WG 9 Session C - DC Coupons and the Free Corrosion Potential
Date & Time
Tuesday, April 13, 2021, 2:45 PM - 4:15 PM


To foster spirited discussion surrounding the interpreted applications of assessing the level of polarization on a structure via coupons. Coupons can be used to approximate the measurement of polarized potentials by the “instant-off” technique without the need to interrupt all influencing CP sources. The continued electronegative shift in an “Instant-Off” potential (which closely approximates a polarized potential) with time, demonstrates increasing cathodic polarization. This change in potential results in an increase in the pH immediately adjacent to the protected structure. During, what is expected to be and engaging debate, the discussion will surround how the quantity of polarization is determined. Is it with respect to the de-polarized potential or the free corrosion potential? Audience engagement will be driven by framing the discussion and interjection of guiding thoughts to encourage spirited debate amongst attendees.

Who Should Attend?

This session should be attended by integrity professionals, persons involved in the application of Cathodic Protection, industry professionals and integrity managers.

Discussion Leader – Craig Stevenson P.Eng

Expected Outcome:

The expected outcome would be acknowledgement that established industry norms should be always met with a healthy skepticism that is ultimately questioned with sound data collection practices and engineering judgment when assessing conformance to an established criterion.

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Session Category
Working Group 9