Hybrid Nanocomposite Coatings Research Articles

One-step nanoencapsulation of essential oils and their application in hybrid coatings: A sustainable long-lasting treatment of stone materials against biodeterioration

In this study, two essential oils (EOs) with preventive proved biocidal efficacy, namely oregano and eugenol, are encapsulated in silica nanocontainer, then dispersed in multifunctional, hybrid and nanocomposite coating. The aim of this work is to reduce toxicity of restoration materials, to avoid the chemicals dispersion in the environment and to extent stone protection treatments, preventing biofouling.Composite silica nanocapsules, containing separately the two EOs, are prepared via one-step synthesis, based on oil-in-water miniemulsion polymerisation processes, and fully characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 physisorption (BET/BJH). Micro-Raman spectroscopy (RS) and thermal analysis (TG/DSC).In a second step, nanocomposite coatings, based on a flexible tetraethyl orthosilicate (TEOS) matrix, are synthesised dispersing TiO2 nanoparticles and the two silica nanocapsules incorporating EOs. The coatings were applied on three different lithotypes samples of historical importance: brick, piperine and mortar. The effectiveness and compatibility of the coating formulation with the different stone substrates were assessed through a multi-analytical standard protocol.The silica nanocapsules, show monodispersed spherical shape with size ∼110 nm, a core-shell structure, a BET surface area of 600–700 m2/g and high loading capacity.The results on coatings characterisation show a crack-free and transparent structure. Moreover, the tests on applied coatings reveal the high hydrophobicity of the treated stone samples (static contact angle in the range ∼ 130–140° and reduction of liquid water capillary absorption 97–99 %) and unaltered permeability to water vapour (density of water vapour flow rate in the range 150–200 g/m2·d), demonstrating the suitability of the nanocomposite hybrid coatings for the application in stone protection against biodeterioration.

Development and electrochemical investigations of enhanced corrosion-resistant Polyvinylcarbazole-TiO2 hybrid nanocomposite coatings on 316L SS for marine applications

The present study focuses on evaluating the corrosion resistance of 316L stainless steel substrates with Polyvinylcarbazole (PVK)/TiO2 hybrid nanocomposite coatings (HNC). Using the chronoamperometry approach, the HNC were electrochemically synthesized on 316L stainless steel substrates, incorporating various weight (%) 1 %, 2 %, 3 % of TiO2 nanoparticles into the PVK matrix. The findings of the surface morphology investigation verified that the 316L SS had a dense and smooth PVK/TiO2 coating. A low surface roughness and high contact value of the PVK/TiO2 coatings are also responsible for the decrease in corrosion rate of the 316L SS. The corrosion protection efficiency of the PVK/TiO2 HNC were investigated through open circuit potential (OCP) measurement, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) analysis in 3.5 wt% NaCl solution. The corrosion rate obtained from the polarization studies of the HNC coatings as follows PVKT-2 < PVKT-3 < PVKT-1 < PVK < 316L SS. Results revealed that an optimal loading of 2 wt% TiO2 nanoparticles significantly enhanced the corrosion resistance of the coating. The enhanced electrochemical impedance response for PVK/TiO2 coatings was verified by EIS experiments. The study demonstrates that the incorporation of TiO2 nanoparticles into the PVK matrix effectively creates a barrier layer at the coating-metal interface, inhibiting the entry of aggressive ions. Microhardness studies revealed the increase in hardness value of the PVK and PVK/TiO2 coatings indicated the protective nature of the coating and provided high mechanical strength to 316L SS. The tape adhesion tests carried out on the coated specimens also indicated a good adhesion of the PVK/TiO2 on the 316L SS surface.

Wear, thermal, corrosion, and physical properties of novel UV-cured nanocomposite hybrid coatings with fluorine-containing silica networks

Wear, thermal, corrosion, and physical properties of novel UV-cured nanocomposite hybrid coatings with fluorine-containing silica networks

Mulberry-paper-based electrodes with hybrid nanocomposite coatings and their application to eco-friendly energy-storage devices

Mulberry-paper-based electrodes with hybrid nanocomposite coatings and their application to eco-friendly energy-storage devices

Room temperature cured silver nanoparticle embedded hybrid nanocomposite coatings: processing and property evaluation

In situ formation of silver nanoparticles in an inorganic–organic hybrid matrix cured at room temperature (30 ± 5 °C).

