Technical Report on the Application and Interpretation of Data from External Coupons Used in the Evaluation of Cathodically Protected Metallic Structures

Published by	Publication Date	Number of Pages
NACE	02/01/2001	20

Category: NACE

Description

NACE 35201 – Technical Report on the Application and Interpretation of Data from External Coupons Used in the Evaluation of Cathodically Protected Metallic Structures

CP coupons have been used since the 1930s by several ofthe pioneers of the corrosion-control industry, both in NorthAmerica and in Europe. Over the last two decades, the useof CP coupons has been rediscovered as a practicalmethod to determine the level of polarization of a buriedstructure and to confirm the voltage drop in a potentialmeasurement. Acceptance of CP coupon technology isslowly occurring. Research sponsored by the pipelineindustry has explored the use of CP coupons and hashelped validate the use of this technology. The purpose ofthis technical committee report is to provide an alternative tothe conventional evaluation of the effectiveness of a CPsystem.