The Experts below are selected from a list of 891015 Experts worldwide ranked by ideXlab platform
A S Khanna - One of the best experts on this subject based on the ideXlab platform.
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Functional Coatings by Incorporating Nanoparticles
2015Co-Authors: Swati Gaur, A S KhannaAbstract:Use of nanoparticle addition in coatings has been described to formulate selfhealing and antifouling coatings. The first step in both these cases was to create a hydrophobic surface for which a highly reactive fluoro silane was used. The second property in each case was achieved by the addition of nano-particles. In self-cleaning coatings, easy sliding of water droplet was achieved by the addition of nano-ZnO and nano-silica, while, in the case of anti-fouling coating, this was achieved by addition nano silica, which provided a nano-roughness surface, which was so smooth to avoid sticking any barnacles or seaweeds.
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Effect of nano-Al_2O_3 particles on the corrosion behavior of alkyd based waterborne coatings
Journal of Coatings Technology and Research, 2009Co-Authors: Shailesh K Dhoke, T. Jai Mangal Sinha, A S KhannaAbstract:A modification in the alkyd based waterborne coatings was studied with the addition of 0.05%, 0.1%, 0.2%, and 0.3% nano-Al_2O_3. Corrosion performance of the nano-composite coatings were evaluated by applying these nanocomposites on mild steel substrate and exposing them to salt spray, humidity, and accelerated weathering. Mechanical properties were studied by subjecting the coating to scratch and abrasion test. The results showed that, with an increase in the concentration of nano-Al_2O_3 there was an improvement in the corrosion resistance, UV resistance, and mechanical properties of the coatings indicating the positive effect of addition of nano-Al_2O_3 particles in the coatings. Further, the transparency of the coating was not altered, maintaining the optical clarity of the coating.
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effect of nano zno particles on the corrosion behavior of alkyd based waterborne coatings
Progress in Organic Coatings, 2009Co-Authors: Shailesh K Dhoke, A S Khanna, Jai Mangal T SinhaAbstract:A modification in the alkyd based waterborne coatings was studied with the addition of 0.05%, 0.1%, 0.2%, and 0.3% nano-Al2O3. Corrosion performance of the nano-composite coatings were evaluated by applying these nanocomposites on mild steel substrate and exposing them to salt spray, humidity, and accelerated weathering. Mechanical properties were studied by subjecting the coating to scratch and abrasion test. The results showed that, with an increase in the concentration of nano-Al2O3 there was an improvement in the corrosion resistance, UV resistance, and mechanical properties of the coatings indicating the positive effect of addition of nano-Al2O3 particles in the coatings. Further, the transparency of the coating was not altered, maintaining the optical clarity of the coating.
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effect of nano fe2o3 particles on the corrosion behavior of alkyd based waterborne coatings
Corrosion Science, 2009Co-Authors: Shailesh K Dhoke, A S KhannaAbstract:A nano-composite coating was formed by adding nano-Fe2O3 to a specially developed alkyd based waterborne coating system. The interaction of nano-particles with the polymer functionalities was confirmed using FTIR. Curing behavior of the coating was determined by DSC. The uniformity of coating and dispersion of nano-particles in the polymer matrix was investigated using SEM and AFM. The performance of the coating was investigated in terms of their corrosion resistance, UV-resistance, mechanical properties and optical properties. Composite coatings so formed showed enhanced, corrosion resistance, better mechanical properties such as abrasion and scratch hardness and improved UV blocking properties.
Shailesh K Dhoke - One of the best experts on this subject based on the ideXlab platform.
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Effect of nano-Al_2O_3 particles on the corrosion behavior of alkyd based waterborne coatings
Journal of Coatings Technology and Research, 2009Co-Authors: Shailesh K Dhoke, T. Jai Mangal Sinha, A S KhannaAbstract:A modification in the alkyd based waterborne coatings was studied with the addition of 0.05%, 0.1%, 0.2%, and 0.3% nano-Al_2O_3. Corrosion performance of the nano-composite coatings were evaluated by applying these nanocomposites on mild steel substrate and exposing them to salt spray, humidity, and accelerated weathering. Mechanical properties were studied by subjecting the coating to scratch and abrasion test. The results showed that, with an increase in the concentration of nano-Al_2O_3 there was an improvement in the corrosion resistance, UV resistance, and mechanical properties of the coatings indicating the positive effect of addition of nano-Al_2O_3 particles in the coatings. Further, the transparency of the coating was not altered, maintaining the optical clarity of the coating.