Advanced Anticorrosive Graphene Oxide-Doped Organic-Inorganic Hybrid Nanocomposite Coating Derived from Leucaena leucocephala Oil.

Metal corrosion poses a substantial economic challenge in a technologically advanced world. In this study, novel environmentally friendly anticorrosive graphene oxide (GO)-doped organic-inorganic hybrid polyurethane (LFAOIH@GO-PU) nanocomposite coatings were developed from Leucaena leucocephala oil (LLO). The formulation was produced by the amidation reaction of LLO to form diol fatty amide followed by the reaction of tetraethoxysilane (TEOS) and a dispersion of GOx (X = 0.25, 0.50, and 0.75 wt%) along with the reaction of isophorane diisocyanate (IPDI) (25-40 wt%) to form LFAOIH@GOx-PU35 nanocomposites. The synthesized materials were characterized by Fourier transform infrared spectroscopy (FTIR); 1H, 13C, and 29Si nuclear magnetic resonance; and X-ray photoelectron spectroscopy. A detailed examination of LFAOIH@GO0.5-PU35 morphology was conducted using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. These studies revealed distinctive surface roughness features along with a contact angle of around 88 G.U preserving their structural integrity at temperatures of up to 235 °C with minimal loading of GO. Additionally, improved mechanical properties, including scratch hardness (3 kg), pencil hardness (5H), impact resistance, bending, gloss value (79), crosshatch adhesion, and thickness were evaluated with the dispersion of GO. Electrochemical corrosion studies, involving Nyquist, Bode, and Tafel plots, provided clear evidence of the outstanding anticorrosion performance of the coatings.

Mechanistic origins of corrosion protection of aluminum alloys by graphene/polyetherimide nanocomposite coatings

Light-weighting vehicular components through adoption of light-metal structural alloys holds promise for reducing the fuel consumption of internal combustion engine vehicles and increasing the range of battery electric vehicles. However, the alloyed microstructure and surface precipitates of aluminum alloys render these materials susceptible to corrosion under modest excursions from neutral pH. Traditional chromium-based anodic passivation layers are subject to increasingly stringent environmental regulations, whereas options for sacrificial cathodic films are sparse for electropositive metals. While hybrid nanocomposite coatings have shown initial promise, mechanistic underpinnings remain poorly understood. Here, a fully imidized polyetherimide (PEI) resin is utilized as the continuous phase with inclusion of unfunctionalized exfoliated graphite (UFG). A comprehensive investigation of the mechanisms of corrosion protection reveals key fundamental design principles underpinning corrosion inhibition. First, strong interfacial adhesion, which for PEI is facilitated by binding of imide carbonyl moieties to Lewis acidic sites on Al surfaces. Second, the miscibility of ion-impervious nanoscopic UFG fillers and stabilization of a substantial interphase region at UFG/PEI boundaries that result in minimizing the free volume at the filler/polymer interface. Finally, extended tortuosity of ion diffusion pathways imbued by the below-percolation-threshold 2D fillers. These three design principles help govern and modulate ion transport from electrolyte/coating interfaces to the coating/metal interface and are crucial for the extended preservation of barrier properties. The results suggest an approach to systematically activate multiple modes of corrosion inhibition through rational design of hybrid nanocomposite coatings across hard-to-abate sectors where light metal alloys are likely to play an increasingly prominent role.

Improvement of active/passive anti-corrosion/weathering properties of epoxy-siloxane structure via cloisite 30B/polyaniline inclusion as new hybrid nanocomposite coatings

Researches in the corrosion protection field have been led to various mechanisms for protecting metals in harsh media as well as several efficient anti-corrosion materials. For instance, some studies have suggested clay nanolayers as an active barrier filler for coating protected systems and others have figured out polyaniline as an anti-corrosive pigment. However, no study has thoroughly examined these two additives alongside each other and compared their mechanical, anti-corrosion and anti-weathering performances. In this study, two different mechanisms of active barrier and passive behaviors were compared through epoxy-siloxane reinforcement by divergent contents of 1–4 wt% of Cloisite 30B nanoplatelets (CN) and 0.25–1 wt% of polyaniline emeraldine base (PEB) particles. Also, the effect of CN and PEB particles on corrosion, weathering resistances, and mechanical properties of epoxy-siloxane based hybrid nanocomposite matrix was explored as novel effective/potent functional coatings applied on the mild steel substrate. In this regard, the proper dispersion of additives was characterized by XRD, optical microscopy, and HRTEM. Anti-corrosion properties of the system were assessed via EIS and salt spray examinations. According to the significant effect of mechanical properties on the protection and overall performance of coatings, they were studied through Pull-Off, DMTA, and impact tests. Q-UV test, AFM, and color spectroscopy were utilized for analyzing the weathering resistance of samples. Results indicated that 2 wt% CN and 0.75 wt% PEB has the best anti-corrosion performance as well as desirable resistance against destructive atmospheric agents. Overall, in comparison, the CN nanosheets possessed higher anti-corrosion behavior as a potent barrier function, whereas the PEB showed dominant weathering resistance via an impressive passivation feature.

