Talc Particles Research Articles

Macroparticle-enhanced morphology engineering of Cordyceps sinensis for high glucose fermentation to optimize the production of bioactive exopolysaccharides

Cordyceps sinensis is widely known for its therapeutic properties. Enhancing the yield of exopolysaccharides (EPS), which is crucial for its medicinal efficacy, is a major challenge. In this study, we applied high initial glucose concentrations with talc particles to enhance EPS production and assessed the cell morphology, intracellular biochemical reactants, and bioactivity contribution of glycoproteins. The use of 150 g/L glucose and 10 g/L 2000 mesh talc increased the EPS yield by 1.8-fold to 4.21 g/L. The addition of talc regulated cell morphology, facilitated the entry of oxygen molecules into the cells to produce a large amount of ATP for polysaccharide synthesis, and altered the cell wall structure to facilitate the secretion of EPS. Moreover, environmental stress resulted in a notable increase in intracellular reactive oxygen species levels, which can potentially enhance cell membrane permeability and promote EPS synthesis. Furthermore, the highest protein content in crude EPS corresponded to the maximum activation of alcohol dehydrogenase (ADH) of 44.2 %, suggesting a mechanistic relationship between the proteins and polysaccharides in the glycoproteins that influence the activation of ADH. These findings elucidate the intricate interplay between fermentation conditions and EPS production and provide new avenues for optimizing the fermentation process of CS-HKI to enhance its therapeutic applications.

Uncovering the hetero-hydrophobic attraction between the basal planes of molybdenite and talc under flotation conditions

The very close natural floatability of molybdenite and talc has been traditionally believed as the main reason for their separation problem. However, the interactions between the basal and edge planes of the two platy minerals remain unclear. Here the hydrophobic attraction between the basal planes was proposed as the dominating factor for that problem. Flotation tests in both single and mixed mineral systems were conducted using carboxymethyl cellulose (CMC) as talc depressant and sodium isobutyl xanthate (SIBX) as molybdenite collector. Zeta potential distribution, contact angle, in situ optical microscope observation, EDLVO calculation and surface energy analysis were applied to reveal the surfacial actions between the basal and edge planes of molybdenite and talc. Molybdenite and talc showed obvious floatability difference in single mineral system, however, their separation efficiency met with big decline in mixed mineral system. Zeta potential results demonstrated that, in the presence of CMC and SIBX, negatively charged particles of molybdenite and talc aggregated rather than electrostatically repulsed and dispersed. The contact angle and particle adhesion results showed a certain degree of selective attraction between the basal planes of molybdenite and talc. The EDLVO calculation suggested the attractive interactions were ranked as: Mb(basal)-Tlc(edge) > Mb(basal)-Tlc(basal) ≈ Mb(edge)-Tlc(edge) > Mb(edge)-Tlc(basal). The surface energy calculation pointed out that the fundamental reason for the separation problem was exactly the hetero-hydrophobic attraction between their basal planes.

Joint use of sodium silicate and polysaccharides in the flotation of talcose copper-nickel ores

The paper considers the combined effect of polysaccharides (carboxymethyl cellulose and carboxymethyl starch) with sodium silicate in the f lotation of talcose copper-nickel ore. The analysis of the f lotation results and the assessment of hydrophobicity and surface charge of minerals showed that the composition of carboxymethylated polysaccharides and sodium silicate hydrophilizes the talc surface more effectively than each of the reagents separately. Moreover, sodium silicate alone hardly depresses the talc surface at all. The depression of f lotation-active silicates is effective when polysaccharide and sodium silicate are sequentially supplied. Under these conditions, sodium silicate makes a significant contribution to increasing the negative charge on the talc particles surface. The effect is more pronounced for compositions with starch, characterized by a lower degree of substitution compared to cellulose. It results in a significantly reduced recovery of f lotation-active magnesium-containing silicates and a slight decrease in sulfide recovery. To determine the features of the mechanism of talc and sulfide minerals depression in f lotation, we performed calculations using the extended DLVO theory based on the obtained values of the zeta potential and force of detachment. We established that sulfide minerals have no potential barrier preventing their interaction with an air bubble, regardless of the compositions of the studied depressants used. We propose the following interaction mechanism: when sodium silicate is supplied first, the talc basal surface is very insignificantly hydrophilized as SiO(OH)– ions are not easy to fix. On the contrary, when the carboxymethylated polysaccharide is supplied first, significant hydrophilization of the talc surface with carboxyl groups occurs due to the hydrophobic interaction between the corresponding regions of the macromolecule and the talc basal surface.

