Carbon nanotube-reinforced siloxane-PMMA hybrid coatings with high corrosion resistance

Hammer, Peter; Santos, F. C. dos; Cerrutti, Bianca M.; Pulcinelli, Sandra Helena; Santilli, Celso Valentim

doi:10.1016/j.porgcoat.2012.11.015

Cited by 66 publications

(40 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recent studies on the inclusion of carbon nanotubes and graphene oxide in hybrid and polymer matrices have shown excellent results in terms of increased mechanical strength, scratch and wear resistance, thermal stability, adhesion to metallic substrate, hydrophobicity, and electrical conductivity [18,19,[28][29][30]. Despite all of these advances, a simultaneous improvement not only of mechanical and thermal stability but also of anticorrosive efficiency of protective coatings has been accomplished only recently by the incorporation CNT and GO in a PMMA-silica matrix [18].…”

Section: Pmma-silica Hybrid Reinforced With Lignin Carbon Nanotubes mentioning

confidence: 99%

Organic-Inorganic Hybrid Coatings for Corrosion Protection of Metallic Surfaces

Harb

Trentin²,

Torrico

et al. 2017

New Technologies in Protective Coatings

View full text Add to dashboard Cite

A variety of organic-inorganic hybrids have been designed to act as anticorrosive coatings of metallic substrates. Among them, epoxy-silica and poly(methyl methacrylate) (PMMA)-silica hybrids, prepared by the sol-gel process and deposited onto steel or aluminum alloys, have demonstrated high anticorrosive efficiency combined with high thermal and mechanical resistance. Lignin, carbon nanotubes, and graphene oxide have been incorporated into PMMA-silica hybrids as reinforcement agents, and cerium (IV) as corrosion inhibitor. Both hybrids were characterized in terms of their structural and thermal characteristics using different pectroscopies, microscopies and thermogravimetric analysis. Both hybrids present homogeneous nanostructure composed of highly condensed silica nanodomains covalently bonded to the polymeric phase. The transparent coatings with a thickness of 2-7 μm have low surface roughness, high adhesion to metallic substrates, elevated thermal stability, and excellent barrier behavior. Electrochemical impedance spectroscopy showed for coated samples a high corrosion resistance of up to 50 GΩ cm2 and durability >18 months in saline solution. Further improvement of corrosion resistance, thermal and mechanical stability was achieved by incorporation of lignin, carbon nanotubes, and graphene oxide into PMMA-silica matrix, and a self-healing effect was observed after Ce(IV) addition. The results are compared and discussed with those recently reported for a variety of hybrid coatings.

show abstract

Section: Pmma-silica Hybrid Reinforced With Lignin Carbon Nanotubes mentioning

confidence: 99%

Organic-Inorganic Hybrid Coatings for Corrosion Protection of Metallic Surfaces

Harb

Trentin²,

Torrico

et al. 2017

New Technologies in Protective Coatings

View full text Add to dashboard Cite

show abstract

“…Thus the ramified siloxane cross-link nodes interconnected covalently by short polymeric chains form a chemically inert barrier, which prevents penetration of species that initiate corrosive processes [16,17]. Furthermore, the incorporation of additives such as cerium ions as corrosion inhibitor and carbon nanotubes results in improvement of the corrosion protection efficiency and mechanic stability of the hybrids [18,19,20].…”

Section: Introductionmentioning

confidence: 99%

Siloxane–PMMA hybrid anti-corrosion coatings reinforced by lignin

Harb

Cerrutti

Pulcinelli

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

a b s t r a c t a r t i c l e i n f o Available online xxxx Keywords: Lignin Siloxane-PMMA hybrid Sol-gel process Anti-corrosion coatingsNovel organic-inorganic hybrid coatings prepared using siloxane-poly(methyl methacrylate) (PMMA) were synthesized using the sol-gel process, with incorporation of lignin to improve mechanical strength, thermal stability and hydrophobicity, while maintaining the high anti-corrosive protection of siloxane-PMMA coatings. Dispersion of lignin in the siloxane-PMMA hybrid was analyzed by optical microscopy. Structural, morphological and wettability analysis of the about 2.5 μm thick coatings, deposited on carbon steel by dip-coating, was performed by X-ray photoelectron spectroscopy, atomic force microscopy and contact angle measurements. Thermal stability was investigated by thermogravimetry and the mechanical properties were studied by microhardness and microscratch measurements. Electrochemical impedance spectroscopy was used to evaluate corrosion resistance in saline aqueous environments. All coatings showed good dispersion of lignin in the hybrid matrix and low surface roughness between 0.3 and 0.4 nm. Incorporation of lignin increased hydrophobicity, microhardness and scratch resistance, in addition to shifting thermal degradation events to higher temperatures. The electrochemical tests showed that the hybrids act as efficient diffusion barriers, with corrosion resistance in the range of 10 8 Ωcm 2 after exposure to 3.5% NaCl aqueous solution. The hybrid containing a intermediate lignin content of 0.10 wt.% presented the best result, exhibiting the most hydrophobic surface (87.9°water drop contact angle), the highest hardness value (31.5 HV), high scratch resistance (up to 80.7 mN) and elevated impedance modulus (10 8 Ωcm 2 ) after 50 days exposure.

show abstract

“…On the one hand, MWCNTs can be well dispersed in the BTESPT/TiO 2 coating, forming a dense and highly crosslinked network. At the same time, the MWCNTs can also strengthen the interfacial adhesion between the metal and the composite coating [44]. On the other hand, the MWCNTs with high electrical conductivity can transmit the excess electrons accumulated at metal/coating interface to the coating surface, hindering the occurrence of electrochemical reactions on the substrate to extend the time of protection for the substrate [45].…”

Section: Electrochemical Impedance Studiesmentioning

confidence: 99%