Hydrophobic and Corrosion Behavior of Sol-Gel Hybrid Coatings Based on the Combination of TiO2 NPs and Fluorinated Chains for Aluminum Alloys Protection

Rivero, Pedro J.; Maeztu, Juan Deyo; Berlanga, Calos; Miguel, Adrian; Palacio, José F.; Rodriguez, R.

doi:10.3390/met8121076

Cited by 21 publications

(18 citation statements)

References 64 publications

(100 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The advantages and disadvantages of these materials, and the processing methods developed were discussed. Table 2 shows that numerous OIH sol-gel coatings for corrosion applications were developed [30,50,137,[191][192][193][194][195][196][197]. The number of reviews reported, only since 2016, clearly indicates that this field is still under development and is far from reach a matured stage.…”

Section: [138]mentioning

confidence: 99%

“…The number of reviews reported, only since 2016, clearly indicates that this field is still under development and is far from reach a matured stage. Several OIHs for corrosion mitigation have been proposed for a wide range of metallic substrates, including aluminum and its alloys [30,63,74,137,198], carbon steel [193], stainless steel [196,[199][200][201] and galvanized steel [16,17,[202][203][204]. Copper [205][206][207] and magnesium [208][209][210][211][212][213][214] based alloys are other types of substrates in which OIH sol-gel coatings were used.…”

Section: [138]mentioning

confidence: 99%

“…Moreover, in the last decade, considerable attention has been given to the development of advanced and multifunctional OIH sol-gel coating materials. Impressive advances have been reported concerning the use of carriers [49,51,149,[221][222][223][224] loaded with functional abilities (e.g., self-healing [61,73,152,213], anti-fouling [132] and hydrophobicity [30,225]).…”

Section: [138]mentioning

confidence: 99%

“…The network modifiers contribute to the functionalization of the matrix. For example, some organic precursors, such as methyltriethoxy-silane (MTES), provide flexibility [27,28], while fluoro(triethyl)silane is known for its hydrophobic properties [27,29,30]. The most used network formers are 3-(trimethoxysilyl)propyl-methacrylate (MEMO) [27,31], (3-aminopropyl)triethoxysilane (APTES) [32,33] and (3-glycidoxypropyl)methyltriethoxysilane (GPTMS) [27,34,35].…”

Section: Introductionmentioning

confidence: 99%

“…To obtain OIH with anticorrosive performance, additional functions must be introduced within the OIH network, such as corrosion inhibitors [16,[49][50][51]. The alternatives proposed in the literature include OIH materials containing corrosion inhibitors such as zirconium [33,[52][53][54][55][56], titanium [30,57,58] and cerium [50,55,59]. M. Catauro et al synthesized OIH sol-gel materials based on zirconia (ZrO 2 ) and poly(ε-caprolactone) to coat pure titanium for implants application [56].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Figueira

2020

Polymers

View full text Add to dashboard Cite

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...

show abstract