10035 What's Right with "850 On", What's Wrong with "850 Polarized", & How We Can Improve Them Both

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Product Number: 51300-10035-SG

ISBN: 10035 2010 CP

Author: Whitt L. Trimble

Publication Date: 2010

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Cathodic Protection is a corrosion mitigation practice that is used to insure the mechanical integrity of critical steel structures such as pipelines, storage tanks, ship’s hulls, bridges, etc. Sufficient cathodic protection current prevents galvanic corrosion between steel and an electrolytic environment but determining the adequacy of the level of cathodic protection at the steel-to-electrolyte interface directly is difficult. As such, NACE International (NACE) and several other industry associations have developed standard practices that detail consensus criteria to determine indirectly, whether or not cathodic protection of a structure has been achieved. While the usage of these criteria has greatly reduced the incidence of integrity failures of steel structures due to galvanic corrosion, no single criterion has proven to be universally usable and reliable. There is currently an ongoing effort within NACE to review and improve cathodic protection criteria performance. Two of the existing NACE cathodic protection criteria are commonly referred to as “850 On” and “850 Polarized”. This paper will discuss the basis for these cathodic protection (CP) criteria, their individual strengths and weaknesses, the need for both, and how the utilization of both can be improved by NACE and by CP practitioners.

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