Cathodic Protection of Underground Pipeline by Polyurethane Coating

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Rajabpour, Foroud | 2012

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Type of Document: M.Sc. Thesis
Language: English
Document No: 45706 (57)
University: Sharif University of Technology, International Campus, Kish Island
Department: Science and Engineering
Advisor(s): Dolati, Abolghasem
Abstract:
Selection of appropriate coating system is the most important subject in corrosion control of buried pipelines. Corrosion control of buried pipelines is achieved by using a combination of barrier coatings and cathodic protection (CP). Applying barrier coating can decrease the protection current of CP. However, at the coating holidays the pipeline act as cathode generating hydroxyl ion and hydrogen electrochemically. Therefore the selected coating should be compatible with the alkaline condition.This research focuses on evaluating of an epoxy-tar and a urethane-tar based coating. Coatings performance has been tested by accelerated corrosion test methods (i.e. Salt spray according to ASTM B117, 100% humidity cabinet according to ASTM D2247 and cathodic disbanding according to ASTM G8) in contract between protective properties of two coatings, polyurethane is better than coltar epoxy
Keywords:
Cathodic Protection ; Cathodic Disbonding ; Polyurethane ; Polyurethane Coating ; Epoxy Coating

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