Impedance Modulus Research Articles

Construction of smart halloysite nanocontainers for active long-term anticorrosion of epoxy coatings

With the increasing severity of metal corrosion damage, preparing coatings with long-term anticorrosion properties is attracting more attention. Herein, halloysite nanotubes (HNT) encapsulated by chitosan (CS) with pH-responsive release of corrosion inhibitors (BTA) are prepared, which is denoted as HNT-CS@BTA and employed to promote the long-term anticorrosion properties of epoxy coating. The BTA release curve illustrates that the BTA can be released in an acidic environment. From the electrochemical results, the low-frequency impedance modulus of the coating with 1 wt% HNT-CS@BTA still reaches 1.47 × 109 Ω·cm2 after 42 days, exhibiting a significantly higher value than the pure epoxy coating of 9.26 × 105 Ω·cm2. The uniaxial tensile test shows that the coating added 1 wt% HNT-CS@BTA results in a significantly enhanced tensile strength of 3.90 MPa, surpassing that of the pure epoxy coating by more than twofold. The results of the scanning Kelvin probe show that the coating with 1 wt% HNT-CS@BTA has a higher potential at the scratched area, proving the self-healing properties. The results demonstrate that halloysite nanotubes can serve as nanocontainers to endow the coating with self-healing properties and promote the mechanical and long-term anticorrosion properties of epoxy coatings.

Enhancement of anticorrosion resistance of a fluorinated polyimide matrix by incorporating self-fixing POSS-GO

In this study, we aimed to enhance the anticorrosion performance of composite coatings by introducing polyhedral oligomeric silsesquioxane (POSS)-grafted graphene oxide surfaces. These surfaces were modified to achieve super-hydrophobicity and a self-fixing effect. The modified material was employed to enhance the corrosion resistance of fluorinated polyimide (FPI) composite coatings composed of graphene oxide (GO) grafted by POSS (POSS-GO). The resulting composite coating exhibited substantially improved corrosion resistance compared to a pure FPI coating. The impedance modulus (|Z|0.01 Hz) of the 0.3 wt% FPI/POSS-GO coating was approximately 2.57 × 1011 Ω·cm2, which was greater than that of the pure FPI coating by approximately five orders of magnitude. The enhanced performance can be attributed to the synergistic interaction between the intrinsically hydrophobic polyimide matrix polymer, which acts as a barrier, and the POSS-GO fillers with their superhydrophobic and self-fixing characteristics. Notably, these properties remained effective even after subjecting the coatings to a 3.5 wt% NaCl solution during a 45-day salt spray test. These findings have significant implications for the development of cost-effective anticorrosion coatings for metal substrates.

Superhydrophobic and corrosion-resistant of 2-methylimidazolezincsalt-based coating enhanced with silane modification

Developing eco-friendly coatings is crucial for protecting the surface of carbon steel, and particularly important is the development of chemically stable, durable, and highly stable superhydrophobic coatings which have become a growing trend. In this study, a hydrophobic nano-composite coating was synthesized, which consists of 2-methylimidazolezincsalt (ZIF-8) particles stabilized in cross-linked TEOS and coated with micro/nano-sized silica. Electrochemical experiments and surface analysis were conducted to evaluate the electrochemical behavior and interaction mechanism between ZIF-8 @SiO2/APTES/EP and Fe. The results showed that ZIF-8 @SiO2/APTES/EP has excellent inhibition performance in 3.5 wt% NaCl solution with inhibition efficiency up to 99.99%. Even after soaking for 72 h, the impedance modulus remains at 6 orders of magnitude, demonstrating excellent anti-corrosion performance. SEM and contact angle analysis demonstrated that a dense ZIF-8 @SiO2/APTES/EP film was formed on the mild steel surface, which has good corrosion resistance and chemical stability. This study is of great significance for guiding the design of high-performance hydrophobic coatings and meets the requirements of various industries for corrosion protection of mild steel surfaces.

