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03048 NEW FUSION BONDED THERMOPLASTIC EPOXY FOR PIPELINE COATING

Picture for 03048 NEW FUSION BONDED THERMOPLASTIC EPOXY
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Product Number: 51300-03048-SG
ISBN: 03048 2003 CP
Author: V. Sauvant-Moynot, S. Duval and J. Martin
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New coating materials and processes dedicated to high temperature fields have been developed in order to provide external corrosion protection of pipes up to 170 °C. This latter requirement has also emphasized the need to have in place test facilities and protocols that can be used to ensure adequate evaluation of properties and also to establish whether such coating systems are fit-for-purpose. An original test protocol has been developed to evaluate the coating process and properties up to high temperatures and discuss their compatibility with the cathodic protection system in service conditions. This paper describes the coatings and the results which have been obtained from this approach. First, the monitoring of formulation processing and cure is performed by electrochemical impedance spectroscopy which provides in situ, continuous and non destructive measurements. High temperature impedance measurements are also carried out to define the upper service temperature in sea water, and adhesion tests are performed after immersion in representative environments in complement to cathodic disbonding tests under ASTM-G42. Finally, dynamic mechanical measurements are discussed with regards to polypropylene behavior. Key-words: organic coatings, high temperature, pipeline, cathodic protection, electrochemical impedance spectroscopy
New coating materials and processes dedicated to high temperature fields have been developed in order to provide external corrosion protection of pipes up to 170 °C. This latter requirement has also emphasized the need to have in place test facilities and protocols that can be used to ensure adequate evaluation of properties and also to establish whether such coating systems are fit-for-purpose. An original test protocol has been developed to evaluate the coating process and properties up to high temperatures and discuss their compatibility with the cathodic protection system in service conditions. This paper describes the coatings and the results which have been obtained from this approach. First, the monitoring of formulation processing and cure is performed by electrochemical impedance spectroscopy which provides in situ, continuous and non destructive measurements. High temperature impedance measurements are also carried out to define the upper service temperature in sea water, and adhesion tests are performed after immersion in representative environments in complement to cathodic disbonding tests under ASTM-G42. Finally, dynamic mechanical measurements are discussed with regards to polypropylene behavior. Key-words: organic coatings, high temperature, pipeline, cathodic protection, electrochemical impedance spectroscopy
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