CS350 / Galvanostat (electrochemical workstation) contains a fast digital function generator, high-speed data acquisition circuitry, a potentiostat and a galvanostat. With high performance in stability and accuracy with advanced hardware and well-functioned software, it is a comprehensive research platform for corrosion, batteries, electrochemical analysis, sensor, life science and environmental chemistry etc.

APPLICATION  Corrosion mechanism of metals in water, concrete and soil, etc.  Batteries (Li-ion battery, solar cell, fuel cell, super capacitors), new materials, photoelectronic materials;  Electrochemical analysis and sensor;  Reaction mechanism of electrosynthesis, electrodeposition (electroplating), anodic oxidation, etc.  Fast evaluation of corrosion inhibitor, water stabilizer, coating and cathodic protection.

HARDWARE  Dual-channel high-speed 16bit/high-accuracy 24bit AD converter;  Built-in frequency response analyzer(FRA), frequency range: 10μHz~1MHz;  Built in high-power Potentiostat/Galvanostat/Zero resistance ammeter(ZRA);  Voltage control range: ±10V; Compliance voltage: ±21V ( expandable to ±200V);  Current control range: ±2A (expandable to ±5A);  Potential resolution: 10μV; current resolution 10pA (expandable to 100fA).

1 SOFTWARE CorrTest® software provides users a versatile smoothing/differential/ integration kit, which can complete the calculation of peak height, peak area and peak potential of CV curves. CorrTest® kit also provide powerful non-linear fitting on Butler-Volmer equation of polarization curve. It can calculate Tafel slope, corrosion current density, limitation current, polarization resistance, corrosion rate. It can also calculate the power spectrum density, noise resistance and noise spectrum resistance based on the electrochemical noise measurements. CorrTest® kit has a built-in versatile timing policy for combined measurements, which can facilitate the automation of experiments and save time.

2 TECHNICAL FEATURES 1. Impedance (EIS) CS workstation applies dual-channel sampling technique, and has strong ability of anti-interference. It is particularly suitable for AC impedance measurement of high resistance system (>109Ω, such as coating, concrete etc.). It can also be used to plot Mott-Schottky curve and differential capacitance curve. The software can achieve real-time display of OCP.

EIS of AA6063 Al alloy in Ce3+ containing 3% NaCl Polarization curve of Ti-based amorphous alloy & solution stainless steel in 3%NaCl solution

2. Polarization curve It can measure linear polarization curve and Tafel curve. The user can set the anodic reversing current (passivation film breakdown current) of the cyclic polarization curve, in order to determine material’s pitting potential and protection potential, and evaluate the susceptibility to inter-granular corrosion. The software uses non-linear fitting algorithm to analyze polarization curve, and can make fast evaluation for materials’ anti-corrosion ability and corrosion inhibitor’s performance.

3. It can do the following electro-analysis methods: (LSV), (CV), Staircase Cyclic Voltammetry (SCV), Square wave voltammetry (SWV), Differential Pulse Voltammetry (DPV), AC voltammetry (ACV), Stripping voltammetry etc. It can also calculate the integrated peak area, peak current and analyze standard curve.

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CV curve of Pt in 3 mmol/L K4[Fe(CN)6]+ CV curves in three-electrode cell of PPy in

0.4 mol/L KCl（100mV/s） 0.5 mol/L H2SO4 (50 mV/s)

4. Electrochemical Noise With high-resistance follower and zero-resistance ammeter, it measures the spontaneous fluctuation of potential/current in corrosion system. It can be used to study local corrosions such as pitting, galvanic corrosion, crevice corrosion, and stress corrosion cracking. Through noise spectrum, it can evaluate the cause, grow and death of some metastable pitting and cracking. Based on calculation of noise resistance and pitting index, it can do local corrosion monitoring.