Plastic waste recycling in additive manufacturing: Recovery of polypropylene from WEEE for the production of 3D printing filaments

The inefficient management of wastes recovered from electric and electronic apparatuses (the so-called WEEE or e-waste) has become a severe global concern in the last years, since the indiscriminate accumulation of wastes containing hazardous material poses serious risks for the environmental, as well as for the human health. Despite the continuous development of innovative and efficient technologies for the mechanical recycling of WEEE plastics, the effective re-utilization of these fractions is often limited by their poor value-added. In this work, we propose a strategy for the valorization of a typical WEEE plastic stream recovered from small appliances (mainly composed on polypropylene filled with talc particles) through the formulation of filaments suitable for Fused Filament Fabrication (FFF) 3D printing processes. Preliminary spectroscopic analyses on the WEEE plastics allowed separating the sample in two streams, according to the different content of talc. Both streams were first characterized from a rheological point of view, aiming at assessing their 3D printability. Then, the mechanical properties and the morphology of the filaments (obtained after a close optimization of the extrusion conditions) were evaluated; the obtained results indicated the achievement of a regular geometry and mechanical properties comparable to those of commercial filaments. Finally, 3D printed specimens showed a satisfactory quality in terms of resolution and definition, demonstrating the possibility of profitably enhancing the value-added of WEEE plastics, using them as feedstock to produce sustainable 3D printing filaments.

INFLUENCE OF FILLERS ON THE STRUCTURE AND PROPERTIES OF POLYMER MATRIX

Purpose. Enhancement of the mechanical properties of the polymer matrix through the incorporation of finely dispersed fillers, namely aluminum oxide and talc, as potential modifiers.
 Research methods. Research was conducted on polymer specimens subjected to tensile testing according to DSTU EN ISO 527-5:2018. The tests were performed using a URM-5 tensile testing machine with a maximum force of 50 kN. Metallographic analysis was carried out using a KEYENCE VHX microscope at magnifications of 50 and 500. The microstructure of the polymer matrix was assessed through etching-free procedures.
 Results. The study demonstrates that the incorporation of finely dispersed aluminum oxide particles increased the strength parameter from 4.69 MPa to 13.07 MPa, as compared to the unfilled sample. Additionally, it was observed that the introduction of finely dispersed talc particles at a concentration of 0.75 % by mass led to an enhancement in strength values from 4.69 MPa to 12.74 MPa, in comparison to the unfilled sample.
 Scientific novelty. A polymer matrix with enhanced mechanical properties was achieved through the addition of fillers acting as modifiers. The optimal concentration of aluminum oxide and talc additives was determined. By comparing the results with previous studies involving aluminum oxide and talc at various concentrations in different types of polymer matrices, it can be concluded that the investigated concentrations of modifiers with epoxy resin ED-20 led to the production of a polymer composite with superior mechanical characteristics. The obtained results underscore the significant potential of aluminum oxide and talc as effective modifiers for improving the strength and other crucial properties of composite materials.
 Practical value. The obtained results highlight the significant potential of utilizing aluminum oxide and talc as modifiers for polymer matrices to enhance their mechanical characteristics. From a practical standpoint, the use of these fillers can exert a substantial impact on the development of new composite materials with improved properties, finding application in composite reinforcement production. Considering the heightened strength and resilience of the resulting materials, these composites can be effectively employed to create lighter and stronger structures in construction and other industries. Additionally, their application may lead to reduced repair and maintenance costs due to increased durability and resistance to mechanical loads. Thus, the implementation of the obtained results could have a substantial influence on the practice of composite material manufacturing, ensuring the creation of products with enhanced characteristics for various applications.

Modification of Talc and Mechanical Properties of Polypropylene-Modified Talc Composite Drawn Fibers

A large amount of the polypropylene (PP) produced worldwide is used in the form of fibers. In this work, a new modification route for talc and PP is investigated, which is based on the in situ polymerization of a silane–siloxane monomer mixture on the surface of talc particles or PP pellets, respectively. The obtained modified talc and PP samples were used for the development of PP-talc composite drawn fibers. Tensile tests, thermogravimetry (TGA), and X-ray diffraction (XRD) were used for the characterization of the materials. It was observed that such a modification procedure resulted in the exfoliation of some talc particles. Enhanced tensile strength was observed for composite drawn fibers of a low talc content (1% with respect to PP) and a low modifier content (2% with respect to talc), while co-aggregation of talc and silicone may occur at high silicone and talc contents, resulting in the inferior mechanical performance of the corresponding composites. It was concluded that the produced silicone polymer simultaneously acts as a modifier, antioxidant, and compatibilizer. The proposed modification route is promising and should be further optimized.

