Clay/Phosphate/Epoxy nanocomposites for enhanced coating activity towards corrosion resistance (original) (raw)
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Iranian Journal of Oil and Gas Science and Technology, 2017
Different amounts of nanoclay were incorporated into the acrylic resin matrix at 0, 1, 3, and 5 wt.% loadings. The coatings were applied on low carbon steel plates. Optical microscopy, sedimentation test, transmission electron microscopy, and X-ray diffraction were employed to investigate the dispersion of nanoclay in matrix. The corrosion resistance of coatings was evaluated by electrochemical impedance spectroscopy, polarization measurement, and salt spray test. In addition, pull-off and cross-cut tests were used for the assessment of coating adhesion to the substrate. The results indicated that the anti-corrosive properties of the acrylic resin were obviously increased by the addition of nanoclay. The nanocomposite coatings containing 3 wt.% clay showed the best corrosion resistance. Finally, the nanocomposites containing 1 and 3 wt.% showed the highest adhesion to the substrate.
Corrosion Science, 2015
Surface modification of nanoclay particles was carried out by various amounts of polyesteramide hyperbranched polymer (HBP). Thermal gravimetric analysis and X-ray diffraction analysis were performed to estimate the efficiency of the HPB grafting on the clay particles. Epoxy/clay nanocomposites were prepared by addition of 1 wt.% unmodified and modified clays. The corrosion protection properties of the nanocomposites were evaluated by electrochemical impedance spectroscopy (EIS). Results revealed that surface modification of the clay particles by HBP caused significant enhancement of the epoxy coating corrosion resistance especially when the 'polymer/clay' ratios were 10/1 and 5/1.
International Journal of Electrochemical Science
In this work Polyamide/organic clay nanocomposite (PCN) was successfully prepared. The raw clay was collected from Khulays area north of Jeddah in Saudi Arabia. After grinding, it was washed with water, thereafter it was saturated with 0.5M NaCl solution to obtain the sodium clay (NaC). To obtain the organoclay (OC), the NaC was modified with Cetylpyridinium chloride (CPC). Polyamide6/organoclay nanocomposites (PA6/OC NCs) were prepared at 1,2,3,4 and 5 wt% of OC. The PA6/OC nanocomposites were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning electron microscope (SEM) as well as transmission electron microscope (TEM). The FT-IR spectra of OC show the appearance of new bands of the constituents of CPC which gives an evidence for the presence of the organic component CPC in the OC structure. The XRD results for OC showed a shift in d001 spacing from 10.93 Å for NaC to 20.63 Å for OC. The XRD results for PA6/OC nanocomposites showed the loss of the clay crystalline structure at the low clay loading of 1-3 wt%. From TEM results, the PA6/OC nanocomposites at 1, 2, and 3wt% of OC showed exfoliated structures while the 4 and 5wt% showed small portion of intercalated structure. The SEM results for the OC and PA6/OC showed a good homogeneous mixture in the PA6/OC nanocomposites. The anticorrosive properties of PA6/OC nanocomposites coatings on C-Steel were investigated using electrochemical impedance spectroscopy (EIS) and Potentiodynamic polarization in 3.5 wt% NaCl electrolyte. Results showed that the PA6/OC nanocomposite coatings have better corrosion protection of C-Steel than pure PA6. The PA6/OC nanocomposite coatings containing 5wt% of the OC exhibited the best corrosion protection which reached about 75%.
Characterization of corrosion resistant clay/epoxy ester composite coatings and thin films
Progress in Organic Coatings, 2012
The processibility and corrosion resistance of epoxy ester coatings was improved by the addition of cloisite 15A clay. The weight percent of clay was increased from 1% to 10% of clay. The presence of clay in the coatings was confirmed by using the Fourier transformed infrared spectroscopy, FTIR. The effect of clay on the contact angle of the coatings was determined by using the video contact angle analyzer. The surface contact angle of the coatings decreased with increasing weight percent of clay. The surface roughness as measured by atomic force microscope, AFM decreased with the addition of clay up to 1 wt.% loading. The dynamic mechanical property of the coatings was determined by using the Seiko Dynamic Mechanical Spectrometer, DMS. The reinforcement of epoxy ester with organoclay resulted in a significant increase in the glass transition temperature, Tg. However, there was no significant change in the height of the tangent of the loss angle, tan ı with variation in the clay concentration, indicating that there was no significant change in the damping behavior of the epoxy ester coatings as a result of reinforcement by organoclay.