Graphene-like 2D Ti3C2Tx MXene/dodecyltrimethoxysilane coating for corrosion protection on aluminum alloy by designing multilayer structure

Corrosion of metals leads to great economic losses and safety hazards. To address the corrosion problem of Al alloy in aggressive medium, two-dimensional (2D) graphene-like MXene composite coatings are proposed to enhance the corrosion resistance. Despite great progress, it still faces challenge to design high-performance MXene-based composite coating via a facile strategy because of the complex surface functionalization, orientation control, and the conductivity of MXene. Herein, a multilayer Ti3C2Tx MXene/dodecyltrimethoxysilane (MXene/DTMS) coating is prepared by a layer-by-layer spraying method at ambient temperature to maximize the physical barrier of MXene nanosheets. As a result, the incorporation of MXene nanosheets can avoid the structural defects of silane coating after curing process, thereby improving the coating resistance and charge transfer resistance by ~11- and ~390-fold in comparison to Al counterpart, respectively. Beyond the traditionally complex surface functionalization and orientation control, the multilayer coating with complete coverage and strong physical barrier ability exhibits the high corrosion resistance with a impedance modulus of 3.74 × 107 Ω·cm2 in 3.5 wt% NaCl solution. The designed coating shows promising applications in surface protection on Al alloy used in transmission cable, shafts, gears, and blades for offshore wind turbines.

Superior tribological and anti-corrosion performance of corrosion inhibitors intercalated LDH-MAO coating on AZ31 Mg alloys

Sodium dodecyl sulfate (SDS) and 8-Hydroxyquinoline (8-HQ) intercalated layered double hydroxides (LDH) sheets were in-situ formed in MAO layer to prepare a composite coating (CI@LDH-MAO) on AZ31 magnesium alloy. This composite coating demonstrates commendable anti-corrosion performance, primarily attributed to the formation of LDH sheets and insoluble Mg(HQ)2 compounds. The electrochemical impedance modulus of the composite coating surpasses that of the MAO coating by three orders of magnitude after immersion of 360 h. Concurrently, the CI@LDH-MAO composite coating exhibits exemplary tribological properties, characterized by a friction coefficient of approximately 0.19 and a wear rate of (11.5 ± 1.5)× 10−6 mm3/(N·m). This outstanding tribological performance can be ascribed to enhanced interaction of lubricants with the friction interface by 8-HQ and SDS anions.

Effects of h-BN content and silane functionalization on thermal conductivity and corrosion resistance of h-BN/EPN coating

The effects of h-BN and silane functionalization on h-BN/EPN coating are investigated. Herein, kinds of 3-aminopropyltriethoxysilane (APTES, KH-550)-functionalized-h-BNNs (A-BNNS)/epoxy phenolic resin (EPN) coating are prepared. XRD results show that the silanization treatment does not affect the organization of A-BNNS. XPS and TEM results indicate that the number of silane molecules on the surface of A-BNNS increases with APTES addition. SEM results show that the A-BNNS filler is uniformly dispersed in the coating, but the porosity increases. TC, heating infrared thermal and EIS results all present a trend of increasing first and then decreasing, with the enhancement of silane functionalization. In a positive effect, the silanol molecules enhance the crosslink density of the coating, which improves the thermal conductivity and corrosion resistance of the coating. However, on the negative side, as the degree of silane increases, the silane film with low thermal conductivity on the surface of A-BNNS thickens. Meanwhile, the increase in filler content significantly shortens the transmission distance of phonons between fillers and improves phonon transmission efficiency, thus enhancing the thermal conductivity of the coating. Nevertheless, as the A-BNNS content increases, the total amount of defects between the filler and resin interface also increases, and the hydrophilicity of A-BNNS increases, which would lead to a rapid decrease in the corrosion resistance of the coating. As a result, when the initial ratio between h-BNNs and APTES is 1:3 and 15 wt% A-BNNS is added, the best comprehensive coating performance can be obtained, i.e., and the TC of the coating reaches 0.64 W/m·K while the impedance modulus at 0.05 Hz is 1.12 × 1010 Ω·cm2. This work provides an important guidance for the exploitation of heat exchanger coatings with excellent TC and corrosion resistance.

Pretreatment of Carbon Steel with Hybrid Film Modified with Different Natural Inhibitors (Garlic and Cocoa)

One way to protect carbon steel from corrosion is through pretreatment and corrosion inhibitors, such as the use of silane layers that can protect against corrosion. In this study, the corrosion resistance of the tetraethyl orthosilicate/3-glycidoxypropyltrimethoxysilane hybrid film modified with garlic peel powder or cocoa shell powder on carbon steel was evaluated. By electrochemical impedance spectroscopy (EIS) it was observed that the incorporation of inhibitors promoted higher values of impedance modulus compared to the bare metal substrate or in the absence of inhibitor, and the concentration of 1.77 g/L provided the best performance for both natural inhibitors. The Fourier transform infrared spectroscopy showed that the addition of inhibitors to the hybrid film promoted better hydrolysis in the formation of the films. By the scanning electron microscopy and energy dispersive spectroscopy it was noted that there was the formation of the hybrid film on the metal surface, and the insertion of the inhibitor to the silane film enabled the formation of grains that precipitate from the deposition of the inhibitor on the substrate surface. The scanning vibrating electrode technique shows that the inhibitors improved corrosion resistance of the hybrid film, corroborating with the EIS analysis. The contact angle shows that the presence of the inhibitor in the silane film makes it less hydrophilic. The roughness profile shows that the hybrid film with cocoa has the highest roughness represented by a higher average value of average roughness (Rz).

