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09116 Causes of External Corrosion on Coated and Cathodically Protected Pipelines

Picture for 09116 Causes of External Corrosion on Coated and Cathodically Protected Pipelines
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Product Number: 51300-09116-SG
ISBN: 09116 2009 CP
Author: Richard Norsworthy
Publication Date: 2009
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Each time a pipeline is exposed and inspected companies should properly evaluate external corrosion to determine the reason why the corrosion occurred. Too many times external corrosion is blamed on lack of cathodic protection (CP), when there are other causes that are not properly evaluated. Proper evaluation of external corrosion includes using several methods to determine why external corrosion exists even though NACE criteria are met for cathodic protection at the site.

Case histories will be presented that discuss the causes of why coated pipelines with “adequate” cathodic protection continue to have external corrosion. In other cases, the CP may not seem to be adequate, but no corrosion is found. These case histories will show some of the proper techniques to evaluate external corrosion and what caused the corrosion to exist. Each type of coating has properties that can be defined as either CP “shielding” or “non-shielding”.

Key words: Cathodic protection, shielding coatings, non-shielding coatings, external corrosion, pipelines
Each time a pipeline is exposed and inspected companies should properly evaluate external corrosion to determine the reason why the corrosion occurred. Too many times external corrosion is blamed on lack of cathodic protection (CP), when there are other causes that are not properly evaluated. Proper evaluation of external corrosion includes using several methods to determine why external corrosion exists even though NACE criteria are met for cathodic protection at the site.

Case histories will be presented that discuss the causes of why coated pipelines with “adequate” cathodic protection continue to have external corrosion. In other cases, the CP may not seem to be adequate, but no corrosion is found. These case histories will show some of the proper techniques to evaluate external corrosion and what caused the corrosion to exist. Each type of coating has properties that can be defined as either CP “shielding” or “non-shielding”.

Key words: Cathodic protection, shielding coatings, non-shielding coatings, external corrosion, pipelines
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Penetration of Cathodic Protection into Pipeline Coating Disbondment

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An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
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06043 DETERMINING THE CP SHIELDING BEHAVIOR OF PIPELINE COATINGS IN THE LABORATORY

Product Number: 51300-06043-SG
ISBN: 06043 2006 CP
Author: G.R. Ruschau, Y.Chen
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The tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Epoxy, epoxypolyurethane, polyurethane, and wax were investigated.  Results showed that the liquid coatings, when applied extra thin to accelerate the kinetics of absorption and current transmission, all disbonded by blistering, and all allowed CP current to be transmitted.
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