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Equivalent Circuit Model Fitting in Electrochemical Impedance Spectroscopy (EIS) for Protective Coating Evaluations

Picture for Equivalent Circuit Model Fitting in Electrochemical Impedance Spectroscopy (EIS) for Protective Coating Evaluations
Available for download
Product Number: 51321-16267-SG
Author: Bing Yuan; Martin Stephen; Muni Ramakrishnan
Publication Date: 2021
$0.00
$20.00
$20.00

EIS (Electrochemical Impedance Spectroscopy) technique has been used in many areas such as
biosensors, battery development, fuel cell development etc. Many efforts have also been made to apply
this technique to paint/coating evaluations. The epoxy industrial coatings containing fillers or ceramic
beads are commonly used in chemical processing, Mining/Mineral & Ore processing, Oil/gas, Power
(fossil, hydroelectric, and nuclear), water/waste water, etc. These coatings provide excellent corrosion
and erosion resistance for metal and concrete surfaces. EIS is a useful tool to investigate
corrosion/erosion resistance of these protective coatings under various environment conditions.
EIS can measure impedance of coatings and phase angle of imposed AC voltage/current. The changes
in impedance and phase angle can be used as indicators of coating structure changes caused by
corrosion, erosion, water penetrations, etc. There are various ways to analyze EIS data to correlate the
data with the performance of paint/coating products but these methods all have limitations when used
to evaluate high performance protective coatings. In this presentation, we discussed the limitations of
commonly used EIS data analysis methods. A modified CPE model is proposed to evaluate high
performance protective coatings on water/chemical penetrations and/or surface deteriorations due to
corrosion and/or erosion.

EIS (Electrochemical Impedance Spectroscopy) technique has been used in many areas such as
biosensors, battery development, fuel cell development etc. Many efforts have also been made to apply
this technique to paint/coating evaluations. The epoxy industrial coatings containing fillers or ceramic
beads are commonly used in chemical processing, Mining/Mineral & Ore processing, Oil/gas, Power
(fossil, hydroelectric, and nuclear), water/waste water, etc. These coatings provide excellent corrosion
and erosion resistance for metal and concrete surfaces. EIS is a useful tool to investigate
corrosion/erosion resistance of these protective coatings under various environment conditions.
EIS can measure impedance of coatings and phase angle of imposed AC voltage/current. The changes
in impedance and phase angle can be used as indicators of coating structure changes caused by
corrosion, erosion, water penetrations, etc. There are various ways to analyze EIS data to correlate the
data with the performance of paint/coating products but these methods all have limitations when used
to evaluate high performance protective coatings. In this presentation, we discussed the limitations of
commonly used EIS data analysis methods. A modified CPE model is proposed to evaluate high
performance protective coatings on water/chemical penetrations and/or surface deteriorations due to
corrosion and/or erosion.

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Substrate preparation which includes the removal of contaminates, abrading or etching to create a surface profile via mechanical or chemical methods have a major impact on the adhesion performance of applied coatings. For coatings, a primary performance characteristic is adhesion after exposure to corrosive environments. One of the consequences of corrosion forming under a coating is the loss of adhesion or delamination of the coating. 
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Electrochemical impedance spectroscopy (EIS) is used to evaluate the influence of a topcoat to impact corrosion protection after accelerated exposure testing (QUV, xenon arc, Prohesion). The ability to monitor early undercoat corrosion, at progressive stages of the accelerated weathering tests, was a major factor in selecting the EIS testing method. 
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