Using anisotropy rationally to fabricate porous cordierite ceramic with enhanced mechanical properties based on supportless stereolithography

Through tailoring the printing strategy, the oriented microstructure including the layered cordierite skeletons and oriented pores of porous cordierite ceramic became controllable and the mechanical orientation enhancement was achieved via supportless stereolithography (SLA) combining with reactive template grain growth (RTGG). The results showed that the oriented microstructure was related to the oriented talc particles caused by the shear stress of the scraper. When the loading direction was perpendicular to the XY plane, porous cordierite ceramic possessed higher flexural strength owing to the deflection of crack caused by the oriented pores, while the loading direction was parallel to the XY plane, it possessed higher compressive strength, derived from the interconnected layered cordierite skeletons preventing the Euler buckling. Based on the orientation dominance models, with decreasing the layer thickness, the apparent porosity was similar while the flexural and compressive strengths both increased. When the layer thickness was 25 μm, the flexural and compressive strengths of porous cordierite ceramics both reached the highest value, respectively.

Influence of talc particle size on the optical transparency, flame retardancy, and smoke release suppression of waterborne transparent fireproof coatings applied on wood surface

AbstractTalc with particle sizes of 1250 mesh (Talc‐1250), 3000 mesh (Talc‐3000), and 5000 mesh (Talc‐5000), used as synergist, was added into transparent fireproof coatings applied in wood substrates, and the influence of talc particle size on the comprehensive properties of the coatings was analyzed carefully. The results show that adding talc exerts super synergistic effect on enhancing the flame retardancy and smoke release suppression properties in the resulting coatings, and the synergistic efficiency of talc is varied with the talc particle size. Fire resistance analysis shows that the MTPPE2 coating containing Talc‐3000 exhibits better synergistic effects, accompanying a minimum back temperature of 106.3°C at 900°C and a maximum intumescent factor of 116.3. SEM‐EDS and FTIR analyses show that adding Talc‐3000 in the MTPPE2 coating contributes to the formation of a more intumescent and compact char against fire concomitant with the highest P/C mass ratio of 0.36 in char. Transparency analysis shows that the transparency of the coatings gradually decreases with the decrease of talc particle size, and the Talc‐1250 with exfoliated morphology imparts less loss of transparency to the coating while the Talc‐3000 and Talc‐5000 with intercalated morphologies induce more obvious light scattering in the coatings.Highlights Talc was used to enhance the comprehensive properties of transparent fireproof coatings. Synergistic efficiency of talc on the fire safety of coatings varies with its particle size. Talc with a particle size of 3000 mesh exerts an optimum synergism in the coatings. Transparency of the coatings gradually decreases as talc particle size decreases.

Fabrication of textured cordierite ceramics with low thermal expansion coefficient and custom structure via vat photopolymerization

Owing to the orientation of grains, textured ceramics possess particular properties along a specific direction. In this study, combining reactive template grain growth (RTGG) and vat photopolymerization, the textured cordierite ceramics with low thermal expansion coefficient (CTE) and custom structure were prepared successfully. Initially, the generation mechanism of the oriented c axis of α-cordierite grains in the XY plane was revealed by analyzing the evolution of microstructure during the sintering process. Then, two printing models were used to investigate the anisotropic CTE of porous cordierite ceramics fabricated by vat photopolymerization, indicating the effect of oriented grains and microstructure on the CTE. Finally, based on the selected dominant model, the controllable oriented microstructure was achieved by altering the shear stress provided by the scraper. The results showed that the oriented α-cordierite grains and skeletons were originated from the oriented tabular talc particles. Owing to the c axis of α-cordierite grains oriented in the XY plane, the CTE of the test direction parallel to the XY plane is lower than that perpendicular to the XY plane. In addition, with decreasing the setting layer thickness to adjust shear force, the oriented degree of tabular talc particles and α-cordierite skeletons became controllable. When the layer thickness reached a minimum of 25 μm, the CTE of porous cordierite ceramic reached the lowest of 1.26 × 10−6 K−1.