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effect of nano zno particles on the corrosion behavior of alkyd based waterborne coatings
Progress in Organic Coatings, 2009Co-Authors: Shailesh K Dhoke, A S Khanna, Jai Mangal T SinhaAbstract:A modification in the alkyd based waterborne coatings was studied with the addition of 0.05%, 0.1%, 0.2%, and 0.3% nano-Al2O3. Corrosion performance of the nano-composite coatings were evaluated by applying these nanocomposites on mild steel substrate and exposing them to salt spray, humidity, and accelerated weathering. Mechanical properties were studied by subjecting the coating to scratch and abrasion test. The results showed that, with an increase in the concentration of nano-Al2O3 there was an improvement in the corrosion resistance, UV resistance, and mechanical properties of the coatings indicating the positive effect of addition of nano-Al2O3 particles in the coatings. Further, the transparency of the coating was not altered, maintaining the optical clarity of the coating.
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effect of nano fe2o3 particles on the corrosion behavior of alkyd based waterborne coatings
Corrosion Science, 2009Co-Authors: Shailesh K Dhoke, A S KhannaAbstract:A nano-composite coating was formed by adding nano-Fe2O3 to a specially developed alkyd based waterborne coating system. The interaction of nano-particles with the polymer functionalities was confirmed using FTIR. Curing behavior of the coating was determined by DSC. The uniformity of coating and dispersion of nano-particles in the polymer matrix was investigated using SEM and AFM. The performance of the coating was investigated in terms of their corrosion resistance, UV-resistance, mechanical properties and optical properties. Composite coatings so formed showed enhanced, corrosion resistance, better mechanical properties such as abrasion and scratch hardness and improved UV blocking properties.
S Devikala - One of the best experts on this subject based on the ideXlab platform.
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development of nano sio2 incorporated nano zinc phosphate coatings on mild steel
Applied Surface Science, 2015Co-Authors: M Tamilselvi, M Arthanareeswari, S Devikala, P Kamaraj, Arockia J SelviAbstract:Abstract This paper reports the development of nano SiO 2 incorporated nano zinc phosphate coatings on mild steel at low temperature for achieving better corrosion protection. A new formulation of phosphating bath at low temperature with nano SiO 2 was attempted to explore the possibilities of development of nano zinc phosphate coatings on mild steel with improved corrosion resistance. The coatings developed were studied by Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDX), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Electrochemical measurements. Significant variation in the coating weight, morphology and corrosion resistance was observed as nano SiO 2 concentrations varied from 0.5–4 g/L. The results showed that, the nano SiO 2 in the phosphating solution changed the initial potential of the interface between mild steel substrate and phosphating solution and reduce the activation energy of the phosphating process, increase the nucleation sites and yielded zinc phosphate coatings of higher coating weight, greater surface coverage and enhanced corrosion resistance. Better corrosion resistance was observed for coatings derived from phosphating bath containing 1.5 g/L nano SiO 2 . The new formulation reported in the present study was free from Ni or Mn salts and had very low concentration of sodium nitrite (0.4 g/L) as accelerator.
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nano zinc phosphate coatings for enhanced corrosion resistance of mild steel
Applied Surface Science, 2015Co-Authors: M Tamilselvi, M Arthanareeswari, P Kamaraj, S DevikalaAbstract:Abstract Nano crystalline zinc phosphate coatings were developed on mild steel surface using nano zinc oxide particles. The chemical composition and morphology of the coatings were analyzed by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The particles size of the nano zinc phosphate coating developed was also characterized by TEM analysis. Potentiodynamic polarization and electrochemical impedance studies were carried out in 3.5% NaCl solution. Significant variations in the coating weight, morphology and corrosion resistance were observed as nano ZnO concentrations were varied from 0.25 to 2 g/L in the phosphating baths. The results showed that nano ZnO particles in the phosphating solution yielded phosphate coatings of higher coating weight, greater surface coverage and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal ZnO particles in the phosphating baths). Better corrosion resistance was observed for coatings derived from phosphating bath containing 1.5 g/L nano ZnO. The activation effect brought about by the nano ZnO reduces the amount of accelerator (NaNO 2 ) required for phosphating.
Wei Gao - One of the best experts on this subject based on the ideXlab platform.
