Characterization of hybrid sol–gel coatings doped with hydrotalcite-like compounds to improve corrosion resistance of AA2024-T3 alloys

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

doi:10.1016/j.porgcoat.2009.10.014

Cited by 42 publications

(26 citation statements)

References 39 publications

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“…From this point forward, several types of organically-modified sol-gel coatings have been studied for the corrosion protection of aluminium alloys [86][87][88][89][90][91][92][93][94]. Most of them are based on organo-alkoxysilane precursors containing organo-functional groups, like epoxy [84,92,93,[95][96][97][98][99][100][101][102][103][104][105][106][107], methacrylic [36,108], or vinyl [15] that can be polymerized further increasing the coatingʹs density, and thus improving its barrier effect [84]. This shows better anticorrosive properties in comparison to hybrid sol-gel coatings based on non-functional organosilanes.…”

Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

“…Furthermore, the release of inhibitors can also be indirectly triggered by pH changes: at very high pH the inhibitors can be exchanged with hydroxyl anions, whereas at very low pH the LDHs dissolve releasing the entrapped inhibitors [39]. 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].…”

Section: Corrosion Protective Sol-gel Coatings In Aluminium Substratesmentioning

confidence: 99%

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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%

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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“…The adherence improvement of this system can be attributed to the optimal anchoring of sol-gel with the aluminum substrate. In a previous publication (8) it was explained that total adherence is related to the density of Si/Zr-O-Al bonds at the interface; however, since the main precursor of sol-gel, the GPTMS, has a nonhydrolysable group, it does not participate in the condensation reaction and thus, it does not contribute to the adhesion properties; therefore, the adhesion mechanism must be related to the interactions of the sol-gel film with the rugosity profile of the substrate. Regarding the morphological characterization, Figure 6 depicts the SEM micrographs for the four samples obtained in the mode of backscattered electrons since secondary electrons provided smooth surfaces only.…”

Section: Resultsmentioning

confidence: 93%

“…For example, carbon steel alloys use methyltriethoxysilane (MTES) in conjunction with tetraethoxysilane (TEOS) (6) and aluminum alloys use silica precursors such as 3-Glycidyloxypropyl) trimethoxysilane (GPTMS) (7). The aluminum alloys form M-O-Al bonds that promote adherence (M can be Si or Zr coming from the formulation) between the metal interface and the sol-gel film (8). As expected, the adhesion properties and the anticorrosive properties will depend on the superficial defects generated during deposition.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Coating Deposition Technique on the Protective Properties of Hybrid Sol-Gel on AA2024

Covelo

Puente-Lee²,

Uruchurtu³

et al. 2015

ECS Trans.

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The deposition technique effect on the corrosion properties of thin films applied on AA2024 was evaluated. The deposition techniques were spin-dip coating and brush-spray painting. For each technique different parameters were varied in accordance with its nature of deposition. The coating was synthesized by the sol-gel method of copolymerization of 3-Glycydoxypropyltrimethoxysilane, and tetra-n-propoxyzirconium was deposited on an AA2024 substrate. Scanning electron microscopy and atomic force microscopy revealed that the spincoating method formed a more homogenous film than the dipcoating method. The time deposition and the surface finishing significantly modified the bond strength between substrate and solgel coating. The corrosion properties were assessed by Electrochemical Impedance Spectroscopy. These results revealed that the spin-coating technique provides not only better corrosion properties of the sol-gel but also a marked improvement of the corrosion resistance on aluminum at longer immersion times in NaCl. The combination of ground finishing in conjunction with time deposition modifies the properties of sol-gel significantly.

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“…As it can be seen, it is clearly distinguished that incorporation of HT at 5 % wt., did not improve neither the sol-gel dielectric properties nor corrosion process at lower frequencies even at the beginning of test. This behavior induces to think that hydrotalcite particles generate bigger defects such as pores, voids or even cracks inside the coating, which contributes to increase the corrosion activity within the defects (16). In addition, it is possible that this amount of hydrotalcite could also affect the final network of the coating.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Hybrid Sol-Gel Coatings Doped with Hydrotalcite-likeCompounds on Steel and Stainless Steel Alloys

et al. 2013

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Hybrid sol-gel organic-inorganic coatings have been extensively studied to their active properties to protect different metal surfaces. Incorporation of non-hydrolysable groups in conjunction with different molar ratio of sol-gel precursors dissolved in distinct solvents lead to an increment of better protective barrier properties. Different hybrid silica sol-gel coatings were prepared changing the type and content of solvent (2-propanol, ethylacetate, ethanol). Coatings were deposited by dip-coating method on AISI 304 stainless steel and low carbon steel. Incorporation of ethyl acetate in the sol-gel formulation provided the best results on low carbon steel whereas 2-propanol resulted adequate for stainless steel by means of electrochemical impedance (EIS) characterization. In addition, EIS showed a marked improvement of the corrosion resistance when hydrotalcite particles were incorporated into the coating. Scanning electron microscopy (SEM) revealed homogeneous coating deposition for low carbon steel samples. However, stainless steel samples developed cracks along the solgel coating.

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Characterization of hybrid sol–gel coatings doped with hydrotalcite-like compounds to improve corrosion resistance of AA2024-T3 alloys

Cited by 42 publications

References 39 publications

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

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

Effect of the Coating Deposition Technique on the Protective Properties of Hybrid Sol-Gel on AA2024

Characterization of Hybrid Sol-Gel Coatings Doped with Hydrotalcite-likeCompounds on Steel and Stainless Steel Alloys

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