Using the hybrid composites as coating layers to inhibit the chemical corrosion in oil mineral reservoirs

This work aims to the identify level of hybrid nanocomposite coatings of a stainless steel alloy that is used in the manufacture of mineral reservoirs for the storage of oil products in the oil products distribution company (Opdc). Corrosion is one of modern society's most serious engineering problems where losses incurred due to it each year are estimated at billions of dollars. Technological options have to be exercised to protect against corrosion and an effort to combat these losses. To overcome this severe problem, several successful efforts have been made using corrosion inhibitors. Corrosion inhibitors are compounds used in low concentrations to prevent or slow down the corrosion process. The used metal (low carbon steel St-37) was coated with zinc phosphate as an initial layer, cellulose nitrate reinforced with MgO nanopowder by weight percentage (3 wt. %) as an intermediate layer, and epoxy resin reinforced with weight reinforcement percentage (2 wt. %) of particles (MgO+coke coal (1:1)) as a final layer. In addition, a cognitive scale was prepared from (hardness, adhesion strength, chemical corrosion test as well as electrochemical corrosion test. It was found the hardness increased with coated by an initial layer and the value of adhesion strength of triple coating layers was (232 Psi). Chemical and electrochemical corrosion tests have shown the efficiency of prepared coating layers in corrosion inhibiting and metal protection. The used inhibitors in the work are inexpensive materials that allow solving the problem of rational nature management by reducing corrosion and providing the transition to the use of environmentally safe efficient technologies

Hybrid nanocomposite coatings from PEDOT and BN-TiO2 nanosheets: Enhanced invitro corrosion resistance, wettability and biocompatibility for biomedical applications

The aim of this study is to develop the polymer nanocomposite coatings based on conducting polymer and hexagonal boron nitride (BN) nanosheets to improve invitro corrosion resistance and biocompatibility of 316L stainless steel (SS) implants. To achieve the highly dispersible BN, the surface of BN was decorated with TiO2 nanoparticles (~25 nm) and then, the resultant BN-TiO2 nanosheets was incorporated into poly (3,4-ethylene dioxythiophene) (PEDOT) coatings. Surface and structural characterization results validated the formation of nanocomposite coatings with homogeneous distribution of BN-TiO2 as well the existing interaction between the BN-TiO2 and PEDOT matrix. Invitro corrosion analysis of coated 316L SS specimens in simulated body fluid corroborated that the value of corrosion current density (0.0248 μA/cm2) was two orders of magnitude with a lower corrosion rate of 1.4694 × 10−3 mmpy for PEDOT/BN-TiO2 nanocomposite coatings compared with the pure PEDOT. Uncoated 316L SS specimen showed water contact angle (WCA) value of 84.50°, whereas PEDOT/BN-TiO2 coatings displayed WCA value of about 20°, further inferring the positive role of BN-TiO2 in the PEDOT matrix. Invitro cell culture analysis on MG63 cells validated the enhanced biocompatibility of developed nanocomposite coatings. Among the studied samples, the PEDOT/10BN-TiO2 nanocomposite coatings demonstrated enhanced wettability, invitro corrosion resistance, and ability to facilitate osteoblast adhesion. The obtained results suggest that the developed nanocomposite coatings on 316L SS implants have the potential for use in orthopedic applications.

