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EIS Study on the Behavior of High Performance Topcoats Over Metal Substrates

EIS Study on the Behavior of High Performance Topcoats Over Metal Substrates
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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. 

Product Number: 51219-201-SG
Author: Donald C. Lawson III
Publication Date: 2019
Industry: Coatings
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$20.00
$20.00

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. We compare various resin chemistries, typically used for high performance topcoats, for any contribution to the corrosion protection of the metal substrate. In this study, we compare commercially available two-component topcoat systems. This paper examines the performance of FEVE, polyurethane, and polysiloxane topcoat systems to provide additional corrosion protection for metal substrates.

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. We compare various resin chemistries, typically used for high performance topcoats, for any contribution to the corrosion protection of the metal substrate. In this study, we compare commercially available two-component topcoat systems. This paper examines the performance of FEVE, polyurethane, and polysiloxane topcoat systems to provide additional corrosion protection for metal substrates.

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Product Number: 51220-257-SG
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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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Assessing the Influence of Coating Thickness on its Mechanically Induced Loss of Integrity

Product Number: 51317--9294-SG
ISBN: 9294 2017 CP
Author: Shyama Ranade
Publication Date: 2017
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A new method for in situ measurement of loss of coating integrity.  Tensile samples with pipeline coatings of thicknesses from 250 to 2000 μm were subjected to tensile elongation, electrochemical impedance measured before and after.  Confirmed with techniques such as optical microscopy.
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