Electrochemical noise of low-carbon steel in 0.05mol/L - 5. Power expansion Cl +0.1mol/L NaHCO3 For CS workstation, the current control range is ±2.0A, and compliance voltage is ±21V. It can meet needs of the following fields: charge and discharge of fuel battery and high-power battery, electrolysis and electrodeposition etc. Using special power expander, the maximum current output can be up to ±5A, and compliance voltage is expandable to ±200V. 6. Full floating measurement CS workstation uses full-floating . It can be used in autoclave electrochemical test (autoclave body is grounded), on-line corrosion study of metallic components in the earth (bridge, concrete steel, etc.) 7. User-defined methods The user can set timing measurements to circularly proceed a certain test method or multiple methods. It’s suitable for unattended auto timing measurements.

4 HARDWARE SPECIFICATIONS

Potential control range: ±10V Current control range: ±2A

Potential control accuracy: 0.1%×full range±1mV Current control accuracy: 0.1%×full range

Potential resolution: 10μV (>100Hz), 3μV (<10Hz) Current sensitivity: <10pA

Potential rise time: <1μs (<10mA), <10μs (<2A) Current range: 200nA ~2A, 8 ranges

Reference electrode input impedance: 1012Ω||20pF Maximum current output: 2A

Compliance voltage: ±21V Current increment during scan: 1mA@1A/ms

CV and LSV scan rate: 0.001mV~10,000V/s Potential increment during scan: 0.076mV@1V/ms

CA and CC pulse width: 0.0001~65,000s DPV and NPV pulse width: 0.0001~1000s

SWV frequency: 0.001~100 kHz Minimum potential increment in CV: 0.075mV

AD data acquisition: 16bit@1 MHz,20bit@1 kHz Potential and current range: automatic

DA resolution: 16bit, setup time: 1μs Low-pass filters: covering 8-decade

Communication Interface: USB2.0 Instrument net weight: 6.5Kg Operating System: Windows 2000/XP/ Instrument dimension(cm): 36.5(W)X30.5 (D)X16 (H) Win7/Win8/Win10 EIS

Signal generator

Frequency range: 10μHz~1MHz AC signal amplitude: 1mV~2500mV

Frequency accuracy: 0.005% Signal resolution: 0.1 mV RMS

Output impedance: 50Ω DC Bias: -10~+10V Waveform: Sine wave, triangular wave and square Wave distortion: <1% wave

Scan mode: Logarithmic/linear, increase/decrease

Signal analyzer

Integral time: maximum: 106 cycles or 105s Measurement delay: 0~105s

Integral time: mnimum: 10ms or the longest time of a cycle

DC offset compensation

Potential automatic compensation range: -10V~+10V Current compensation range: -1A~+1A Bandwidth: 8-decade frequency range, automatic and manual setting

5 CS350 Software / Electrochemical Techniques Stable polarization Open Circuit Potential (OCP) Potentiostatic (I-T Curve) Galvanostatic Potentiodynamic (Tafel) Galvanodynamic (DGP) Transient polarization Multi-Potential Steps Multi-Current Steps Potential Stair-Step (VSTEP) Galvanic Stair-Step (ISTEP) Chrono Methods Chronopotentiometry (CP) (CA) Chronocoulometry (CC) Cyclic Voltammetry Linear Sweep Voltammetry (LSV) Cyclic Voltammetry (CV) Staircase Voltammetry (SCV) Differential Pulse Voltammetry (DPV) Normal Pulse Voltammetry (NPV) Square wave voltammetry (SWV) AC voltammetry (ACV) Differential Normal Pulse Voltammetry (DNPV) 2nd Harmonic A. C. Voltammetry (SHACV) Stripping Voltammetry Potentiostatic stripping Linear stripping Staircase stripping Square wave stripping

EIS (Electrochemical impedance spectroscopy) EIS vs Frequency (IMP) EIS vs Time (IMPT) EIS vs Potential (IMPE) Corrosion Tests Cyclic polarization curve (CPP) Linear polarization curve (LPR) Electrochemical Noise (EN) Zero Resistance Ammeter (ZRA) Hydrogen diffusion (HDT) Battery test Battery charge and discharge Galvanostatic charge and discharge(GCD) Extensions Rotating ring-disk Electrode Data Logger Waveform generator Disc machine control

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