Antibacterial performance of hybrid nanocomposite coatings containing clay and silver nanoparticles

The performance of biocide-based coatings for health care applications, using the drug delivery method, depends primarily on the diffusive properties of storage material. When the active component is ionic silver, supplied from silver nanoparticles, an additional dissolution step must occur in the bulk of the storage material. This article presents the silver release behavior of organic-inorganic sol-gel hybrid coatings and the effect of clay-nanoparticle composite, added in the sol-type formulation. Hybrid coatings were synthesized from the hydrolytic condensation of (3-glycidoxypropyl)-trimethoxysilane (GPTMS) and tetraethoxysilane in acidic media. Clay nanoparticles, previously silanized with GPTMS, and silver nitrate were used as additives in sol-gel formulations, alternatively. Coatings were deposited on microscope glass slides by the dip-coating process at a constant withdrawal rate and densified at 150 °C. Through small angle X-ray scattering from a synchrotronic source, and transmission electron microscopy, the structure of hybrid matrix, silver nanoparticles morphology and the storability behavior of silver nanoparticles under leaching conditions was analyzed. Silver releasing process was analyzed by following the evolution of silver nanoparticles remaining in the coatings, by UV–visible spectroscopy, and the increase of silver ions in the liquid medium, using inductively coupled plasma with optical emission spectroscopy. Microbiological studies showed that the lixiviated silver exhibited inhibitory properties against E. coli in LB broth. The clay nanoparticles worked as a stabilizing agent avoiding the agglomeration of silver both on the sols and on the surface of the thermally densified coatings

Optimal cutting state predictions in internal turning operation with nano-SiC/GFRE composite layered boring tools

This paper presents passive vibration control methodology in internal turning process with the use of hybrid nanocomposite coatings (nano-SiC/GFRE) on the surface of boring bar. Natural frequencies and damping ratio of different composition tool holders are obtained experimentally using impact hammer test. Three different configuration considered are: conventional (tool holder 1); nano-SiC/GFRE with 1% SiC (tool holder 2); and nano-SiC/GFRE with 2% SiC (tool holder 3). A better damping ability is noticed in third configuration of tool holder compared to others. Furthermore, using single mode data, analytical stability lobe diagrams are constructed for all three tool holders. Moreover, Box-Behnken design (BBD) is adopted and a set of fifteen experiments are performed with each tool holder. For third configuration of tool holder, effect of input variables on the surface roughness and tool vibration amplitudes is studied using neural network model. Finally, the neural network regression model is employed as a function estimation tool in simulated annealing for obtaining optimal cutting conditions.

Tribological characterization of epoxy hybrid nanocomposite coatings reinforced with graphene oxide and titania

Epoxies in the form of bulk and coatings have been used throughout the years for a wide spectrum of applications in industries. However, the application of epoxies in demanding tribological applications is often limited by the properties of the pristine epoxy matrix such as low load bearing capacity under severe p-v regimes combined with low thermal conductivity values. In this study, the load bearing capacity of the pristine epoxy coating system applied onto non-textured, plasma treated mild steel substrates was first evaluated under dry sliding conditions. Wear tests were conducted using a ball on disk configuration with a grade 440C hardened stainless steel ball with a diameter of 6.3 mm and a hardness of 62 HRC, as the counterface. Graphene oxide (GO) fillers in varying concentrations of (0.25, 0.5, 1 and 1.5 wt%) were added to the pristine epoxy matrix to produce Epoxy-GO nanocomposite epoxy coatings and tribological evaluation was carried out. Tribological tests revealed that the addition of GO nanoparticles at 0.5 wt% filler loading led to a significant improvement in wear life (~6.5 times) when compared to the pristine epoxy system. In the second phase of this study, titania (TiO2) fillers were added to the optimized epoxy-0.5 wt% GO nanocomposite coating to produce GO-TiO2 hybrid nanocomposite epoxy coatings and tribological evaluation was carried out. However, tribological tests did not indicate any significant increase in the wear life after the addition of TiO2 as compared to the Epoxy-GO nanocomposite epoxy coatings. A detailed study of coating failure and wear mechanisms at significant datapoints were carried out using a combination of techniques namely coefficient of friction graphs for wear life, SEM for wear track imaging, EDS for elemental analysis of the wear track to establish failure, optical profilometry and counterface imaging using optical microscopy.

