Epoxy coating based on montmorillonite-polypyrrole: Electrical properties and prospective application on corrosion protection of steel

Contri, Giseli; Barra, Guilherme Mariz de Oliveira; Ramôa, Sílvia D.A.S.; Merlini, Claudia; Ecco, Luiz Gustavo; Souza, Fernando S. de; Spinelli, Almir

doi:10.1016/j.porgcoat.2017.10.008

Cited by 56 publications

(23 citation statements)

References 32 publications

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“…Similar results have been reported by Ramoa et al 35 for thermoplastic polyurethane (TPU) filled with Mt-PPy and PPy. Also, Contri et al 43 and Vargas et al 41 have found similar results for epoxy and thermoset polyurethane, respectively, with the same nanoparticles. Figure 3 illustrates the TEM micrographs from which it is possible to evaluate the influence of the conductive filler on the microstructure of the composites.…”

Section: Resultsmentioning

confidence: 55%

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

et al. 2019

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A novel pressure sensing material composed of poly (butylene adipate-co-terephthalate) (PBAT) and montmorillonite-polypyrrole (Mt-PPy) was prepared using melt mixing and injection molding. The structure and properties of the PBAT/Mt-PPy composites were evaluated and compared with those of the PBAT/PPy blends. The PBAT/Mt-PPy displays a very sharp insulator-conductor transition and its percolation threshold was reached at 6.5 wt% of Mt-PPy, which was lower than that for PBAT/ PPy (11.0 wt% of PPy). The transmission electron microscopy analysis shows that Mt-PPy displays a high aspect ratio and was better distributed and dispersed into PBAT compared to PPy. PBAT/Mt-PPy exhibits a decrease in the electrical resistivity with an applied compressive stress due to the formation of new conducting pathways. The electromechanical response was dependent on Mt-PPy and the maximum sensitivity was observed for the composite containing 10 wt% of Mt-PPy. In this system, the electrical resistivity drops from 9 x 10 6 to 2 x 10 6 Ω cm when a compressive stress of 0.25 MPa was applied. The electrical resistivity changes with applied compressive stress, the reproducibility and the reversibility makes PBAT/Mt-PPy a suitable material for the development of pressure sensors.

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Section: Resultsmentioning

confidence: 55%

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

et al. 2019

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“…This behavior can be attributed to an increased porosity allowing the free migration of the electrolyte through the coating (Bandeira et al, 2017). In this work the probable optimal concentration of PPy particles is below 0.8% by weight once the e-coat/PPy 0.4% by weight coating offered much higher impedance moduli compared to neat e-coat, that means an improved barrier effect (Huerta-Vilca et al, 2004;Contri et al, 2018).…”

Section: Electrochemical Tests Of Coatingsmentioning

confidence: 69%

“…In recent years, intrinsically conducting polymers (I) have attracted attention of research groups for anticorrosion applications (Hosseini et al, 2011;Gurunathan et al, 2013;Ecco, 2014;Kamaraj et al, 2015;Aravindan and Sangaranarayanan, 2016;Qiu et al, 2017;Contri et al, 2018;Chen et al, 2019). Among them, the polypyrrole (PPy) stands out mainly because of its properties, such as: ease of synthesis, low cost, control of electrical conductivity, and high stability in environmental conditions, compared to other polymers of the same class (Ramôa et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In this work, anionic surfactant DBSA was used as the secondary dopant to improve pigment dispersibility by improving pigment wetting characteristics, preventing reaggregation, and increasing the stability of the dispersion (Tracton, 2007). DBSA also is used in the PPy synthesis acting as co-dopant improving it's electrical conductivity (Ramôa et al, 2015;Contri et al, 2018;Vargas et al, 2018). To advance knowledge on the corrosion inhibition effect of PPy as well as the viability of using PPy as anticorrosive additive for e-coat water-based formulations, this paper presents the potential of PPy particles to be used as anticorrosive additive on an epoxy water-based paint in order to increase the corrosion protective property of aluminumcoated panels.…”

Section: Introductionmentioning

confidence: 99%

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Polypyrrole Modified E-Coat Paint for Corrosion Protection of Aluminum AA1200

et al. 2020

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This article reports the potential use of Polypyrrole (PPy) particles as anticorrosive additive on an epoxy water-based paint to increase the corrosion protective property of aluminum-coated panels. AA1200 aluminum panels were painted using the electrophoretic deposition method and the coatings with different concentrations of PPy particles were tested. PPy particles were synthetized by oxidative polymerization of pyrrole (Py) with iron (III) chloride hexahydrate (FeCl 3 .6H 2 O) in the presence of dodecylbenzenesulfonic acid (DBSA). Electrically conducting PPy particles (6.5 S cm −1) were obtained with a size average of 154 nm. The as-prepared PPy particles were added into a water-based epoxy paint and AA1200 panels were coated via electrophoretic deposition method. The corrosion protective properties of e-coated AA1200 panels were evaluated by means of electrochemical impedance spectroscopy over prolonged exposure time in neutral non-aerated 0.1 M sodium chloride NaCl electrolyte. In particular, the addition of 0.4% by weight PPy has improved the coating corrosion protective property with respect to epoxy clearcoat and exhibited the highest value of impedance modulus at low frequency among the studied coatings.

