Effect of inhibitor loading into nanocontainer additives of self-healing corrosion protection coatings on aluminum alloy A356.0

Manasa, S.; Jyothirmayi, A.; Siva, T.; Sathiyanarayanan, S.; Gobi, K. Vengatajalabathy; Subasri, R.

doi:10.1016/j.jallcom.2017.08.037

Cited by 51 publications

(22 citation statements)

References 22 publications

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“…It has been reported in different studies that the direct incorporation of these species may interfere with the curing of the coating material and compromise its physico-chemical performances [16,203,245]. Therefore, the selection of suitable carriers/nanocontainers, to ensure their release in response to a trigger (stimulus-responsive), is of extreme importance [67,151,228]. The trigger which can be physical or chemical (i.e., crack propagation, the presence of moisture, pH, aggressive species) [227,235,[246][247][248][249][250].…”

Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

“…Most of the data found in the literature indicate that the OIH sol-gel materials show an enormous potential in the field of coatings for corrosion mitigation. Several multifunctional OIH coatings have been reported in the last few years showing promising results, with functions adapted according to each metallic substrate and environment [60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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

Figueira

2020

Polymers

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“…Other interesting surface treatments are based on the use of wet-chemistry technologies such as the sol-gel technology [107]. In [108], hybrid sol-gel silica matrices embedded hallosyte nanotubes with and without cationic corrosion inhibitors (Ce 3+ /Zr 4+ ) are deposited onto aluminum alloy A356 by using the dip-coating technique. The experimental results have corroborated that the hybrid silica matrix sol-gel coating without any containers has provided good barrier protection only for a shorter duration of exposure to corrosive medium.…”

Section: Corrosion Resistance Of Coatings Obtained By Different Surfamentioning

confidence: 99%

Corrosion of Cast Aluminum Alloys: A Review

Labari

Biezma

Rivero

2020

Metals

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Research on corrosion resistance of cast aluminum alloys is reviewed in this article. The effect of the main microstructural features of cast aluminum alloys such as secondary dendrite arm spacing (SDAS), eutectic silicon morphology, grain size, macrosegregation, microsegregation, and intermetallic compounds is discussed. Moreover, the corrosion resistance of cast aluminum alloys obtained by modern manufacturing processes such as semi-solid and additive manufacturing are analyzed. Finally, the protective effects provided by different coatings on the aluminum cast alloys—such as anodized, plasma electrolytic oxidation (PEO), and laser—is reviewed. Some conclusions and future guidelines for future works are proposed.

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“…Regarding the loading process, active substances can be loaded into nanocontainers during [66] or after [67][68][69] the synthesis process. After the synthesis, nanocontainers could be directly loaded with the active agents [67][68] or using the assisted loading transfer process [69].…”

Section: Loading and Release Processesmentioning

confidence: 99%

“…After the synthesis, nanocontainers could be directly loaded with the active agents [67][68] or using the assisted loading transfer process [69]. In some cases, the loading process will be followed by the closing of the pores [70] or by the formation of the nanotube-end stoppers [71][72].…”

Section: Loading and Release Processesmentioning

confidence: 99%