The present trend in establishing an effective level of external metallic surface corrosion control is the application of a barrier coating or adhesive on the metallic surface prior to the application of a thermal insulating material. Experience has shown that there is generally a limited beneficial effect from the application of cathodic protection (CP) to a bare or ineffectively coated metallic surface under thermal insulation.
NACE 10A392
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Effectiveness of Cathodic Protection on Thermally Insulated Underground Metallic Structures
National Association of Corrosion Engineers , 09/01/2006