Non-destructive cathodic disbondment testing of pipewrap coatings and apparatus

Abstract From the Canadian patent

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 …