Structural, dielectric, impedance, and electric modulus characteristics of Y2CaCuO5 high-k dielectric ceramics

With the increasing trends of integrated circuit densification, device miniaturization, and exponential growth of microelectronic components there is a huge responsibility on the part of material researchers to derive, design, and develop new materials. Materials that can overcome the existing limitations in the present compounds available in the market or can expedite the process of material fabrication are of great interest. This feat can be achieved by the fabrication of new materials, and analysis of various characterizations viz. (structural, dielectric, transport behavior, and impedance spectroscopy). With this perspective, in this communication, a high permittivity dielectric material belonging to the Y-Ba-Cu-O ternary systems where barium is replaced by calcium (Y2CaCuO5) is synthesized using solid-state reaction route. X-ray diffraction, scanning electron micrograph, and energy-dispersive X-ray spectroscopic study confirm the phase and microstructure of the sample. The observed higher value of the dielectric constant is understood from Koop’s phenomenological theory and internal barrier layer capacitance model. The dispersive behavior of conductivity is interpreted by Jonscher’s power law. Overlapping large polaron tunneling model for conduction is observed. Impedance spectroscopy analysis reveals non-Debye type of relaxation with variable time constants. According to Nyquist plots; up to 250 °C only grain effect (bulk) is dominantly present; however, at higher temperatures, the contribution from both grain and grain boundary is seen.

The Influence of Titanium Dioxide Nanosheet on Water Permeability of Silicone Rubber after Nitrogen Dioxide Aging Treatment.

In this study, the aging process of a surface-functional titanium dioxide nanosheet (f-TNS) composited room-temperature-vulcanized silicone rubber (RTV) composite coating was simulated in a NO2 generation device, and then the electrochemical impedance spectroscopy (EIS) of the aged composite coating was tested in a 3.5% NaCl solution. The water permeation process was analyzed by the changes in the impedance modulus, porosity, and breakpoint frequency of the composite coating. The experimental results show that the water permeability of aged RTV decreases first and then increases with the increase in the composite proportion of f-TNS. When the composite proportion of TNS was 0.3 wt.%, the composite sample had the minimum water permeability and the best resistance to NO2 corrosion. The effect of TNS on the NO2 aging resistance of RTV composites and its mechanism were studied by SEM, FT-IR, and XPS. The impedance modulus and porosity of the aged 0.3% f-TNS/RTV, respectively, were 1.82 × 107 Ω cm2 and 0.91 × 10-4%, which increased by 2.23 times and decreased by 0.37 times, respectively, compared with the values of aged pure RTV sample. In addition, the breakpoint frequency of the aged 0.3% f-TNS/RTV also significantly reduced to 11.3 Hz, whereas it was 35 Hz in aged pure RTV.

Lubrication, wear resistance and corrosion protection on aluminum alloy toward multifunctional coatings with nano-CeO2 inhibition effect

The coupling effect of wear and corrosion aggravates the damage and failure of key moving parts of high-end equipment, leading to a significant reduction in their service life. In present work, a functional integrated composite coating with exceptional corrosion resistance and tribological properties was developed by utilizing the responsive corrosion inhibition of nano‑cerium oxide (nano-CeO2) and the low surface energy and low shear characteristics of polytetrafluoroethylene (PTFE). The tribological behaviors and corrosion protection performance of coatings on aluminum alloy 2024 were evaluated and the corrosion inhibition mechanism was further discussed. The results revealed that Ce3+ on the surface of nano-CeO2 reacts with OH− generated by the REDOX reaction of the cathode to produce a uniform and stable passivation film, which can effectively improve the corrosion resistance of the metal matrix. Notably, the most obvious passivation effect is presented when the 2 % addition of nano-CeO2 as the larger low-frequency impedance modulus of 4.49 × 1010 Ω·cm2 and higher phase angle of 88°. The introduction of PTFE not only changes the coating from hydrophilic to hydrophobic, but also further improves the shielding properties of the coating. The low-frequency impedance modulus of the coating further increases by an order of magnitude to 2.38 × 1011 Ω·cm2, and its neutral salt spray resistance exceeds 210 days. Besides, the friction coefficient is reduced by 77.43 % and the wear resistance improved by 6.8 times compared with phenolic epoxy coating. Due to the enhancement and corrosion inhibition effect of nano-CeO2, the lower friction coefficient (0.044) and good wear resistance are further presented under the corrosive medium condition of 3.5 % NaCl solution.