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“…Alam et al [160] synthesized a kind of organic-inorganic nanocomposite (PPy/GNS/RE 3+ /DBSA) involving pyrrole, graphene nanosheets (GNS), rare earth elements (RE 3+ = La 3+ , Sm 3+ , Nd 3+ ) and dodecyl benzene sulfonic acid (DBSA), and the nanocomposite coatings exhibited excellent corrosion protection for carbon steel due to their barrier and passivation behavior. Contri et al [161] found epoxy containing 5 wt.% nanostructured composites based on montmorillonite-polypyrrole exhibited high aspect ratio, easy dispersion, high electrical conductivity, high impedance and enhanced barrier property. It was concluded that epoxy/Mt-PPy was an excellent corrosion protective coating for carbon steel.…”

Section: Nanocomposite Ppy Coatingsmentioning

confidence: 99%

A Review on Conducting Polymers and Nanopolymer Composite Coatings for Steel Corrosion Protection

Zhang

2019

Coatings

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Corrosion is the principal reason for causing degradation of steel material properties, and coating is one of the most popular and effective ways to protect steel from corrosion. There are many kinds of coatings with different constituents, mechanisms and effectiveness. This paper presents a comprehensive review on the development of coating technology including traditional coatings, hydrophobic coatings, conducting polymer coatings and nanopolymer composite coatings. In particular, conducting polymers and nanopolymer composite coatings are reviewed in detail, which are the most popular and promising coatings. The advantages and limitations of each coating method as well as the influencing factors on corrosion protection are elaborated. Finally, the future research and applications are proposed.Coatings 2019, 9, 807 2 of 22 fluorocarbon coating, silicone coating, polyurethane coating and zinc-rich coating, provide corrosion protection by their barrier effect to ionic species, oxygen and water transport, which diminishes the corrosion rate [5][6][7], but their shortcomings are still significant, such as low impact strength, poor weatherability, poor bond strength and poor durability [8]. Almost all prevailing superhydrophobic coatings can adopt nanotechnology. Silica nanoparticles [9][10][11], carbon nanotubes [12,13], titanium oxide nanotubes [14][15][16][17], nanopolymers [18][19][20] and nanosilane [21][22][23] have been widely used for fabricating superhydrophobic coatings. Procedures such as the dip coating technique, electroless plating, sol-gel process and electro deposition are adopted to fabricate the superhydrophobic coatings. The water contact angles of the superhydrophobic coatings can reach 145-165 • C [9-23]. There is also some literature about using soft lithography method based on a polydimethylsiloxane (PDMS) template to prepare nanostructured superhydrophobic coatings [24,25]. Although significant progress has been achieved regarding the synthesis of superhydrophobic coatings and their anticorrosion properties for steel, the majority superhydrophobic coatings have been studied only in laboratory till now, and there are still many obstacles before they could be widely used in industry. The prevailing fabrications are complicated, costly and not suitable for on-site use. Many efforts should be made to develop an optimum superhydrophobic coating with excellent water repellency, long service life, good adhesion performance, low cost, easy fabrication and convenience in site spraying and curing.In recent years, conducting polymer coatings and nanopolymer composite coatings have been widely used in many projects. Many studies on nanopolymer composite coatings, conducting polymers and their combinations were conducted with a good deal of progress. Some new nontoxic corrosion protection materials with the properties of high efficiency and smart corrosion protection, long effective period and easy construction have been developed.Different coatings have deferent deposition mechanisms. At present, the prev...

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Epoxy coating based on montmorillonite-polypyrrole: Electrical properties and prospective application on corrosion protection of steel

Cited by 56 publications

References 32 publications

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

Development of Poly (butylene adipate-co-terephthalate) Filled with Montmorillonite-Polypyrrole for Pressure Sensor Applications

Polypyrrole Modified E-Coat Paint for Corrosion Protection of Aluminum AA1200

A Review on Conducting Polymers and Nanopolymer Composite Coatings for Steel Corrosion Protection

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