Influence of polyaniline and cerium oxide nanoparticles on the corrosion protection properties of alkyd coating

Ecco, Luiz Gustavo; Fedel, Michele; Ahniyaz, Anwar; Deflorian, F.

doi:10.1016/j.porgcoat.2014.04.002

Cited by 50 publications

(23 citation statements)

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“…Cerium oxide (ceria, CeO 2 , CeO 2Àx ) nanoparticles are widely studied for their applications in catalysis, 1 chemical and mechanical polishing (CMP), fuel cells, 2 sun-screens, 3 infrared reective pigments, 4 UV 5-7 and corrosion protective [8][9][10] coatings and bio-medicines. [11][12][13][14] The high demand for cerium oxide nanoparticles from the CMP application especially in North America is driving the growth of the global cerium oxide nanoparticle market and the current development technology is not able to cover the increasing demand.…”

Section: Introductionmentioning

confidence: 99%

Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings

2020

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Section: Introductionmentioning

confidence: 99%

Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings

2020

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“…It was reported that the leaching of cerium ions from the oxides may react with the hydroxyl ions to form precipitates of cerium hydroxides and oxides on the metal surface, resulting in an inhibition of the cathodic oxygen reduction and a decrease in corrosion rate. [4][5][6][7][8][9][10][11][12][13][14][15][16] It was also demonstrated that the CeO 2, acting as complexing agent, can lead to the formation of a stable layer of compounds on the metal surface. 17,18 Moreover, one proposed mechanism relies on the activity of the Ce 3+ /Ce 4+ redox couple, i.e., shifting between CeO 2 and Ce 2 O 3 under oxidizing and reducing conditions.…”

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confidence: 99%

In Situ AFM and Electrochemical Study of a Waterborne Acrylic Composite Coating with CeO₂Nanoparticles for Corrosion Protection of Carbon Steel

Ecco

Ahniyaz³

et al. 2015

J. Electrochem. Soc.

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The corrosion protection of a waterborne acrylic composite coating with 1 wt% ceria nanoparticles (CeNP) coated on carbon steel in 3 wt% NaCl solution was investigated by ex-situ and in situ as well as electrochemical atomic force microscopy (AFM) observations, combined with open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) measurements. The synthesized CeNP were stabilized by acetic acid. The transmission electron microscopy characterization showed fine nano-size of as-synthesized CeNP, the ex-situ AFM imaging revealed uniform dispersion of the CeNP in the composite coating and greatly reduced nano-sized pinholes in the coating. The in situ and electrochemical (EC) AFM investigations indicate release of some CeNP and aggregates from the coating surface and then precipitation of some particles and cerium-compounds during the exposure. The OCP and EIS results demonstrated that the addition of 1 wt% CeNP leads to a significantly improved long term barrier type corrosion protection of the waterborne acrylic composite coating for carbon steel in 3 wt% NaCl solution. The beneficial effect of the CeNP is attributed to the blocking of nano-sized defects and inhibition by the cerium compounds originated from the acetic acid stabilized CeNP.Carbon steels are widely used in modern infrastructural fields, and polymer coatings are often needed for the corrosion protection. Hexavalent chromium has been extensively used for more than 60 years as anti-corrosion pigments in conversion coatings for corrosion protection. 1 However, during the last decade the use of chromatebased compounds in coatings has been highly restricted due to human health and environmental concerns, and large efforts have been devoted to develop alternatives to hexavalent chromium. Recently, the use of cerium species in conversion coatings has been explored for the corrosion protection of metals including zinc, aluminum, magnesium alloys, galvanized steel and stainless steel. Cerium-based inhibitors are becoming a promising environmentally friendly alternative to chromate used in coatings. [2][3][4] It was found that the cerium compounds reduced the rate of both the cathodic and the anodic reactions. 5,6 Waterborne-based acrylic copolymer coatings have been widely used in maintenance paints due to their excellent weatherability, hardness, water and alkali resistance. 7 These kinds of coatings are made of aqueous polymer latexes that are responsible for binding the pigments and fillers and forming a homogeneous film with good adhesion to the substrate. However, the coatings consist of acrylic-based resins and are generally not impervious to corrosive reactants such as water, oxygen and corrosive ions. 8 Their application as corrosion protection coatings for metals is limited due to the lack of permanent impenetrability, which leads to delamination and degradation of the coatings once the electrolyte solution reaches the metal-coating interface leading to corrosion of the metal. 9,10 Therefore it is necessary to develop composite ...

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“…Adding both the PAni-PA and the ceria nanoparticles in epoxy coatings could offer a synergistic effect on improving the corrosion protection properties in the NaCl solution. Ecco et al [153] found that adding 1.0 wt.% of ceria nanoparticles and PAni into the alkyd coating could remarkably reduce the delamination rate and the presence of blisters in comparison to the alkyd blank coating. Radoman et al [154] modified the TiO 2 nanoparticles surface with vitamin B6 (TiO 2 -B6) first, and then synthesized PAni in the presence of TiO 2 -B6 (PAni-TiO 2 -B6).…”

Section: Nanocomposite Pani 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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Influence of polyaniline and cerium oxide nanoparticles on the corrosion protection properties of alkyd coating

Cited by 50 publications

References 31 publications

Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings

Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings

In Situ AFM and Electrochemical Study of a Waterborne Acrylic Composite Coating with CeO₂Nanoparticles for Corrosion Protection of Carbon Steel

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

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Influence of polyaniline and cerium oxide nanoparticles on the corrosion protection properties of alkyd coating

Cited by 50 publications

References 31 publications

Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings

Solventless synthesis of cerium oxide nanoparticles and their application in UV protective clear coatings

In Situ AFM and Electrochemical Study of a Waterborne Acrylic Composite Coating with CeO2Nanoparticles for Corrosion Protection of Carbon Steel

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

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In Situ AFM and Electrochemical Study of a Waterborne Acrylic Composite Coating with CeO₂Nanoparticles for Corrosion Protection of Carbon Steel