A polyurea coating containing GO/MA@PFAN filler provides long-term shielding and passive performance to resist corrosion for N80 steel

The functionalization of graphite oxide (GO) by myristic acid (MA) enables stronger binding of fluoro-substituted polyaniline (PFAN) on the GO surface, improving hydrophobicity and compatibility with polyurea resin of fillers, resulting in uniform dispersion in coating. Electrochemical impedance spectroscopy (EIS) revealed that the impedance modulus of GO/MA@PFAN (GMPF) coating was greater than 1010 Ω·cm2 (80 days, 3.5 wt.% NaCl solution). Simultaneously, the scratched GMPF coating retained extraordinarily high impedance (4.98 × 104 Ω·cm2, 72 h), which could be attributed to the outstanding passivation of PFAN. Furthermore, the |Z|0.01 Hz value of GMPF coating still reached 8.94 × 109 Ω·cm2 after being subjected to CO2-high temperature and high-pressure (HTHP) corrosion (90 °C, 2 MPa, 72 h, 3.5 wt.% NaCl solution). Herein, the proposed disposal can effectively improve the corrosion resistance of N80 steel under saline and CO2-HTHP corrosion environments and has broad application prospects in oil and gas well engineering.

Fabrication of Epoxy Composite Coatings with Micro-Nano Structure for Corrosion Resistance of Sintered NdFeB

A novel micro-/nano-structured coating for corrosion resistance of sintered NdFeB was constructed based on the synergetic effect between the “bridge” structure of nanoparticles and the “labyrinth effect” of micro-/nanoflakes. Iron-titanium nanopaste (ITNP) and micro-/nanoflake silver powder (MNFS) were added into epoxy resin to prepare an epoxy micro-/nano-composite coating material, and then the prepared composite coating material was coated on sintered NdFeB permanent magnets by air spraying, obtaining an epoxy composite coating with a micro-/nanostructure. The effect of the micro-/nanomaterials on the microstructure and corrosion resistance of the composite coatings was investigated, and the mechanisms of the enhancement in corrosion resistance were proposed. The results show that when immersed in 3.5 wt.% NaCl solution for 32 days, the ranking of the capacitive time constant radius and impedance modulus of the coatings at a lower frequency (Zf = 0.01 Hz) is pure EP < EP/ITNP < EP/MNFS < EP/ITNP/MNFS, respectively, and the salt spray test time of the EP/ITNP/MNFS coating is more than 720 h, which is more than twice that of the pure EP coating.

Surface modification and interface strengthening strategies for fly ash and its application in anti-corrosion coatings

A robust anti-corrosive coating has been prepared by using functional fly ash with excellent interface binding strength. Molecular cross-linking design and surface augmentation techniques improve the anti-corrosion capabilities of functional fly ash coatings. The epoxy group produced by functional fly ash cross-links with the iminoamino group of isocyanate, resulting in prominent shielding functions and mechanical property improvements. In comparison with pure polyurea coating, it can improve the impedance modulus by 1000 times. This study is expected to provide new insights into the preparation of functional fly ash coatings with a unique internal cross-linking effect.

Synergistic effect of 8-HQ@CeO2 for enhanced corrosion resistance of self-healing polyurethane coating for corrosion protection of mild steel

The anticorrosive qualities of organic coatings can be enhanced by the inclusion of corrosion inhibitors, which is helpful for ensuring the long-term anticorrosive performance of the coatings. Taking advantage of the fact that polydopamine contains multiple functional groups, the 8-HQ@CeO2 polyurethane composite coating was prepared by coating it on the surface of CeO2 and adsorbed with 8-Hydroxyquinoline (8-HQ), and its anticorrosion performance in 3.5 wt% NaCl solution was investigated. After 120 days of immersion, the polyurethane composite coating containing both CeO2 and 8-HQ organic/inorganic dual corrosion inhibitors exhibited excellent long-term corrosion resistance. Its impedance modulus at 0.01 Hz (108 Ω·cm2) was two orders of magnitude higher than that of the polyurethane composite coating containing only CeO2 (106 Ω·cm2). The coating also incorporated dynamic Diels-Alder (DA) bonds to create its self-healing characteristics. The produced composite coatings could exhibit effective self-healing behavior under sunlight thanks to the superior photothermal characteristics of polydopamine (PDA), and their mechanical and anticorrosive properties were substantially unaltered before and after self-healing. The strategy utilizes the synergistic anticorrosive effect of CeO2 and 8-HQ and dynamic DA bonding to achieve the long-term anticorrosive performance of the coating and proposes a new method to protect metal substrates.