Synthesis and characterization of a nanocomposite anti-corrosion waterborne epoxy coating
Progress in Organic Coatings
Polymer nanocomposites (NSPANI/AuNP/GR) based on nanostructured polyaniline, gold nanoparticles (AuNP) and graphene nanosheets (GR) have been synthesized using in situ polymerization. A series of nanocomposites have been synthesized by varying the concentration of GR and chloroauric acid to optimize the formulation with respect to the electrochemical activities. Out of these series of NSPANI/AuNP/GR nanocomposites, it has been found that only one particular nanocomposite has the best electrochemical properties, as analyzed by cyclic voltammetry (CV) and differential pulse voltammetry and conductivity. The best nanocomposite has been characterized by Fourier transform infrared Raman spectroscopy, UV-vis spectroscopy, X-ray diffraction studies, transmission electron microscopy, scanning electron microscopy and atomic force microscopy. The CV of the best nanocomposites show the well-defined reversible redox peaks characteristic of polyaniline, confirming that the polymer maintains its electro activity in the nanocomposites. Another nanocomposite has been prepared with identical composition (as found with the best nanocomposite) by mixing of presynthesized nanostructured polyaniline with chloroauric acid and graphene dispersion in order to predict the mechanism of in situ polymerization. It is inferred that the nanocomposite prepared by blending technique loses its property within 48 h indicating phase separation whereas the nanocomposite prepared by in situ technique is highly stable.
International Journal of Corrosion, 2018
Silica/Polypyrrole nanocomposites (SiO2/PPy) incorporating oxalate as counter anion (SiO2/PPyOx) were chemically polymerized in the solution with the presence of pyrrole, silica, and sodium oxalate. Nanocomposites SiO2/PPyOx at different concentrations of oxalate anion were characterized with FTIR, XRD, EDX, TGA, and TEM. The corrosion protective properties for carbon steel of nanocomposites in epoxy coating were studied by electrochemical techniques including electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP). FTIR results of nanocomposites show a slightly red-shift in terms of wavelength compared with the case of PPy and SiO2 spectra. It may be due to a better conjugation and interactions between PPy and SiO2 in nanocomposite structure. TEM image indicated that nanocomposites have spherical morphologies with diameters between 100 and 150 nm. The EIS results showed that |Z| modulus values of epoxy coatings containing SiO2/PPyOx composites reached about 10...
Protection of Metals and Physical Chemistry of Surfaces, 2019
Montmorillonite organoclay, in different amounts (between 1 to 5 wt %), was incorporated into the petrolatum using mechanical stirring and sonication process. Anti-corrosive properties of the compounded nanocomposites were investigated using salt spray and electrochemical impedance spectroscopy (EIS) methods. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy analysis (EDX) showed that the interlayer spacing of clays was increased after addition of petrolatum resin along with applying shear force and ultrasounication. Electrochemical analyses showed improvement in the barrier and anti-corrosive characteristics of formulated nanocomposite coatings. The best performance of formulated coatings was achieved with coating containing 1 wt % clay concentration.
Polymers
Polymer–Clay Nanocomposite (PCN) coatings were prepared using the solution intercalation method. The raw Khulays clay was treated with NaCl to produce sodium clay (NaC). Thereafter, Cetyl Pyridinium Chloride (CPC) was used to convert NaC into the organic clay form (OC). PCN was prepared by adding polystyrene as the matrix to different weights of OC to prepare 1 wt.% and 3 wt.% PCN. To enhance the coating protection of C-steel in NaCl solution, PCN coatings were added to microcapsules loaded with some corrosion inhibitors PCN (MC). The microcapsules are prepared by the encapsulation of rare-earth metal Ce+3 ions and Isobutyl silanol into polystyrene via the Double Emulsion Solvent Evaporation (DESE) technique. Characterization techniques such as FTIR, X-Ray Diffraction (XRD), and Transmission Electron Microscopy (TEM) were employed. FTIR confirmed the success of the preparation, while XRD and TEM revealed an intercalated structure of 1 wt.% PCN while 3 wt.% PCN has a fully exfoliated...
Progress in Organic Coatings, 2018
In this study, nanostructured composite based on Montmorillonite-Polypyrrole (Mt-PPy) was prepared via in situ chemical polymerization of Pyrrole in presence of Mt and dodecyl benzene sulfonic acid (DBSA). Subsequently, the as-prepared Mt-PPy additive as well as pure Mt and PPy were incorporated into an epoxy coating as anticorrosive protection additives for low carbon steel. The electrical conductivity, chemical changes and microstructure of the as-prepared electrically conductive additives were investigated. Steel coated specimens were prepared via solvent cast method and the anticorrosion protection ability of the coatings was evaluated by means of electrochemical impedance spectroscopy (EIS). Likewise, surface features of the coatings such as contact angle and roughness were examined. Due to the higher aspect ratio and ease of dispersion of Mt-PPy epoxy coatings loaded with Mt-PPy additives exhibited higher electrical conductivity values with respect to those containing merely PPy. Besides, contact angle (CA) between deionized water and Epoxy/Mt-PPy coated carbon steel was higher than CA for neat epoxy whereas CA of Epoxy/PPy and Epoxy/Mt were significantly reduced. EIS measurements revealed higher impedance values for Epoxy/Mt-PPy coating; the outputs of EIS suggested enhanced barrier property of epoxy coating when Mt-PPy additive was added. The results observed in this study are pointing towards the prospective use of the Epoxy/Mt-PPy with 5 wt% content as a corrosion protective coating for carbon steel.