A comparative study on PMMA-TiO2 and PMMA-ZrO2 protective coatings

Harb, Samarah Vargas; Trentin, Andressa; Uvida, Mayara Carla; Magnani, Marina; Pulcinelli, Sandra Helena; Santilli, Chiara; Hammer, Peter

doi:10.1016/j.porgcoat.2019.105477

Cited by 33 publications

(29 citation statements)

References 32 publications

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“…The formed Al-O-Zr bond can enhance the adhesion of hybrid sol-gel coating on the aluminium surface (Liu et al, 2006). Note that the exact distance between silica and silicazirconia clusters and length of polymeric chains are not known and could not be determined using the methodology in the present study unlike in (Harb et al, 2020).…”

Section: Real-time Fourier Transform Infrared Spectroscopymentioning

confidence: 90%

“…The impedance data for TM and TMZ coatings were fitted using the conventional approach for sol-gel coatings (Harb et al, 2020;dos Santos et al, 2021), used also in our previous study (Rodič et al, 2018a). Electrical equivalent circuit (EECs) with three-time constants was used for TM coating and with two-time constants for TMZ coatings, following different shapes of experimental EIS spectra (Figures 6D,E).…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

“…Figure 7 shows the high energy resolution XPS Si 2p, C 1s and O 1s spectra of TM coating for the main constituting elements silicon, carbon and oxygen. The C 1s and Si 2p spectra were convoluted according to the procedure published in our previous paper (Hamulić et al, 2020) and in the literature (Hammer et al, 2012;Harb et al, 2020). First, we consider the spectra before immersion, i.e., of as-prepared coating.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

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Degradation of Sol-Gel Acrylic Coatings Based on Si and Zr Investigated Using Electrochemical Impedance, Infrared and X-Ray Photoelectron Spectroscopies

Rodič¹,

Zanna²,

Milošev³

et al. 2021

Front. Mater.

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This study aimed to synthesise and characterise two types of sol-gel acrylic coatings: one based on Si and the other based on Si and Zr. These coatings, which served as a barrier for corrosion protection of aluminium, were synthesised by sol-gel methodology using silicon precursors tetraethyl orthosilicate and organically modified silicon precursor 3-methacryloxypropyltrimethoxysilane, without and with the addition of zirconium(IV) n-propoxide chelated with methacrylic acid. The synthesis process was followed using real-time Fourier transform infrared spectroscopy, which confirmed the condensation reactions of Si–O–Si and Si–O–Zr networks, depending on the sol type. This was reflected in the composition of the coating as well, as shown by X-ray photoelectron spectroscopy. The coating topography, thickness and morphology were analysed using focused ion beam scanning electron microscopy. X-ray photoelectron spectroscopy was employed to follow the degradation of acrylic coatings upon immersion in sodium chloride solution. Corrosion properties, evaluated using electrochemical impedance spectroscopy in 0.1 M NaCl, confirmed high barrier protection of coated aluminium with acrylic coatings based on Si and even better for coating based on Si with Zr. The more durable corrosion protection of the latter was also confirmed by salt spray testing.

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Section: Real-time Fourier Transform Infrared Spectroscopymentioning

confidence: 90%

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

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Degradation of Sol-Gel Acrylic Coatings Based on Si and Zr Investigated Using Electrochemical Impedance, Infrared and X-Ray Photoelectron Spectroscopies

Rodič¹,

Zanna²,

Milošev³

et al. 2021

Front. Mater.

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“…Also, Rajeh et al [1] studied the effect of ZnO:Co, at loading ratios less than 1.0 %, on the thermal, structure, and electrical features of PMMA (50%)/PEMA (50%) blend. PMMA loaded with ZrO2 or TiO2 nanoparticles exhibited a corrosion resistance in the order of 10 10 Ω•cm 2 in solution of 3.5% NaCl, that is 7 orders of magnitude greater than that of the bare carbon steel [2]. Among the TMOs, Co3O4 is a semiconductor of p-type with a spinel structure, environmentally friendly, and has a theoretical capacitance as high as 3560 F/g [17,18].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of CuO/Co3O4/ Poly(Methyl Methacrylate) Nanocomposites Films for Optical and Dielectric Applications

