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06043 DETERMINING THE CP SHIELDING BEHAVIOR OF PIPELINE COATINGS IN THE LABORATORY

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.

Product Number: 51300-06043-SG
ISBN: 06043 2006 CP
Author: G.R. Ruschau, Y.Chen
Publication Date: 2006
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The relative tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Four types of liquid coatings: epoxy, epoxypolyurethane, polyurethane, and wax were investigated, with fusion bond epoxy (FBE) and a polyethylene shrink sleeve used for comparison. The 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. For all coatings, micro-defects were found to be associated with the blisters, and it is believed that these defects were necessary to allow effective CP under disbonded coatings.

Key words: coating, CP shielding, EIS, blistering

The relative tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Four types of liquid coatings: epoxy, epoxypolyurethane, polyurethane, and wax were investigated, with fusion bond epoxy (FBE) and a polyethylene shrink sleeve used for comparison. The 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. For all coatings, micro-defects were found to be associated with the blisters, and it is believed that these defects were necessary to allow effective CP under disbonded coatings.

Key words: coating, CP shielding, EIS, blistering

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