Synthesis and Characterization of Anti-Scratch and Anti-Corrosion Hybrid Nanocomposite Coatings Based on Sol-Gel Process

Hybrid nanocomposite coatings containing SiO2, TiO2, ZnO, and ZrO2 particles were synthesized based on sol-gel precursors, including tetraethoxysilane (TEOS), 3glycidoxypropyl trimethoxysilane (GPTMS), tetra(n-butylorthotitanate) (TBT), zinc acetate dihydrate, and zirconium chloride (IV). The nanocomposites were characterized using FTIR, SEM, DLS, and EDAX methods. Results indicated that the size of the inorganic particles was in the range of nanometer (283.3, 163.5, 99.2, and 2.5 nm for ZrO2, SiO2, ZnO, and TiO2, respectively) with a very uniform distribution and dispersion. Hybrid nanocomposite coatings containing different amounts of nanozirconia were prepared on a 30-μm thick steel sheet for the subsequent scratch test. The highest scratch resistance of 3950 g was associated with the coating containing 0.0015 g nanozirconia. The electrochemical properties of the composite coating were investigated using potentiodynamic polarization (TOEFL) and electrochemical impedance spectroscopy (EIS). The results showed that the corrosion resistance of the steel sheet coated with zirconia composite is much better than that without the coating. The ZrO2 composite coating also showed better corrosion inhibition and improving surface resistance against mechanically induced scratches, without any trade-off in transparency.

Organic-inorganic hybrid coatings containing phosphorus precursors prepared by sol–gel on Ti6Al4V alloy: Electrochemical and in-vitro biocompatibility evaluation

The durability and long-term success of metallic implants are enhanced through the molecular scale design of biocompatible and corrosion resistant surface coatings. To pursue this hypothesis, we have developed a new class of organic-inorganic (O-I) hybrid nanocomposite coatings based on tetramethylorthosilicate (TMOS) and γ-methacryloxypropyltrimethoxysilane (MAPTMS) as organofunctional alkoxysilanes precursors and dimethyltrimethylsilylphosphite (DMTMSP) as a phosphorus precursor. Addition of DMTMSP to TMOS-MAPTMS hybrids increased the extent of intermolecular condensation and cross-linking observed. Both normal human osteoblast in-vitro biocompatibility and corrosion resistance were enhanced in coatings containing DMTMSP. Though increasing phosphorous content correlated with biocompatibility, a compromise in the amount of phosphorus incorporated would be required if corrosion resistance was the most desirable parameter for optimization, at least for single coat systems. Evaluation of the electrochemical behaviour and the in-vitro biocompatibility show that films prepared using these materials by dip coating onto Ti6Al4V alloys offer a promising alternative to simpler coatings and wholly metallic prostheses.

In-situ synthesis of synergistically active ceria doped polypyrrole oleo-polyesteramide hybrid nanocomposite coatings: Corrosion protection and flame retardancy behaviour

To overcome the shortcomings of petro-based polymer coatings, researchers have intensified research efforts on the development of eco-friendly and sustainable polymer coatings. It may help in reducing the burden on fossil fuel, which is expected to deplete by near future. Thus, here we report the In-situ formulation of solvent-less hydrophobic bi-functional ceria doped Tung Oil Polyesteramide nanocomposite coatings. The physico-chemical, physico-mechanical, structural, corrosion protective and flame-retardancy performance of these hybrid inorganic-organic nanofillers dispersed Tung Oil polyesteramide nanocomposite coatings were investigated using standard methods i.e. Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), x-ray diffraction (XRD), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vertical burning test (VBT), potentiodynamic polarisation (PDP), electrochemical impedance spectroscopy (EIS) and salt-spray test. The studies revealed that the prepared nanocomposite coatings exhibit excellent adhesion, hydrophobicity, negligible water uptake, superior corrosion protection and flame retardancy behaviour than those of other such reported oleo polymer coating systems. The coatings can be safely used up to 200 °C.

Preparation of hybrid nanocomposite coatings via sol-gel method for hydrophobic and self-cleaning properties

Hybrid organic-inorganic, hydrophobic and photocatalytic nanocomposite coatings that include Ce doped TiO2 nanoparticles (c-TiO2 NPs) were developed with the sol-gel process. The inclusion of c-TiO2 NPs in hydrophobic coatings was also proven to be able to exhibit self-cleaning performance. Tetraethyl orthosilicate and 3-glycidyloxypropyl)trimethoxysilane were used for hybrid polymer network. The 1H, 1H, 2H, 2H-perfluorooctyl triethoxysilane precursor was used to develop hydrophobic behaviors. The c-TiO2 NPs prepared with the sol-gel method were added to the obtained hybrid polymer network at rates of 10%, 20%, 40%, and 60%, and the coating solutions were deposited to the glass substrates by spray method. The obtained nanocomposite coatings were cured at 160 °C. The self-cleaning properties, wetting behaviors, optical characterization, morphological and mechanical properties of the acquired coating surfaces were examined. The adhesions of the obtained films were classified as 5 B, and the pencil and newton hardness were 9H and 2.4 N, respectively. This study acquired photocatalytic hybrid nanocomposite films that are highly transparent and do not have color changes noticeable with the naked eye and that also exhibit oleophobic properties. Thanks to low-curing temperatures, there was no need for any barrier coating between the applied film and the glass for ion diffusion to obtained films.