El-Sayed

Sayed

2021

Preprint

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Composites of transition metal oxides (TMOs)/Polymers have many modern technological, industrial, and biological applications. Co3O4 and CuO nanoparticles (Nps) were synthesized by sol-gel. Then they doped into poly(methyl methacrylate) (PMMA) via solution casting method. The obtained Nps and nanocomposite films were then investigated using several techniques. XRD and HR-TEM indicated the high purity of Co3O4 and CuO Nps of face-centered cubic (fcc) with 58 nm average particle size (Dav), and monoclinic structure with Dav = 35 nm, respectively. The amorphous nature of PMMA was influenced after mixing with these Nps. SEM and FTIR confirmed the interaction between Nps and the polymer chains. The pure film showed transparency of about 90% and Nps addition narrowed the optical bandgap effectively while keeping the films with high transmittance. CuO is more effective than Co3O4 on the optical parameters of the films. The dielectric constant improved after adding the Nps, while all films have a low dielectric loss. Additionally, the effects of Co3O4 and CuO on the ac conductivity, Argand plots, and the dielectric modulus are reported. Our nanocomposites are considered a promising candidate for nanotechnology-based devices such as electric stress control, film capacitors and anti-reflective coating for solar cell applications.

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“…One promising class of coating systems, developed in the last decade, which fulfill the cited criteria, is organic-inorganic nanocomposites based on conventional acrylic, epoxy, and polyurethane materials combined with ceramic nanofillers, such as silica, ceria, zirconia, etc. These hybrid materials have demonstrated excellent barrier property, providing long-term protection for steel and aluminum alloys [3,[8][9][10]. The superiority of hybrid systems compared to purely polymeric phases comes from a tailored nanostructure achieved by proper amounts of inorganic nanofillers within the organic matrix and the careful tuning of synthesis conditions, resulting in a dense and homogeneous nanocomposite that acts as an efficient diffusion barrier, limiting the water uptake and diffusion of ionic species to a very low rate [11].…”

Section: Introductionmentioning

confidence: 99%

Organic-Inorganic Hybrid Coatings for Active and Passive Corrosion Protection

Trentin¹,

Harb²,

Souza³

et al. 2020

Corrosion [Working Title]

Self Cite

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Organic-inorganic coatings based on poly(methyl methacrylate) (PMMA)-silica and PMMA-cerium oxide hybrids provide effective and active corrosion protection of metallic surfaces. For both hybrid materials, the covalent conjugation of inorganic silica or ceria nanodomains with the PMMA matrix, provided by molecular coupling agents, leads to homogenous and highly cross-linked nanocomposites, which act in the form of coatings as an efficient diffusion barrier. The addition of lithium salts (500-2000 ppm) into PMMA-silica hybrid and optimized ceria fraction in PMMA-cerium oxide coatings results in active corrosion inhibition by the self-healing effect. Results of electrochemical assays of aluminum-and steel-coated samples, performed in a 3.5% NaCl solution, show an excellent corrosion resistance (impedance modulus up to 100 GΩ cm 2) and durability (up to 350 days) of the 10-μm-thick passive barrier layer. Time-of-flight secondary ion mass and X-ray photoelectron spectroscopies evidenced the self-healing ability of coatings induced by lithium/cerium ion leaching toward corrosion spots or artificial scratches, which are restored by a protective layer of precipitated phases. Results presented in this book chapter evidence the active role of lithium and cerium species in improving the hybrid structure and providing through self-healing a significantly extended service life of metallic components.

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A comparative study on PMMA-TiO2 and PMMA-ZrO2 protective coatings

Cited by 33 publications

References 32 publications

Degradation of Sol-Gel Acrylic Coatings Based on Si and Zr Investigated Using Electrochemical Impedance, Infrared and X-Ray Photoelectron Spectroscopies

Degradation of Sol-Gel Acrylic Coatings Based on Si and Zr Investigated Using Electrochemical Impedance, Infrared and X-Ray Photoelectron Spectroscopies

Preparation and Characterization of CuO/Co3O4/ Poly(Methyl Methacrylate) Nanocomposites Films for Optical and Dielectric Applications

Organic-Inorganic Hybrid Coatings for Active and Passive Corrosion Protection

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