Two pipes were contaminated with chloride at various levels. One was coated without removing the contamination, the other was coated after decontaminating it with phosphoric acid. A third pipe, not contaminated, was treated with phosphoric acid before coating. The chloride levels were measured using an extraction-sampling technique and ASTM D 512 Method A for analysis. Residual phosphorus was also measured using an x-ray fluorescence procedure. Hot cathodic disbonding resistance is adversely affected in direct proportion to the level of chloride contamination. The data suggest a maximum level of 2.0 microgram/cm2 measured by extraction on a blast-cleaned surface is essential for good coating performance. Residual phosphorus levels may adversely affect cathodic disbonding, but appear to enhance water resistance. Data on the accuracy of the chloride measurement procedure is presented, together with information on other methods for determining chloride.
Chloride contamination on line pipe: the effect on FBE coating performance
Chlorid-Kontaminierung von Pipelines: Auswirkungen auf die Güte der FBE-Beschichtung
Corrosion Prevention and Control ; 42 , 3 ; 63-69
1995
7 Seiten, 9 Bilder, 6 Tabellen, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
Verunreinigung , Reinheit , Pipeline , unlegierter Stahl , Lochkorrosion , Korrosionsmechanismus , Chlorid , Sandstrahlen , Phosphorsäure , Waschen , Dekontaminierung , Korrosionsschutzschicht , Schutzüberzug , plastiküberzogener Stahl , Haftfestigkeit , Wassertransport , Wasserdampf , Bodenkorrosion , Schadenanalyse , chemisches Reinigen , Schutzschicht
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