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Electrochemical studies of sol-enhanced Zn–Ni–Al2O3 composite and Zn–Ni alloy coatings
Journal of Electroanalytical Chemistry, 2015Co-Authors: Soroor Ghaziof, Paul A. Kilmartin, Wei GaoAbstract:Abstract Zn–Ni–Al 2 O 3 nano-composite coatings were electrodeposited on mild steel using a novel sol enhanced electroplating method. The effect of alumina sol on the electrodeposition process, and coating properties was investigated using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. The results indicated that the electro-crystallization processes of Zn–Ni and Zn–Ni–Al 2 O 3 were governed by a three-dimensional nucleation process controlled by diffusion. Evaluation of nucleation mode in the presence and absence of alumina sol showed that the progressive nucleation was predominant for the Zn–Ni alloy deposit. However, for the Zn–Ni composite coating, the nucleation mode was closer to instantaneous nucleation. Nucleation parameters such as density of active nucleation sites and nucleation rate were increased in the presence of alumina nano-particles in the bath. Zn–Ni–Al 2 O 3 nano composite coatings produced more uniform and compact deposits, with fine grained microstructure when compared to Zn–Ni coatings. XRD results showed that the phase structure of both alloy and composite coatings was single Ni 5 Zn 21 -γ phase, and that the incorporation of alumina in the Zn–Ni coating refined the crystal grain size.
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a novel electroless plating of ni p tio2 nano composite coatings
Surface & Coatings Technology, 2010Co-Authors: Weiwei Chen, Wei Gao, Yedong HeAbstract:Abstract A new processing concept has been developed to produce nano-structured metal-matrix composite coatings. This method combines sol-gel and electroless plating techniques to prepare highly dispersive oxide nano-particle reinforced composite coatings. Transparent TiO2 sol was added into the standard electroless plated Ni–P solution at a controlled rate to produce Ni–P–TiO2 nano-composite coatings on Mg alloys. The coating was found to have a crystalline structure. The nano-sized TiO2 particles (∼ 15 nm) were well dispersed into the Ni–P coating matrix during the co-deposition process. This technique can effectively avoid the agglomeration of nano-particles in the coating matrix. As a result, the microhardness of the composite coatings were significantly increased to ∼ 1025 HV200 compared to ∼ 710 HV200 of the conventional composite coatings produced with solid particle mixing methods. Correspondingly, the wear resistance of the new composite coatings was also greatly improved.
M Tamilselvi - One of the best experts on this subject based on the ideXlab platform.
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development of nano sio2 incorporated nano zinc phosphate coatings on mild steel
Applied Surface Science, 2015Co-Authors: M Tamilselvi, M Arthanareeswari, S Devikala, P Kamaraj, Arockia J SelviAbstract:Abstract This paper reports the development of nano SiO 2 incorporated nano zinc phosphate coatings on mild steel at low temperature for achieving better corrosion protection. A new formulation of phosphating bath at low temperature with nano SiO 2 was attempted to explore the possibilities of development of nano zinc phosphate coatings on mild steel with improved corrosion resistance. The coatings developed were studied by Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDX), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Electrochemical measurements. Significant variation in the coating weight, morphology and corrosion resistance was observed as nano SiO 2 concentrations varied from 0.5–4 g/L. The results showed that, the nano SiO 2 in the phosphating solution changed the initial potential of the interface between mild steel substrate and phosphating solution and reduce the activation energy of the phosphating process, increase the nucleation sites and yielded zinc phosphate coatings of higher coating weight, greater surface coverage and enhanced corrosion resistance. Better corrosion resistance was observed for coatings derived from phosphating bath containing 1.5 g/L nano SiO 2 . The new formulation reported in the present study was free from Ni or Mn salts and had very low concentration of sodium nitrite (0.4 g/L) as accelerator.
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nano zinc phosphate coatings for enhanced corrosion resistance of mild steel
Applied Surface Science, 2015Co-Authors: M Tamilselvi, M Arthanareeswari, P Kamaraj, S DevikalaAbstract:Abstract Nano crystalline zinc phosphate coatings were developed on mild steel surface using nano zinc oxide particles. The chemical composition and morphology of the coatings were analyzed by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The particles size of the nano zinc phosphate coating developed was also characterized by TEM analysis. Potentiodynamic polarization and electrochemical impedance studies were carried out in 3.5% NaCl solution. Significant variations in the coating weight, morphology and corrosion resistance were observed as nano ZnO concentrations were varied from 0.25 to 2 g/L in the phosphating baths. The results showed that nano ZnO particles in the phosphating solution yielded phosphate coatings of higher coating weight, greater surface coverage and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal ZnO particles in the phosphating baths). Better corrosion resistance was observed for coatings derived from phosphating bath containing 1.5 g/L nano ZnO. The activation effect brought about by the nano ZnO reduces the amount of accelerator (NaNO 2 ) required for phosphating.
