Electrochemical impedance spectroscopy

1. UNVIRCITYOFTRIPOLI
1
Material Since Engineering
Rehab Ali Alnaily
Under supervision of
Dr . Elarbi Khalil
Electrochemical
ImpedanceSpectroscopyEISof
organiccoatedmetals

2. Definitions
Experimental Setup
ELEMENTS

3. Cathodic
Protection
Introduction
Many factories and factories stand the test in the face of many
difficulties resulting from the corrosion of metals, causing many
losses.
These industries and establishments have been completely and
fundamentally dependent on the use of minerals, especially
carbon steel.
Corrosion Control
Surface
Coating
Design
Rules
Material
Selection
Anodic
Protection.
Changing
Environment

4. COATING
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Introduction

5. What is
Impedance
, Z ?
1.Follows Ohm’s Law at
all current & voltage
Levels.
2.Its Resistance is
independent of
frequency.
3.AC current & Voltage
Signals are in phase.
Definitions
Ideal
Resistor?
Pseudo-linear
system
For ideal Resistor, usually
Ohm’s law is used to
express the resistance to
current flow.
The impedance is simply
defined as the opposition
(‫أوالممانعة‬ ‫)المعاوقة‬ to the
current flow.
In fig , by looking at the small portion of
current VS Voltage curve, the
correlation appears to be Linear.
To make impedance measurement ,
small voltage signal ( between 5-50 mv)
is applied to
Specimen over a range of frequencies
( 0.01HZ TO 100,000 HZ).
Electrochemical cell are not linear
doupling voltage doesn’t necessarily
double The current .

6. •Requires large perturbation
signal (may disturb system ).
•Many fail in low conductivity
media .
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AC
DC
Corrosion
Testing
gravimetric
•Use small perturbation
signal ( minimal disturbance)
•Can investigate in low
conductivity media
Why EIS ?

7. The coating capacity is
given by :
when a metal is coated with a polymer- coating,
and exposed to aqueous solutions.
The measured capacitance of coating is found to
increase with time, due to the absorption of water
by the coating.
Єₒ = permittivity of vacuum 8.86
X 10-14 f/am
A = area of coating m2
d = thickness of coating m
Є = dielectric constant of coating
Where:
Testing Coated Metals

8. potentiostate
Corrosion Cell:
RE:
CE:
WE:
Electrolyte:
Computer
System
Couple
Experimental Setup

9. EIS Measurement
Run
Experiments
Editing
Experimental
Use Echem
Analysis
Software
To analyses
data
1 2 3

10. Run Experiments

11. EIS Measurement
Run
Experiments
Apply small amplitude
voltage signal (10mv)
To specimen over rang
of frequencies
0.01 HZ to 100,000HZ
Editing
Experimental
•Install EIS300 software on PC
•EIS300 use the GAMRY FRAMEWORK
For Data acquisition .
Use Echem
Analysis
Software
To analyses
data

12. This technique has more
applications such as :
01 Battery Development
02 Sensor Evaluation
03 Paint Testing
04 Photo Voltaic
05 Biochemistry
EISApplications

13. Thankyoufor