Growth of MFI zeolite film as corrosion protection layer of aluminum alloy

Huang, Lin; Yuan, Hao; ChangJean, Wen-Chyuan; Wang, Mei Jhu; Chiang, Anthony S.T.; Tsai, Tseng-Chang

doi:10.1016/j.micromeso.2015.05.045

Cited by 15 publications

(19 citation statements)

References 42 publications

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“…14,30 The second class avoids the need to expose the substrate to a high-pH environment during zeolite crystal growth, thereby making it possible to deposit zeolites on silicon wafers, 29,31,32 glass substrates, 33,34 and aluminum alloy. 35,36…”

Section: Introductionmentioning

confidence: 99%

Wetting Properties and Thin-Film Quality in the Wet Deposition of Zeolites

et al. 2019

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Zeolites are microporous crystalline materials widely used in catalysis and adsorption applications. The fabrication of zeolite thin films and membranes has also opened up the possibility of using zeolites in electronic devices and membrane separations. The existing approach to growing zeolite films involves exposing the substrate to a high-pH environment; however, this process is applicable to only specific types of substrates. Our group has developed the direct wet deposition of zeolites via ultrasonic nozzle spray deposition to address this issue; however, the relationship between wetting properties and thin-film quality has yet to be investigated. In this study, we prepared zeolite CHA (Si:Al:P = 3:10:20) suspensions using different solvents and surfactants in various concentrations. We then examined the relationships among the composition of the cast solution, their wetting behavior on the glass substrate, and the uniformity of the resulting thin films. We found that using ethanol as a solvent with zeolite crystals in low concentrations with added surfactant yielded zeolite films of high quality. We were also able to produce low-haze zeolite coatings on glass. The zeolite coatings with high hydrophilicity and adsorption capacity presented excellent antifogging capability.

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Section: Introductionmentioning

confidence: 99%

Wetting Properties and Thin-Film Quality in the Wet Deposition of Zeolites

et al. 2019

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“…Based on these considerations, hydrothermal synthesis of zeolite coatings with anti-corrosion performance remains a great and promising challenge, considering that this deposition strategy is able to simply obtain well-ordered and interconnected zeolite grain films [48,50].…”

Section: Anti-corrosion Zeolite Coatingsmentioning

confidence: 99%

“…In the same year Pande et al [58] have reported a very extensive work in which demonstrated an effective protective action of DGC ZSM-5 zeolite coatings in different acidic environmental conditions. Afterwards, other works were published evidencing the suitability of this deposition technique [8,50]. More recently, in 2018, Tsai et al [36] realized a DGC coatings by using MFI zeolite showing its performance stability in the whole pH range of NaCl electrolyte solution.…”

Section: Anti-corrosion Zeolite Coatingsmentioning

confidence: 99%

Anticorrosion Behavior of Zeolite Coatings Obtained by In Situ Crystallization: A Critical Review

Calabrese

2018

Materials

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Zeolites are crystalline nanoporous aluminosilicates. Thanks to their intrinsically nanoporous structure they are widely used as molecular sieves, for exchanging ions, or, also thanks to the high surface area of these structures, for catalytic applications. Furthermore, thanks to their thermal and chemical stability, in recent years zeolite coatings have been evaluated for application as anti-corrosion coatings. The non-toxicity of this class of coatings makes it possible that they will be an environmentally friendly alternative to conventional chromate-based coatings. This article provides a brief review of the anti-corrosion performance of zeolite coatings, applied by direct synthesis technique to several metals and alloys, as discussed in the literature. After a short description of the microstructure and properties of zeolites, the discussion addresses the research activities related to this topic, as reported in the literature. Comparative analysis of literature results supported the dry-gel conversion method as a promising approach that combines a simplified synthesis procedure with anti-corrosion coating performance. Based on these considerations, an evaluation of future trends is discussed along with the final remarks.

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“…The external surface of high-silicon zeolites (i.e., crystalline microporous aluminosilicates) is composed of densely ordered silanol groups, − which make them ideal for antifog coatings. Despite being broadly used for catalysis, − adsorption, , membranes for molecular separations − and membrane reactors, − thin films for electronic devices, − gas detection, , anticorrosion, − antireflection, and photocatalysis, there are only few reports on using zeolites as antifog coating. ,, The key limitation is the deposition method of zeolites on glass substrates. The well-developed methods used in the fabrication of zeolite films or membranes include in situ growth, ,, seeded growth, , dip coating, , and dry-gel conversion. , Note that these methods require exposing substrates to a high-pH environment (i.e., the synthesis solution with structure-directing agents) for hours to form a zeolite layer.…”

Section: Introductionmentioning

confidence: 99%

Toward Long-Lasting Low-Haze Antifog Coatings through the Deposition of Zeolites

Chang

Hsu

Hung

et al. 2020

Ind. Eng. Chem. Res.

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High-performance antifog coatings are critical for devices operating in high-humidity environments, such as endoscopes. However, existing antifog coatings have been unable to achieve good antifogging capability with low haze, uniform color, and high durability. The relationships between the properties of the cast solution and the quality of the resulting coatings remain unclear. This work was aimed to investigate the spreading dynamics of zeolite cast solutions on a glass substrate to elucidate the relationship between the wetting behavior and thin-film quality, as quantified by transmittance and haze. The fundamental understanding will lead to the development of highly stable zeolite-based antifog coatings with low haze and free from the interference effect. We used direct wet deposition to coat a glass substrate with a layer of pure-silica zeolite MFI, whose surface had a silanol density. The solvent and composition of the zeolite suspensions were varied with the aim of optimizing the uniformity of the coating. We found that the bulk transmittance and haze of the coating were dominantly controlled by the packing of zeolite particles at the micrometer scale, which was affected by the wetting property of the cast solution on the substrate. Our results demonstrated that long-lasting low-haze antifog coatings can be produced from pure-silica zeolite MFI suspended in ethanol in the absence of amorphous silica colloids.

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Growth of MFI zeolite film as corrosion protection layer of aluminum alloy

Cited by 15 publications

References 42 publications

Wetting Properties and Thin-Film Quality in the Wet Deposition of Zeolites

Wetting Properties and Thin-Film Quality in the Wet Deposition of Zeolites

Anticorrosion Behavior of Zeolite Coatings Obtained by In Situ Crystallization: A Critical Review

Toward Long-Lasting Low-Haze Antifog Coatings through the Deposition of Zeolites

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