Non-destructive cathodic disbondment testing of pipewrap coating

Details Non-destructive cathodic disbondment testing of pipewrap coating Non-destructive cathodic disbondment testing of pipewrap coating

1982-11-01

1985-03-12

Weisstuch, Aaron

Chemistry: electrical and wave energy

Processes and products

204147, 436 6, 204196, G01N 2730, G01N 2746

Patent

active

045043655

ABSTRACT:
A method and apparatus herein is disclosed that consists of establishing and equilibrating a circuit path through a working test pipe electrode and a counter electrode in an electrolyte fluid in which said test pipe electrode achieves a state of cathodic protection. Disconnecting said cathodically protected working test pipe electrode from said counter electrode. Then re-establishing a circuit path through said working test pipe electrode, said counter electrode, and a reference electrode, in said electrolyte fluid along with an electronic control and measuring means. Subsequently causing a measured known voltage step to be applied to said working test pipe electrode. Then measuring the current flowing after application of said measured applied voltage step. Finally, then analyzing said current flow data and thereby determining the double layer capacitance at the interface between said working test pipe electrode and said electrolyte fluid as a measure of disbonded area thereon.

REFERENCES:
patent: 4095176 (1978-06-01), Maes et al.
patent: 4130464 (1978-12-01), Kanno et al.
A. J. Bard et al., "Electrochemical Methods", Wiley (1980), pp. 10-11 and 136-137.
"Electrochemical Techniques for Corrosion", National Association of Corrosion Engineers (1977), pp. 61-65, J. H. Payer Electrochemical Methods for Coatings Study & Evaluation.
L. F. G. Williams, "Automatic Corrosion Rate Monitoring of Metals in Solution," J. Electrochem. Soc., vol. 127, pp. 1706-1709 (1980).

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