Moisture Content Detection of Tomato Leaves Based on Electrical Impedance Spectroscopy

ABSTRACT The rapid detection of moisture content in tomato leaves can provide an important basis for tomato cultivation. Compared with spectroscopy technology, image technology, and dielectric detection technology, electrical impedance spectroscopy (EIS) has the potential to analyze the internal components of leaf microstructure qualitatively and quantitatively, and the characteristics of fast detection and low cost. The moisture content in tomato leaves was detected effectively and accurately at the anthesis of the first inflorescence using the EIS method. The influence of reduction of moisture content on the impedance characteristics and equivalent circuit parameters was analyzed. The frequencies of different impedance characteristics were selected based on the out-of-bag (OOB) importance. Different regression algorithms, including partial least square regression (PLSR), back-propagation neural network (BPNN), and random forest (RF), were used for estimating the leaf moisture content (LMC). The LMC models based on different impedance characteristics and different methods were established and compared. The results demonstrated that the impedance modulus in the low-frequency region, the extracellular resistance (R e), and the intracellular resistance (R i) increased first and then decreased with the decrease in the moisture content of the tomato leaves. The RF model established with the combination data had the best performance, with the coefficient of determination (R 2), normalized root-mean-square error (NRMSE), and the ratio of performance of deviation (RPD) for prediction being 0.8861, 6.02%, and 2.95, respectively. Therefore, the EIS method combined with RF was a feasible and effective method to predict LMC, providing a promising tool for moisture content detection.

Facile Preparation of Hierarchical Micro‐/Nanostructure Superhydrophobic Surface with Excellent Corrosion Resistance on Ti6Al4V‐Based Composite for Nuclear Fuel Reprocessing

To address the poor corrosion resistance of titanium matrix composites treatment vessels for nuclear fuel reprocessing in HF solution at room temperature and high concentration of HCl/HNO3 solutions at high temperature, hierarchical micro‐/nanostructure surfaces with adjustable superhydrophobicity are prepared on Ti6Al4V‐based composites by laser microengraving followed by fluorosilane modification. The effect of topography and composition of the surface on wettability is investigated. More importantly, the anticorrosion mechanism of the as‐prepared surface in the earlier corrosive solutions that can destroy the anticorrosion inert oxide film of the composite easily is investigated and elucidated for the first time. The results indicate that the surface is composed of regular parallel linear peak‐like microscale structures and radiating flocculent nanostructures. It shows excellent and stable superhydrophobicity (contact angle of 158.4°, sliding angle of 4.7°). Due to the unique solid–air–liquid interface induced by the micro‐/nanostructures and high charge transfer resistance induced by the fluorosilane film, the impedance modulus of the superhydrophobic surface can be one order of magnitude higher than that of the bare surface. The composite can be corroded hardly when immersed in 5% HCl/HNO3 solutions at 80 °C for more than 10 days and 4% HF solution at room temperature for 3 days.

Aptamer conjugated Si nanowire network/poly(pyrrole)-NTA structure for electrochemical sensing

The current study describes the design, analytical characterization, and testing of aptamer sensors based on Si nanonets (Si NN) for thrombin electrochemical detection. Si nanonets are thin sheet arrays of randomly aligned Si nanowires with controlled and programmable properties that may be transported and integrated on a variety of substrates. Si nanonets were placed onto a commercial glassy carbon working electrode to create our aptasensor. Then they were functionalized by conductive pyrrole polymerization, which was followed by aptamer bioreceptor grafting. Electrochemical detection of thrombin was carried out after optimizing the electrode properties. On the one hand, cyclic voltammetry analyses demonstrated a linear association between the acquired current and the logarithm of thrombin concentration from 5 nmol L−1 to 2 µmol L−1. Impedance measurements, on the other hand, revealed a linear relationship between the charge transfer resistance as well as the impedance modulus. Thus, for the first time, Si nanonet thin sheets were used as constitutive nanoporous parts of electrodes capable of detecting thrombin at concentration limits of 5 nM, considered as a risk factor or presence of thrombosis. This demonstrates the concept of using this type of nanomaterial to detect molecules of biological interest.

