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10163 Evaluation of Protective Performance of Organic Coatings Using Current Interrupter

Picture for 10163 Evaluation of Protective Performance of Organic Coatings Using Current Interrupter
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Product Number: 51300-10163-SG
ISBN: 10163 2010 CP
Author: Hiroyuki Tanabe
Publication Date: 2010
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$20.00
A variety of electrochemical techniques has been used for the evalutaion of protective performance of coated steel. For example, one of them is electrochemical impedance spectroscopy. (EIS) Each method has its own characteristic and is suitable to determine some kinds of anti-corrosive mechanisms of coating film. We developed a new evaluation method of protective coatings using current interrupter technique.

Generally the equivalent circuit of coated steel is simplified as a connection of the resistance of test solution. the impedance of paint film and impedance of mild steel surface in series. When the time constant of the paint film is much smaller and very different from that of the metal substrate as coated steel in general, the two equivalent circuits can be separated from each other.

Thus the polarization resistance of metal substrate was determined by separating the measured paint film impedance from the metal substrate impedance.

Electrochemical parameters can be measured by using current interrupter technique. Results of protective coating performance obtained by some experiment were discussed.

KEYWORDS: Current interrupter technique. coating. under-film corrosion tester. electrochemical method, polarization resistance, coated steel
A variety of electrochemical techniques has been used for the evalutaion of protective performance of coated steel. For example, one of them is electrochemical impedance spectroscopy. (EIS) Each method has its own characteristic and is suitable to determine some kinds of anti-corrosive mechanisms of coating film. We developed a new evaluation method of protective coatings using current interrupter technique.

Generally the equivalent circuit of coated steel is simplified as a connection of the resistance of test solution. the impedance of paint film and impedance of mild steel surface in series. When the time constant of the paint film is much smaller and very different from that of the metal substrate as coated steel in general, the two equivalent circuits can be separated from each other.

Thus the polarization resistance of metal substrate was determined by separating the measured paint film impedance from the metal substrate impedance.

Electrochemical parameters can be measured by using current interrupter technique. Results of protective coating performance obtained by some experiment were discussed.

KEYWORDS: Current interrupter technique. coating. under-film corrosion tester. electrochemical method, polarization resistance, coated steel
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