Quasi‐synchronous solid‐state reaction for cordierite powder synthesis

AbstractThis study investigates a quasi‐synchronous solid‐state reaction for synthesizing cordierite powder using talc, kaolinite, and Al2O3 mineral powders as starting materials. The thermal reaction proceeded with two different stages according to the Al sources provided by: (1) Al2O3 powders—the first stage starting at temperatures that were considerably lower than 1150°C and (2) kaolinite (mullite)—the second stage starting at temperatures that were higher than 1150°C. The goal is to shift the temperature of the first stage to coincide with that of the second stage by mixing α‐cordierite powder with the starting constituents. Exceeding the authentic reduction amounts of Al2O3 on talc particles leads to a rise in the temperature required to initiate the first‐stage reaction to 1200°C. However, this also eliminates the presence of β‐cordierite and spinel that occur in the first stage and allows for the early fulfilment of α‐cordierite formation in the second stage. The excess SiO2 released by the second stage compensates for the insufficient SiO2 required by the first stage, allowing for a smooth processing reaction. Also, a quasi‐synchronous solid‐state reaction for synthesizing cordierite occurs.

Biodegradable blown film composite from poly (butylene adipate-co-terephthalate) and talc: Effect of uniaxial stretching on mechanical and barrier properties

This research focuses on improving the oxygen and water vapour barrier properties of blown PBAT films after adding talc particles (15 and 25 wt%) followed by uniaxial stretching in the machine direction. DSC analysis revealed that the addition of talc enhanced %crystallinity by ∼42 and ∼125% at stretch ratios 5.5 and 6.0, respectively, compared to unstretched neat PBAT films, due to the dispersion and platelets morphology of talc particles, followed by uniaxial orientation of polymer chains. This significantly impacted the mechanical properties of PBAT as elastic modulus gained by ∼1939 and ∼2486% for the stretched composite films containing 15 and 25 wt% talc, respectively, over unstretched neat PBAT. The water vapour barrier of the stretched composite films was improved by ∼61 and ∼62% after adding 15 and 25 wt% talc particles, respectively, compared to PBAT due to its increased %crystallinity and can be a sustainable alternative to single-use plastics in flexible packaging.

Sustainable coatings based on core–shell pigments to enhance antibacterial and other beneficial paper properties

Paper manufacturers are constantly looking for new methods to improve coated paper properties. Pigments are encountered in paper coatings to add new functions. For example, titanium dioxide (TiO2 ) and talc are considered among the best-known pigments used in paper coating and manufacturing due to their whiteness and other beneficial properties. Nevertheless, talc has a weak dispersion during which its particles agglomerate, and this disadvantage needs to be overcome before its application which means higher cost. Therefore, in this work, a core–shell technique is used to modify the talc surface and enhance its dispersion in order to promote its use in improving the properties of the paper. Core–shell pigments are composed of a thin shell of (nano- and micronized) titanium dioxide precipitated on talc particles. These prepared talc/TiO2 core–shell pigments were characterized using various techniques such as XRF, SEM, and TEM, and then they were incorporated in paper coatings to evaluate their effect on the different properties of the coated papers. The results showed that nano-talc/TiO2 with the obtained unique chemical and morphological structure has improved the physical, mechanical, and optical properties of the coated papers besides improving their antimicrobial activity, especially when compared to papers coated with micronized talc/TiO2.

Detection of fine asbestos fibers using fluorescently labeled asbestos-binding proteins in talc

Asbestos contamination in common materials, including powdered talc used in manufacturing cosmetics, pharmaceuticals, and baby powder, is of great public concern. The use of polarized light microscopy (PLM) for asbestos detection is limited because it cannot detect fibers with diameters in the nano range. Furthermore, the use of electron microscopy (EM), the preferred method for determining asbestos contamination in talc, is hindered by a rather complicated and laborious process. Fluorescence microscopy (FM) is a simple analytical tool in modern life sciences, especially given its superior sensitivity and selectivity; however, it is rarely used for inorganic materials. Previously, we demonstrated that airborne asbestos fibers were fluorescently visualized under FM using fluorescently labeled asbestos-binding proteins. Here, we evaluated the FM method's feasibility in detecting fine asbestos fibers in powdered talc. The limit of detection of the fiber diameter of asbestos was approximately 0.06 µm using FM. The FM method's sensitivity surpassed that of PLM and approached that of EM, and thus, it can detect nano-scale fibers. Notably, the FM method enabled the selective visualization of asbestos fibers, including those hidden beneath numerous talc particles. A point counting method using FM images enabled a semi-quantitative analysis of 0.01–1.0% (w/w) asbestos contamination in talc.

