coating. Deposition of electrically nonconductive tungsten carbide particles alone is very difficult, as it produces obstruction to obtain dense interface of metal-carbide during the electrodeposition process, but it can be easily codeposited with a transition group of elements. Although there are a number of surface coating techniques available, but the electrodeposition process has drawn significant attention because it is a nonthermal process, technologically feasible, easily controllable, economically superior technique to produce a MMC. It is based on the uniform entrapment of second-phase hard particles within the metal matrix.Although many research papers have been reported in the area of WC composite coating through direct current

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“…The results showed that the microhardness, corrosion and wear resistance increase with increasing content of TiO 2 nanoparticles in the coating. Spanou et al 12 have obtained Ni/TiO 2 composite coatings with self-cleaning properties as a result of TiO 2 nanoparticles codeposition in the nickel matrix. Lin and co-workers 13 have developed Ni/TiO 2 composite coatings by electrodeposition, with improved hardness as compared with pure nickel coating.…”

mentioning

confidence: 99%

“…10 Composite coatings of Ni/TiO 2 obtained by electrodeposition can meet various features that are significantly improved compared to pure Ni coatings. These characteristics can be listed as follows: hardness, corrosion and wear resistance, 11 self-cleaning behavior, 12 reduction of nickel recrystallization temperature, 13 etc. Baghery and co-workers 11 have prepared by electrodeposition Ni/TiO 2 nanocomposite coatings which have been characterized in terms of composition, hardness and resistance to corrosion and wear.…”

mentioning

confidence: 99%

Nucleation and Growth Mechanism of Ni/TiO₂Nanoparticles Electro-Codeposition

Benea

Dănăilă

2016

J. Electrochem. Soc.

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The mechanism of TiO 2 nanoparticles electro-codeposition with nickel is studied. In-situ different electrochemical techniques such as cyclic voltammetry, electrochemical impedance spectroscopy, chronoamperometry and chronocoulometry are used. The nucleation and growth mechanism of nickel in absence and presence of different nanoparticles concentration are analyzed through a mathematical model. The nucleation process of pure Ni system tends to follow the progressive model with three-dimensional fashion, while Ni/TiO 2 codeposition follows an instantaneous nucleation model. The presence of nanoparticles on the cathode offers many favorable sites for nickel crystallization nucleation, promote electrodeposition process and change the preferred orientation of nickel to a random one. The opportunity to codeposit inert nanoparticles from electrolytic baths has been widely used in metal electrodeposition in order to obtain structured nanocomposite coatings.1 Among the various techniques for producing nanostructured materials, electro-codeposition is technologically feasible and economically superior because this method can easily provide metal matrix nanocomposite coatings on surfaces of different sizes and shapes without porosity, with layer thicknesses from a few nanometers to hundreds of micrometers, or as a multilayer. Also this electrochemical method shows high production efficiency and the technological transfer from the laboratory to the existing infrastructure in the electroplating industry is easy.2 Compared to pure metal coatings, the nanostructured materials exhibit a wide range of new properties, such as increased resistance to wear and corrosion, improved mechanical properties (hardness, tensile strength, yield strength) and good electrocatalytic properties. 1,3Although the electro-codeposition process has aroused over time the interest of researchers for the development and characterization of metal matrix nanocomposites able to meet specific requirements, the theory of particles incorporation mechanisms is not well studied, being yet unclear. In addition such incorporating mechanism depends on each separate system (metal matrix-dispersed phase).In order to improve the properties to microhardness, wear and corrosion of the pure nickel coating, a variety of micro and nanometric sized particles such as Although in the scientific journals, many papers dealing with the electro-codeposition of Ni/TiO 2 composite coatings and their performance 9,11-13 the literature reporting the nucleation and growth mechanisms involved in the electro-codeposition of Ni/nano-TiO 2 layers by electrochemical methods is still scare. Nucleation and growth kinetics of the composite layers are the most important steps that determine the physico-chemical properties of the electrodeposited material and therefore these are crucial issues in understanding and controlling composite coatings. The electrochemical characterization of the nucleation process is generally done by collecting different types of transient current obtained when po...

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Self cleaning behaviour of Ni/nano-TiO2 metal matrix composites

Cited by 40 publications

References 42 publications

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Pulse Electrocodeposited Ni–WC Composite Coating

Nucleation and Growth Mechanism of Ni/TiO₂Nanoparticles Electro-Codeposition

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Self cleaning behaviour of Ni/nano-TiO2 metal matrix composites

Cited by 40 publications

References 42 publications

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Facile synthesis of casein-based TiO 2 nanocomposite for self-cleaning and high covering coatings: Insights from TiO 2 dosage

Pulse Electrocodeposited Ni–WC Composite Coating

Nucleation and Growth Mechanism of Ni/TiO2Nanoparticles Electro-Codeposition

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Nucleation and Growth Mechanism of Ni/TiO₂Nanoparticles Electro-Codeposition