Evaluation of self-healing properties of inhibitor loaded nanoclay-based anticorrosive coatings on magnesium alloy AZ91D

Adsul, Swapnil H.; Raju, K. R. C. Soma; Sarada, Bulusu V.; Sonawane, Shirish H.; Subasri, R.

doi:10.1016/j.jma.2018.05.003

Cited by 59 publications

(13 citation statements)

References 32 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%

“…Adsul et al [66,213] studied the effect of loading cationic corrosion inhibitors (Ce 3+ /Zr 4+ ) into halloysite nanotubes, which were afterwards incorporated within an OIH sol-gel matrix and deposited on magnesium alloy substrates. The authors concluded the Ce 3+ /Zr 4+ loaded halloysite nanotubes dispersed within the OIH coating provided suitable corrosion protection of the substrate when exposed to 3.5% NaCl.…”

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: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

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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“…It is well known that magnesium (Mg) has highest chemical activity (the standard equilibrium potential of Mg/Mg 2+ is − 2.4 V NHE ) compared with other engineering metals, such as Fe (− 0.409 V NHE ), Al (− 1.706 V NHE ), which obviously limits its applications in a larger scale 1 – 3 . It is generally accepted that the Mg corrosion reactions can be written as 4 : …”

Section: Introductionmentioning

confidence: 99%

“…In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection.It is well known that magnesium (Mg) has highest chemical activity (the standard equilibrium potential of Mg/ Mg 2+ is − 2.4 V NHE ) compared with other engineering metals, such as Fe (− 0.409 V NHE ), Al (− 1.706 V NHE ), which obviously limits its applications in a larger scale [1][2][3] . It is generally accepted that the Mg corrosion reactions can be written as 4 :In fact, up to now, there is also dispute about the anodic reaction of Mg corrosion, such as Song et al 5 proposed a concept of anodic hydrogen evolution to describe hydrogen evolution associated with anodic dissolution.…”

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confidence: 99%

Corrosion protection properties of different inhibitors containing PEO/LDHs composite coating on magnesium alloy AZ31

Zhang

Jiang

et al. 2021

Sci Rep

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Corrosion inhibitors 2,5-pyridinedicarboxilate (PDC), sodium metavanadate (SMV) and 5-aminosalicylate (AS) were impregnated into porous PEO coatings respectively via vacuuming process, followed by fast sealing treatment in a Ce containing solution. After that layered double hydroxides (LDHs) based nanocontainers were respectively prepared on them via hydrothermal treatment. In frame of this work it was shown, that sealing effect for the pore was provided by formation of new phase CeO2 on the surface of PEO coatings. And, hydrothermal preparation for preparing LDHs leaded obvious changes in structure and thickness of the coatings. In addition, impregnation of inhibitors was in favor of improving LDHs content in final composite coatings. EIS result indicated that AS/Ce-HT specimen exhibited a best corrosion protection.

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