Depression mechanism of ZnSO4 and Na2CO3 on talc flotation

The depression mechanism of a combination of ZnSO4 and Na2CO3 on talc during chalcopyrite and molybdenite flotation was investigated in-depth using flotation tests, solution speciation calculations, and various characterization techniques. Flotation tests indicate that the effective depression of talc flotation occurred in the pH range of 7−9. In this pH range, speciation calculations for the mixed solution of ZnSO4 and Na2CO3 showed that the Zn5(OH)6(CO3)2 precipitate was the predominant zinc-bearing species, which was further proven by X-ray diffraction and infrared spectroscopy measurements. Zeta potential measurement highlighted that the Zn5(OH)6(CO3)2 precipitate was positively charged while the talc surface was negatively charged in the pH range where talc depression occurred. X-ray photoelectron spectroscopy and field emission scanning electron microscopy confirmed the presence of the zinc-bearing precipitate on the surface of the talc particles treated by the combination of ZnSO4 and Na2CO3. These findings suggested that heterocoagulation between the formed Zn5(OH)6(CO3)2 and talc occurred mainly due to the electrostatic attraction, thereby leading to the depression of talc flotation.

Studying the impact of synthetic silica and cross-linked polymethyl methacrylate as anti-blocking agents on the physical properties of electric cables

One of the major problems associated with the production process of cables is the tight adhesion between the insulation and jacket (blocking), which is resulted from electrostatic and Van der Waals interactions between the two polymer layers. It makes them difficult to separate without damaging the insulation. As a conventional approach, a talc layer is applied within the insulation and jacket interface to prevent the blocking between the jacket and insulation. However, maintaining a uniform talc layer is difficult, and the uneven distribution of talc particles produces a non-smooth surface. Therefore, the conventional talc layer method has limited efficiency in reducing the bocking. In this study, a surface modification was done for both the insulation and jacket using synthetic silica and crosslinked polymethyl methacrylate (PMMA). This study evaluated the effect of these two additives on other physical properties, including heat stability, insulation resistance, tensile strength, elongation at break, and pressure stability. This study reveals that the application of synthetic silica has successfully reduced the blocking between insulation and jacket and favorably contributed to increasing insulation resistance. The optimum levels of anti-blocking agents to be used in the insulation and jacket compound have also been estimated by this investigation.

Water-based lubricant containing protic ionic liquids and talc lubricant particles: Wear and corrosion analysis

Water-based lubricants have been used in different industrial applications in recent years. However, studies evaluating the tribological and electrochemical effects of lubricants with Protic Ionic Liquid (PIL) and talc particles (TC) as additives on SAE 1010 and SAE 1045 steels are still scarce in the literature, which is the objective of this work. Samples extracted from steel sheets were investigated in the normalized (SAE 1010) and quenched-tempered (SAE 1045) conditions. Wear tests in a ball-on-plate type tribometer and corrosion tests using potentiondynamic polarization curves were performed in the presence of different lubricant solutions (PIL 3% + DI water, commercial lubricant 3% + DI water, with and without talc particle additions 0.05 and 0.1 wt%). Analyses of viscosity, pH, wettability, and particle size distribution were conduted on the lubricant and talc samples. Wear and corrosion surfaces were analyzed by SEM/EDS, and Raman techniques. The results showed that the tribofilm formed from the interaction between PIL lubricants and steel substrates decreased the wear due to the increase of lubricity of these lubricants. When the PIL and the commercial lubricants are compared, PIL additives presented higher performance, despite the talc addition. The influence of talc on the corrosion of steel is associated with the differential aeration effect, mitigated by adding the PIL.