Comparative synergistic effect of hybrid composites based polyaniline wrapped metallic oxides (Ni, Fe and Mn) and its capacitive performance as electrodes for supercapacitor

Regarding the demand for new technologies for energy storage devices, supercapacitors can bridge the gap between conventional capacitors and batteries in terms of energy and power densities. It is reported that metal oxides (MOs), such as oxides of iron (Fe2O3), nickel (NiO), and manganese (MnO2, Mn2O3), among others, can act as a nucleus to obtain composites, interconnecting the polymer chains, with dimensions ranging from micrometer to nanometers, in addition to producing a porous morphology, which would be able to reach high specific surface areas. In this study, polyaniline (PANI) and its respective composites with iron oxides (Fe2O3) (PANI/Fe2O3), oxides nickel (NiO) (PANI/NiO) and manganese (MnO2, Mn2O3) (PANI/MnxOy) are developed, characterized, and compared. The field emission gun-scanning electron microscopy (FEG-SEM) images display that composites present porous morphology and dimensions ranging from micrometer, which can reach high specific surface areas. The Raman data exhibits that characteristic bands of polyaniline present in the composite materials underwent significant changes, which can be attributed to interactions of imine groups with metallic oxides. These interactions can be of the electrostatic, metal-organic, or hydrogen bonding type and directly influence the charge transfer and conductivity process, thus contributing to the increase in electrochemical performance. By electrochemical analyses, the nanocomposite materials synergism is proved, especially for PANI/MnxOy. By electrochemical impedance spectroscopy (EIS), capacitive profiles of synthesized materials are clear with a phase angle close to 90° in lower frequencies regions associated with smaller impedance modulus values in the whole analyzed frequency range. PANI/MnxOy composite also shows the highest capacitance value evaluated from a galvanostatic charge and discharge (GCD) of 115.78 F g−1. This is reinforced by its higher specific capacitance, energy, and power values of 205.55 F g−1, 21.9 W kg−1, and 1850 Wh kg−1, respectively, per CV.

Triple-function smart anticorrosion composite coating based on graphene and ZIF-8 with excellent pH-responsive self-healing and in vitro antimicrobial properties

Endowing composite coatings with robust anticorrosion properties for metal substrates in intricate corrosive environments, such as conferring self-healing and antibacterial capabilities through the integration of multifunctional nanofillers, constitutes a pivotal approach in the advancement of efficient anticorrosive coatings. In this study, a triple-functional anticorrosion coating entailed the simultaneous integration of graphene oxide (PG) with antibacterial capability, and BTA@ZIF-8/PM (PZ) with self-healing performance, into a waterborne epoxy (PGZ/WEP). The logarithm of the lowest frequency impedance modulus of PGZ/WEP demonstrated a notable value of 8.2 Ω cm2 following a 28 days immersion in simulated seawater, indicating an escalation of approximately 2.7 orders of magnitude compared to that the reference of WEP. For the antibacterial capabilities of coatings, an enhanced antibacterial rate (R) of up to 55.9 % was observed. Moreover, an in-depth analysis was undertaken to explain the underlying anticorrosion, self-healing, and antibacterial mechanisms of composite coatings. In conclusion, the PGZ/WEP composite coating manifests self-healing, antibacterial, and anticorrosive functionalities, thereby demonstrating exceptional adaptability to intricate corrosion-prone environments.

Ni-Co hydrotalcite modified diatom to achieve corrosion inhibition and Cl− adsorption for long-term corrosion protection of steel

Ni-Co Layered Double Hydroxide (LDH) shows great application potential in the field of anti-corrosion. However, the poor carrying capacity limits the performance of anticorrosion performance. In this study, Ni-Co hydrotalcite was grown on the surface of DE, and Ni-Co/DE@SP microcapsule with corrosion inhibitor loading up to 14.7% was successfully prepared. The adsorption capacity of Ni-Co/DE@SP for Cl− in 600 mmol/L NaCl solution was 6.72 mmol/g. It is worth noting that the impedance modulus of the prepared composite coating (EP/Ni-Co/DE@SP) is two orders of magnitude higher than that of the pure resin coating, and the wear resistance was improved by 33%.