The effects of cerium ions on the curing, polymerisation and condensation of hybrid sol-gel coatings

Tiringer, Urša; Mušič, Branka; Zimerl, Dolores; Šekularac, Gavrilo; Stavber, Stojan; Milošev, Ingrid

doi:10.1016/j.jnoncrysol.2018.12.021

Cited by 17 publications

(9 citation statements)

References 38 publications

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“…Strategies such as the addition of polymerizable agents [69,209] to restore/heal the damage in a polymeric coating or the inclusion of corrosion inhibitors ( Figure 5) [50,153,221,234] to stop the damage spread have been reported. Metals such as cerium [50,59,200,220,[235][236][237][238], lanthanum [239][240][241] or zirconium [33,53] have been incorporated in OIH sol-gel coatings in order to stop corrosion propagation [234,236,237,242,243]. Studies based on OIH coatings doped with cerium inhibitors have been reported since 2002 [235,244].…”

Section: Sol-gel Coatings With Self-healing Functionmentioning

confidence: 99%

“…The electrochemical data indicated that the coatings doped with Ce(NO 3 ) 3 and cured with heating ramp exhibited improved corrosion properties. Later, in 2019 the same authors [238], reported the synthesis of OIH sol-gel coatings based on the same precursors also doped and undoped with Ce(NO 3 ) 3 . The effects of curing temperature and the addition of Ce(NO 3 ) 3 on the degree of polycondensation of the OIH sols were studied.…”

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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“…Cerium ions were added also to GTS coatings. 82,83,87 GTS-Ce coatings exhibited enhanced corrosion properties, as shown by reduced current density in polarization curves (Fig. 14a) 82 and excellent protection during longterm immersion up to 50 days in NaCl solution (Fig.…”

Section: Sol-gel Coatings With Active Functionmentioning

confidence: 99%

“…The establishment of Si−O−Si, and especially Si−O−Zr, bonds is crucial to achieve excellent corrosion protection: a lower number of free silanol groups (fewer T 1 silicon species) and formation of more condensed T 2 and T 3 silicon species improved coating properties. 81,83 TMZ coatings are acrylate-based (MAPTMS and MMA). Another type of coatings developed in our laboratory are GTS epoxy-based coating prepared from TEOS and 3-glycidoxypropyl-trimethoxysilane (GPTMS) as precursors ( Fig.…”

Section: Barrier Sol-gel Coatingsmentioning

confidence: 99%

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Contemporary Modes of Corrosion Protection and Functionalization of Materials

Milošev

2019

ACSi

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Corrosion protection is an important global issue. Corrosion affects all metal materials in industry, infrastructure, civil engineering, transport, biomedicine, etc. causing their deterioration and degradation. Corrosion protection is a necessity which enables the safe and well-functioning of metal structures and devices. In addition to long-term efficiency, corrosion protection should be environmentally and economically acceptable. Growing population with needs on modern and high-tech technologies is boosting consumption of base and rare earth metals. All these issues are putting high demands on area of corrosion protection with the main goal to prolong the lifetime of metal materials, reduce the need for steeply increasing production and thus preserve resources. In this review contemporary modes of corrosion protection of metal materials with the emphasis on copper and aluminium base alloys as one of most important base metals are presented. These include corrosion inhibitors, conversion, sol-gel and hydrophobic coatings. Examples are our research studies over the last decade are presented.

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