Aluminum pillared montmorillonite clay-based self-healing coatings for corrosion protection of magnesium alloy AZ91D

Adsul, Swapnil H.; Siva, T.; Sathiyanarayanan, S.; Sonawane, Shirish H.; Subasri, R.

doi:10.1016/j.surfcoat.2018.08.034

Cited by 30 publications

(6 citation statements)

References 23 publications

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“…Several OIH sol-gel coatings have been reported as smart with self-healing abilities, such as the remarkable works reported by the M.G.S. Ferreira group [63,76,149,150,[253][254][255][256][257][258] and Adsul et al [66,213,259].…”

Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

“…The healing properties were confirmed through weight loss and electrochemical techniques. The same research group [259] also studied the incorporation of the same corrosion inhibitors into aluminum pillared montmorillonite clay. The montmorillonite clay was dispersed as received within the matrix sol-gel coatings.…”

Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

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Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…Analytical and microscopic studies revealed that carbon nanotubes were uniformly dispersed in the sol-gel coating, and the carbon nanotubes acted as an inhibitor container. Adsul et al first encapsulated the corrosion inhibitor Ce 3+ /Zr 4+ in kaolin clay nanotubes and aluminum-pillared montmorillonite clay, and was then dispersed into the sol-gel matrix before finally being deposited on the AZ91D Mg alloy via the impregnation method [ 88 , 89 ]. After an immersion in 3.5% NaCl solution for 1–24 h, the self-healing and anti-corrosion abilities of the coatings were evaluated by weight-loss experiments, potentiodynamic polarization, and EIS measurements.…”

Section: Bare Sol-gel Coatingsmentioning

confidence: 99%

Advances in the Modification of Silane-Based Sol-Gel Coating to Improve the Corrosion Resistance of Magnesium Alloys

2023

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As the lightest structural materials, magnesium (Mg) alloys play a significant role in vehicle weight reduction, aerospace, military equipment, energy saving, and emission reduction. However, the poor corrosion resistance of Mg alloys has become a bottleneck restricting its wide application. Developing a good surface protective coating can effectively improve the corrosion resistance of Mg alloys. The silane-based sol-gel coating technology has been widely used in the corrosion protection of Mg alloys in recent years due to its advantages of simple process, accessible tailoring of film composition and structure, and excellent corrosion resistance. Whereas the synthesis of sol-gel coatings includes the hydrolysis and dehydration process, which may inherently contain micron or nano defects in the coatings, thereby making it detrimental to the anti-corrosion effect. Therefore, in order to enhance their protection against corrosion, the appropriate modification of sol-gel coatings has become a current research hotspot. This review is based on the modification methods of silane-based sol-gels on the surface of Mg alloys, which are divided into four categories: bare sol-gel, nanoparticles, corrosion inhibitors, and sol-gel-based composite coatings. The modification methods and corrosion protection mechanism are discussed respectively, and the application, development, and research strategies of silane-based sol-gel coatings are included.

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“…Incorporation of two-dimensional plate-like nanofillers can effectively promote the mechanical and barrier properties of organic coating films. Hitherto, various studies have proven that nanofillers such as graphene oxide (GO), , montmorillonoid, , hexagonal boron nitride (h-BN), , and molybdenum disulfide (MoS 2 ) can improve the anticorrosion performance of a coating film. It has been recently demonstrated for organic solvent-based coatings that another plate-like nanofiller, zirconium phosphate (ZrP), is effective in enhancing corrosion resistance. , Compared with the other nanofillers mentioned above, ZrP has the advantages of good exfoliability and controllable size, and it can be easily designed for various applications such as fire retardance and catalysis; thus, it has great potential as a multifunctional filler.…”

Section: Introductionmentioning

confidence: 99%

“…16 Incorporation of two-dimensional plate-like nanofillers can effectively promote the mechanical and barrier properties of organic coating films. Hitherto, various studies have proven that nanofillers such as graphene oxide (GO), 17,18 montmorillonoid, 19,20 hexagonal boron nitride (h-BN), 21,22 and molybdenum disulfide (MoS 2 ) 23 can improve the anticorrosion performance of a coating film. It has been recently demonstrated for organic solvent-based coatings that another plate-like nanofiller, zirconium phosphate (ZrP), is effective in enhancing corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Waterborne Epoxy Resin/Polydopamine Modified Zirconium Phosphate Nanocomposite for Anticorrosive Coating

Sheng

et al. 2019

Ind. Eng. Chem. Res.

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Replacing solvent-based coatings with waterborne resin ones has become an overall trend in the coating industrial to reduce pollution caused by volatile organic compounds. It is known that introduction of flexibly designable two-dimensional nanoplatelets or zirconium phosphate (ZrP) can improve the mechanical and barrier properties of a film from solvent-based coatings. In this work, we have designed a methodology to prepare nanocomposites for waterborne coating, which consist of waterborne epoxy resin (WER) and polydopamine modified ZrP (PDA-ZrP). It is found that PDA-ZrP has excellent compatibility with WER, and consequently, the film defects of pure WER are fixed. The PDA-ZrP/WER coating exhibits an extremely low corrosion current (1.09 × 10–9 A cm–2) at 1.0% PDA-ZrP loading. It is about 500 times lower than that of the pure WER coating (5.82 × 10–7 A cm–2), and consequently, the same coating has a much smaller rusted area after a salt spray test of 310 h. It should also be noted that all materials we used are eco-friendly, and all experimental procedures are conducted under mild conditions.

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Aluminum pillared montmorillonite clay-based self-healing coatings for corrosion protection of magnesium alloy AZ91D

Cited by 30 publications

References 23 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Advances in the Modification of Silane-Based Sol-Gel Coating to Improve the Corrosion Resistance of Magnesium Alloys

Waterborne Epoxy Resin/Polydopamine Modified Zirconium Phosphate Nanocomposite for Anticorrosive Coating

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