Application of factorial model for an optimization of partial replacement of feldspar by talc on the sintering process

AbstractThis research used a factorial model containing two levels and three variables to evaluate the partial substitution of sodium feldspar (albite) by a talc ore found in abundance in the region of Itaiacoca—Brazil. The model can also be used to verify the influence of initial talc particle size, proportion, and sintering threshold temperature on the following physical properties, such as linear shrinkage, water absorption, bulk density, total porosity, and firing color. In this study, the mechanical strength of the compositions was evaluated by the flexural strength test. The factorial model indicated the sintering temperature as the variable that most affects the samples’ densification and the proportion of talc as the variable that changes the firing color. The experiment that used a higher sintering temperature combined with a coarser talc granulometry presented the highest mechanical strength. When more refined granulometry was used, there was the beginning of an overfire process. Water absorption values in the range of .04% and modulus of rupture of 49 MPa were obtained, confirming the talc's effectiveness as a secondary flux agent suitable for the formulation of ceramic bodies.

High strength insulating polymeric composite based on recycled/virgin polyethylene terephthalate (PET) reinforced with hydrous magnesium silicate (talc)

In the current work, post-consumer polyethylene terephthalate (PET) bottles were reclaimed and reinforced with hydrous magnesium silicate, Mg3Si4O10(OH)2 commonly known as talc and with virgin PET (VPET) for the development of high strength polymeric composites. The composite sheets were prepared using the thermomechanical melt processing method followed by a thermal press technique. VPET was mixed during melt processing of recycled PET (RPET) in a specific ratio to suppress thermal degradation and hydrolysis of developed composite. Various blends of the composite samples of VPET and RPET (RPETx - VPET1-x) with a fixed ratio of talc were prepared and investigated for their strength, conductivity and micro-properties. 45 μm talc particle in ratio 1 to 4 was used. The effect of the talc addition on mechanical properties of the composites at the sub-micron scale was investigated through nanoindentation with quasi-continuous stiffness mode (QCSM) to analyze the nano-mechanical properties as a function of contact displacement. Surface morphology and composition were studied through scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDX), which showed a uniform dispersion of talc particles with no agglomerates on the surface. Compressive strength was determined with the universal testing machine (UTM) that revealed the highest compressive strength of RPET80 – VPET20 blend with a lowest thermal conductivity gradient value of 0.0213 W.m−1 observed, thus making it preferable material for insulation purposes. Load-displacement curves displayed the harder behavior of the composite sheet containing RPET80 – VPET20/talc as it needed 100 μN load to impose a penetration depth of 7.5 μm only. The elastic modulus and hardness of RPET80–VPET20/talc composite was significantly improved as compared to other samples.

Uniting printability and self-supportability of cordierite precursor pastes for fabricating cordierite ceramics with custom structures via supportless stereolithography

Cordierite precursor pastes including talc, alumina and silica particles were successfully prepared to fabricate porous cordierite ceramics by supportless stereolithography (SLA). To combining the printability and self-supportability properties of the pastes, the effects of the type and content of the dispersant on the rheological behavior were systematically investigated. Additionally, the effects of solid loading and plasticizer type on the rheological behavior of the cordierite precursor pastes were studied. It was found that 1 wt% Span80 was optimal for modifying the rheological behavior of the cordierite precursor pastes. Furthermore, the results indicated that the printability deteriorated, and the hysteresis area and yield stress of the cordierite precursor pastes increased rapidly when the solid loading exceeded 33 vol%. With the addition of 18 vol% plasticizers to replace UV-curing resins, dibutyl phthalate (DBP) was more effective in improving the printability of cordierite precursor pastes and ensuring self-supportability, compared with the polyethylene glycol 400 (PEG400). Finally, using the optimized cordierite precursor pastes, the porous cordierite ceramics with custom structures were successfully prepared.

The influence of talc particles on corrosion protecting properties of polyurethane coating on carbon steel in 3.5 % NaCl solution

In this study, the main concern is investigating the effect of talc on the protecting properties of polyurethane (PU) coating based on acrylic polyol/hexamethylene diisocyanate. To this end, PU coatings containing different concentrations of talc (0, 5, 10 and 15 %), were prepared and applied to the steel surface. Anticorrosion behavior of the coatings was evaluated by electrochemical impedance spectroscopy (EIS) during 90 days of immersion in 3.5 % NaCl. The EIS data were used to simulate the anticorrosion behavior of the coatings by using equivalent circuit models (ECMs). The obtained results showed the highly positive effect of talc and the best protective performance was obtained at 10 % by weight of talc concentration. Moreover, different complementary tests, including the surface study by scanning electron microscopy (SEM) and atomic force microscopy (AFM), wettability by contact angle and the coating adhesion by pull-off test were employed to satisfy the EIS data and further study the protecting behavior of PU coating, modified with talc particles.