In case of offshore platforms, they are operated for more than 30 years in severely corrosive environment. It is necessary to keep high quality coating performance for long-term operation period without appropriate maintenance.

The performance of coating is significantly influenced by its adhesion property to the substrate material and steel preparation is the essential first stage treatment of a substrate before the application of all kinds of coatings.

With regard to steel preparation, ISO 8501-3 specifies preparation grade of welds, edges and other area with surface imperfection. The interpretation of preparation grade varies depending on viewpoints of client superintendent because it is a visual assessment standard without quantitative grade.

To study the effect of surface imperfection affecting long-term durability of film performance on offshore coating system, carbon steel surfaces were prepared by various preparation grade based on ISO 8501-3 for weld profile, weld porosity and thermally cut edge.

This study deals with the correlation between surface imperfection and coating performance evaluated by NORSOK M-501 and ISO 20340 test method including ageing resistance test and sea water immersion test for 6 months.

Subject
Abrasive blasting, Coating performance, Coatings, Grinding, Water immersion, Surfaces, Surface preparation, Porosity, Immersion, Surface profile, Visual assessment, Durability, Coating systems
Keywords:
Off-shore platform, ISO 8501-3, surface imperfection, weld profile, weld porosity, thermally cut edge, NORSOK M-501, ISO 20340, ageing resistance, sea water immersion
© 2019 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2019
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.