Tribological and Electrochemical Characterization of UHMWPE Hybrid Nanocomposite Coating for Biomedical Applications.

A new approach of using a polymer hybrid nanocomposite coating to modify the surface of titanium and its alloys is explored in this study. Electrostatic spray coating process is used to deposit the coating on the plasma-treated substrates for better adhesion. Ultra-high molecular weight polyethylene (UHMWPE) has been selected as the parent matrix for the coating due to its biocompatibility and excellent tribological properties. However, to improve its load-bearing capacity carbon nanotubes (CNT’s) (0.5, 1.5, and 3 wt.%) are used as reinforcement and to further enhance its performance, different weight percent of hydroxyapatite (HA) (0.5, 1.5, 3, and 5 wt.%) are introduced to form a hybrid nanocomposite coating. The dispersion of CNT’s and HA was evaluated by Raman spectroscopy and scanning electron microscopy. The electrochemical corrosion behavior of the nanocomposite coatings was evaluated by performing potentiodynamic polarization and electrochemical impedance spectroscopic tests in simulated body fluid. Tribological performance of the developed hybrid nanocomposite coating was evaluated using a 6.3 mm diameter stainless steel (440C) ball as the counterface in a ball-on-disk configuration. Tests were carried out at different normal loads (7 N, 9 N, 12 N, and 15 N) and a constant sliding velocity of 0.1 m/s. The developed hybrid nanocomposite coating showed excellent mechanical properties in terms of high hardness, improved scratch resistance, and excellent wear and corrosion resistance compared to the pristine UHMWPE coatings.

Hydrophobic, organic–inorganic hybrid sol–gel coatings containing boehmite nanoparticles for metal corrosion protection

In this study, fluoro-functionalized hydrophobic/oleophobic hybrid nanocomposite coatings, which are highly resistant and transparent, long-lasting and mechanically stable, have been deposited on metal substrate surfaces by the sol–gel method. Organic–inorganic hybrid matrix was prepared using tetraethoxysilane and organically modified silicon alkoxide, namely 3-(glycidyloxypropyl) trimethoxysilane. Additionally, to increase hydrophobic behavior, a fluorinated silica-alkoxide precursor and AlO(OH) NPs were added to the hybrid matrix. Water and n-hexadecane contact angle, surface morphologies, thicknesses and surface roughness of the films were determined. Additionally, optical characterizations and mechanical properties of the films such as light transmittance, haze, clarity, gloss were investigated. A salt spray corrosion test and electrochemical corrosion measurements were also performed. Optimum properties were acquired in the hydrophobic hybrid nanocomposite coating containing 15 wt% of 3 nm AlO(OH) NPs.

Synthesis, Characterization, and Investigation of Inhibitor Release of the Anticorrosion Sol–Gel Hybrid Nanocomposite Coatings

Corrosion protective coatings were developed on 1050 aluminum alloy through the sol–gel process using 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetramethoxysilane (TMOS), and diethylenetriamine (DETA) as the cross-linking agent. Two organic corrosion inhibitors (2-mercaptobenzothiazole and 2-mercaptobenzimidazole) were applied to induce inhibition properties. Salt spray method was employed to evaluate the corrosion protection performance. It was found that organic inhibitors improved the corrosion resistance of the coatings. Formation of silica networks from two precursors of GPTMS and TMOS in the presence of DETA curing agent was confirmed by FTIR. Distribution of silicon and sulfur, surface morphology and the presence of nanoparticles in the matrix were studied by SEM, EDX and TEM techniques. Physical and thermal properties of the coatings were investigated by water contact angle, Pull Off and DMTA tests, respectively. The results revealed that the presence of the organic inhibitors decreased the hydrophilicity and increased adhesion strength but has no significant effect on thermal properties. The controlled release of MBI was also investigated by UV-Vis spectrophotometry.