Assessment of ZnO nanoparticles as anticorrosive pigment in hybrid sol–gel films

Álvarez, D.; Collazo, A.; Nóvoa, X.R.; Pérez, C.

doi:10.1016/j.porgcoat.2015.10.017

Cited by 20 publications

(10 citation statements)

References 51 publications

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“…Álvarez et al [102] incorporated different concentrations of hydrotalcite compounds into hybrid ZrTPO-GPTMS sol-gel coatings, the doped films showed increased adherence and corrosion resistance. In two other studies, concerning the incorporation of stimuli-response particles into hybrid epoxy-zirconia-silica sol-gel coatings, calcinated red mud particles were used showing inhibitive action, and modified zeolites were used to host cerium (III) compounds, improving the protective performance of the hybrid coatings applied on AA 2014-T3 alloy [101,145]. Another strategy to incorporate and stabilize inhibitor species within hybrid sol-gel coatings is the use of multi-layered coatings.…”

Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

et al. 2016

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Corrosion degradation of materials and metallic structures is one of the major issues that give rise to depreciation of assets, causing great financial outlays in their recovery and or prevention. Therefore, the development of active corrosion protection systems for metallic substrates is an issue of prime importance. The promising properties and wide application range of hybrid sol-gel-derived polymers have attracted significant attention over recent decades. The combination of organic polymers and inorganic materials in a single phase provides exceptional possibilities to tailor electrical, optical, anticorrosive, and mechanical properties for diverse applications. This unlimited design concept has led to the development of hybrid coatings for several applications, such as transparent plastics, glasses, and metals to prevent these substrates from permeation, mechanical abrasion, and corrosion, or even for decorative functions. Nevertheless, the development of new hybrid products requires a basic understanding of the fundamental chemistry, as well as of the parameters that influence the processing techniques, which will briefly be discussed. Additionally, this review will also summarize and discuss the most promising sol-gel coatings for corrosion protection of steel, aluminium, and their alloys conducted at an academic level.

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Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

et al. 2016

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“…Sol-gel encompasses hydrolysis and condensation of metal alkoxides or semi-metallic precursors under mild conditions, to generate a polymer network. [13][14][15][16][17][18][19] Alkoxides can form homogeneous sols in various solvents and in the presence of other alkoxides or metal derivatives, to produce homogeneous materials at the molecular level. The sol-gel process uses silicon alkoxides Si(OR) n , where R is an organic group (-CH 3 , -C 2 H 5 , etc.).…”

Section: -12mentioning

confidence: 99%

Calcium Phosphate Coatings by Sol-Gel on Acrylonitrile-butadiene-styrene Substrate

Bandeira¹,

Campos²,

Ciuffi³

et al. 2016

J. Braz. Chem. Soc.

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Additive manufacture is an effective technology to produce complex macrostructures from polymers. Sol-gel is a chemical process that affords multifunctional materials by functionalization of different substrates. This work reports on the use of acrylonitrile-butadiene-styrene polymer (ABS) as starting material to obtain a substrate by additive manufacture. Coating of ABS by the sol-gel methodology generated a multifunctional material. Sols with and without phosphate ions were prepared from silicon and calcium alkoxide. Based on X-ray diffraction patterns, a calcium phosphate crystalline structure emerged on ABS after contact of the substrate with simulated body fluid. Infrared analysis revealed that the peaks of the functionalized substrate shifted, indicating that ABS interacted with the sol-gel coating. According to thermal analysis, the maximum decomposition temperature of the coated samples was 20 °C higher as compared to non-coated ABS. Sol-gel and additive manufacture are important technologies to produce materials with applications in biological medium. Keywords: dip-coating, sol-gel, biomaterials IntroductionAdditive manufacture (AM, also known as rapid prototyping) assembles materials in the powder, filament, liquid, or slide form. The materials consist of successively stacked thin layers, resulting in a three-dimensional structure.AM uses computer-aided design (CAD) software to build a mould for the scaffold. The mould displays a branching network of shafts that will define the microchannels in the scaffold.1-5 The fusion deposition model (FDM) technique helps to structure the acrylonitrilebutadiene-styrene polymer (ABS), a mobile extruder head deposits layers of molten material. The layer-by-layer building approach produces highly complex structures that would be impossible to achieve with technologies based on material subtraction, the most frequently employed procedure nowadays. AM has important applications in several areas, including the aircraft and automobile industries, telecommunications, and medicine. [6][7][8] The sol-gel route is a chemical process that involves formation of a sol, namely a colloidal suspension of particles or molecules with liquid character and measuring between 1 and 1000 nm. The sol later goes through a gel phase, which consists of a colloidal system with solid character. In the gel phase, the molecules form a dispersed, continuous, branched, and interpenetrated structure in a system that is usually liquid. After solvent evaporation, the gel phase becomes a solid material that can be either a xerogel, if the solvent is removed by simple evaporation, or an aerogel, if the solvent is removed above its critical temperature and pressure. 9-12The sol-gel process is widely employed to prepare glasses and oxides and to modify surfaces. Sol-gel encompasses hydrolysis and condensation of metal alkoxides or semi-metallic precursors under mild conditions, to generate a polymer network. [13][14][15][16][17][18][19] Alkoxides can form homogeneous sols in various solvents and in the p...

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“…Examples of inorganic inhibitors are vanadates, molybdates, phosphates, chromium (IV) complexes or other heavy metal based compounds [11,[21][22][23]. Using the inorganic inhibitors is an economical alternative for stabilization the aluminium pigment in aqueous media [24]. The drawback is that heavy metal compounds are toxic and carcinogenic [3].…”

Section: The Aluminium Pigmentmentioning

confidence: 99%

The Treatment of Aluminium Pigments with Inorganic Polymers for Environment-Friendly Applications

Dragnea¹,

Gudovan²,

Zaharia³

et al. 2019

Rev. Chim.

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Aluminium pigments are used in industrial and decorative coatings, automotive industry and printing inks. The encapsulation of aluminium pigments is used because the industry wants to avoid the organic solvents, for environmental reasons, by shifting towards water-borne systems. However, aluminium pigments easily react with water and a large amount of hydrogen is released leading to degradation of optical properties. This work presents experimental results concerning the encapsulation of aluminium pigments in silica matrices, by a sol-gel method using TEOS as precursor and ethylendiamine or ammonia as catalysts for the hydrolysis and condensation reactions. The samples of encapsulated pigments were characterized by gas stability tests: a boiling method and a gassing method.

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Assessment of ZnO nanoparticles as anticorrosive pigment in hybrid sol–gel films

Cited by 20 publications

References 51 publications

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

Hybrid Sol-Gel Coatings: Smart and Green Materials for Corrosion Mitigation

Calcium Phosphate Coatings by Sol-Gel on Acrylonitrile-butadiene-styrene Substrate

The Treatment of Aluminium Pigments with Inorganic Polymers for Environment-Friendly Applications

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