Electrochemical test

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Electrochemical impedance spectroscopy (EIS) analysis

Apply a small amplitude alternating current potential wave with different frequency to the electrochemical system, and measure the ratio of alternating current potential to current signal (the ratio is the impedance of the system) with the change of sine wave frequency ω, or the change of impedance phase angle Φ with ω. Furthermore, the electrode process dynamics, double layer and diffusion are analyzed, and the mechanism of electrode material, solid electrolyte, conductive polymer and corrosion protection are studied.

Electrochemical comprehensive tester

Parameter: scanning frequency range: 1 × 10-5 ～ 1 × 106hz output voltage: ± 100V output current: ± 1A

Functional use: mainly used for testing electrochemical reaction process. It can be used for cyclic voltammetric scanning, constant current / constant voltage, dynamic potential / current scanning, potential / current step, current charge and discharge and other conventional electrochemical tests and AC impedance experiments.

Measurement and analysis of electrochemical noise

Electrochemical noise (EN) refers to the random non-equilibrium fluctuation of the electrical state parameters (such as electrode potential, external current density, etc.) during the evolution of electrochemical dynamic system. It is a nondestructive monitoring technology in situ. According to the different apparent current or voltage signals detected, electrochemical noise can be divided into current noise or voltage noise. The analysis methods include frequency domain analysis and time domain analysis. Common time-frequency conversion techniques in frequency domain analysis include fast Fourier transform (FFT), maximum entropy method (MEM), wavelet transform (WT).

polarization curve

The relation curve between electrode potential and polarization current or polarization current density. If the electrodes are anodes or cathodes, the resulting curves are called anodic polarization curves or cathodic polarization curves respectively. The polarization curve is divided into four regions: active dissolution region, transition passivation region, stable passivation region and over passivation region. The analysis and study of polarization curve is one of the basic methods to explain the basic law of metal corrosion, reveal the mechanism of metal corrosion and explore the way to control corrosion.

electrochemical corrosion

Versastat MC, AMETEK group, USA

Performance parameters:

1. Polarization range of ± 650ma / ± 10V;

2. 2A current output is optional, up to 20A;

3. The current resolution of 120fa and good current measurement accuracy (± 0.2%);

4. Built in FRA frequency response analyzer, frequency range 10 μ hz-1mhz.

Function purpose:

1. Support corrosion application in electrochemical testing technology:

1) Linear polarization resistance and Tafel analysis (corrosion current, polarization resistance RP, corrosion rate and other parameters);

2) Electrochemical impedance (fast, nondestructive test);

3) Electrochemical impedance of various polarization, through the electrochemical impedance information to explore the corrosion mode, fitting the equivalent circuit.

2. Research on chemical power supply, fuel cell and super capacitor

3. Sensor research: MC can be used to describe potential amplifier, current amplifier and biosensor due to its excellent current measurement accuracy.

4. Bioelectrochemical research: DC corrosion analysis technology is usually used to study the corrosion behavior of pseudomaterials. With the continuous progress and development of new alloy materials and filling materials technology, corrosion still exists and causes damage. MC can be widely used in corrosion research by potentiodynamic polarization test according to ASTM fr129 standard.

5. Routine test and teaching research: MC workstation only needs very low consumables and simple use. Powerful electrochemical testing technology is used in electrochemical research and basic teaching experiment demonstration. MC software has powerful function and can set complex experimental conditions. The software is convenient and easy to master.

6. Studio software supports a full range of electrochemical workstations, including large current expansion and current amplification equipment.

External services:

The following tests may be carried out at room temperature up to 1200 ° C:

1. Electrochemical impedance spectroscopy; 2. Potentiodynamic / current scanning;

3. 4. Corrosion potential;

5. 6. Current charge and discharge;

7. 8. Corrosion and protection;

9. Electrodeposition / plating.