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Introduction:

Graphene Polyaniline nanocomposite is a composite material prepared by mixing Polyaniline and Graphene nano sheets.Due to the characteristics of Graphene such as high conductivity, high mechanical strength and good acid and alkali resistance of Polyaniline, Graphene Polyaniline nanocomposites have a broad application prospect in the field of anti-corrosion. However, how to accurately evaluate its anti-corrosion performance has become a research focus and difficulty.

The quality loss method is a commonly used method for evaluating the anti-corrosion performance of materials. The specific operation is to contact the Graphene Polyaniline nanocomposite to be evaluated with the corrosive medium for a period of time,Measure the quality change of the material. By comparing the quality differences before and after composite materials, their corrosion resistance can be preliminarily evaluated.

Overview of Plasma Surface Modification Technology

Plasma surface modification technology is a commonly used method that can improve the properties of plastic surfaces. Plasma is a highly excited gas,The molecular density of electrons, ions and Excited state is higher.The use of plasma to treat plastic surfaces can trigger a series of chemical and physical reactions, thereby altering the properties of plastic surfaces.

This technology has different application methods, including plasma spraying technology, plasma enhanced chemical vapor deposition technology, and plasma polymerization modification technology.

Plasma spraying technology is a method of spraying activated particles generated by plasma onto plastic surfaces through spraying equipment.Plasma spraying technology can modify plastic surfaces by controlling the spraying atmosphere and parameters. During the plasma spraying processActivation particles react with the plastic surface, resulting in changes in surface chemical composition, surface morphology, and surface energy.

Plasma enhanced chemical vapor deposition technology is a method of using plasma to activate reactive gases and form a layer of chemical substances on the surface of plastics through chemical reactions.

This technology can achieve precise control of plastic surfaces by adjusting parameters such as atmosphere, temperature, and deposition time. By using plasma enhanced chemical vapor deposition technology, thin films of different materials can be formed on the surface of plastics,Thus achieving changes in surface properties.

Plasma polymerization modification technology is a method of using plasma to activate monomer molecules and polymerize them on the surface of plastics to form a polymer layer.Through plasma polymerization modification technology, polymer layers with specific properties can be formed on the surface of plastics, such as hydrophilicity, wear resistance, chemical corrosion resistance, etc.This technology can achieve customized improvement of plastic surface properties by selecting different monomers and reaction conditions.

The main principle of plasma surface modification technology is to use plasma activated substances to interact with plastic surfaces, triggering a series of chemical and physical reactions, thereby changing the properties of plastic surfaces. These changes can include changes in surface chemical composition, enhancement of surface energy, and regulation of surface roughness. During plasma treatment, plasma activated particles react with the plastic surface,It causes the fracture and recombination of surface Chemical bond, or the removal and addition of surface adsorbents, thus changing the composition and properties of the surface.

The advantage of plasma surface modification technology lies in its high controllability and adjustability.By adjusting the parameters of plasma treatment, such as plasma energy, atmosphere composition, treatment time, etcIt can achieve precise regulation of plastic surface properties. In addition, plasma surface modification technology also has the advantages of efficiency, speed, and environmental friendliness=

Plasma surface modification technology has broad application prospects in plastic surface improvement.Through plasma spraying technology, a thin film with good coverage and adjustable particle size can be formed on the surface of plastic, improving its anti-corrosion performance, wear resistance, and weather resistance.Plasma enhanced chemical vapor deposition technology can deposit coatings with specific functions on plastic surfaces, such as antibacterial and chemical corrosion resistance. Plasma polymerization modification technology can regulate the hydrophilicity, oiliness, and anti fouling properties of plastic surfaces through the formation of polymer layers.

Plasma surface modification technology still faces some challenges.Firstly, further research is needed to optimize the parameters of plasma treatment in order to achieve optimal regulation of plastic surface properties. Secondly, the consistency and stability of the plasma treatment process also need to be addressed. In addition, suitable plasma treatment methods and suitable plasma equipment need to be developed for different types of plastic materials.

Electrochemical impedance spectroscopy is based on the kinetic process of electrochemical reactions. By applying a small amplitude AC signal in the electrochemical system and measuring the response, information on charge transfer and charge transfer is obtained. In electrochemical systems, when an external alternating current signal passes through an electrolyte solution, there will be a phase difference between the current and voltage, known as impedance.The magnitude and phase difference of impedance vary with frequency, forming an impedance spectrum of frequency response.

In electrochemical impedance spectroscopy, the commonly used electrochemical technology is AC analysis. By measuring the current and voltage responses under alternating current signals within the frequency range, the impedance spectrum of the electrochemical system can be obtained.The impedance spectrum is usually represented in complex form and consists of the real part (resistance) and the imaginary part (reactance). The real part represents the direct relationship between current and voltage, reflecting the charge transfer process, while the imaginary part represents the phase difference, reflecting the kinetics of electrochemical reactions.

The measurement of electrochemical impedance spectroscopy involves two main steps: applying an AC signal and measuring the response. Common electrochemical impedance spectroscopy measurement devices are electrochemical workstations or impedance spectrometers. The following are typical measurement steps:

Set measurement conditions, including frequency range, amplitude and type of AC signal, electrode area, and electrolyte solution.

Apply AC signal: Apply AC signal to the electrochemical system based on the selected frequency range and signal type. Common signal types include sine wave, square wave, and multi frequency scanning signals.

Measurement response: Measure the current and voltage responses and record them.Usually, potential scanning or potentiostatic methods are used for measurement. Measure the amplitude and phase difference of current and voltage at each frequency point.

Obtain impedance spectrum: By calculating the ratio of current to voltage,Obtain the impedance value at each frequency point. The impedance spectrum can be represented in complex form and displayed in amplitude phase diagram or real imaginary part diagram.

Data processing and analysis: Process and analyze the measured impedance spectra to obtain information about the electrochemical system. Common analysis methods include equivalent circuit model fitting, Bode plot analysis, Nyquist plot analysis, and related electrochemical parameter calculations.

The impedance spectra measured by electrochemical impedance spectroscopy provide rich information, which can be used to study the properties of electrochemical interfaces, charge transfer mechanisms, electrode reaction rates, etc.Common data analysis methods include:

Equivalent circuit model fitting: Fit the actual impedance spectrum with the equivalent circuit model to extract the parameters of the electrochemical system. Commonly used equivalent circuit models include Randles equivalent circuit, Warburg component, and double layer capacitor model.

Bode diagram analysis: By drawing Bode diagrams of amplitude frequency characteristics and phase frequency characteristics,Can analyze the frequency response of electrochemical systems. The amplitude frequency characteristics reflect the electrode reaction rate and charge transfer process, while the phase frequency characteristics reflect the interface reaction kinetics.

Nyquist diagram analysis: By drawing Nyquist diagrams, the interface characteristics and charge transfer mechanisms of electrochemical systems can be analyzed. Nyquist graphs consist of real and imaginary parts,Provides information on interface impedance, charge transfer resistance, and interface capacitance.

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Electrochemical impedance spectroscopy has wide applications in materials science and related fields. Here are some typical application cases:

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Catalyst research:,

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Author's viewpoint

,,,XThe comprehensive application of these evaluation methods can comprehensively and accurately evaluate the anti-corrosion performance of Graphene Polyaniline nanocomposites.

References

1. ,. [J]. ,2015,31(3)186-191.
2. ,,,. [J]. ,2014,30(6)1115-1122.
3. ,,,. [J]. ,2017,41(7)40-44.

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