A team assembled by a major oil company designed a test program to assess the difference in coating performance between dry abrasive blasting and Waterjetting as surface preparation methods. They were also interested in determining whether using flash rust preventing, decontamination chemical in conjunction with various applications had any effect on coating performance. A glass flake epoxy was used. Panels were treated with 262 MPa (38,000 PSI) Waterjetting, Dry Garnet Blast + Power wash, in both cases with and without a decontamination chemical. Another set of panels was sprayed with ASTM D11413  seawater salt spray after treatment and then coated.

The 300 mm X 600 mm coated panels were saw cut into smaller panels. Some were subjected to per ISO 203401  Ageing Procedure Annex A and ISO 2812-25  Seawater Immersion. Others were submitted to ASTM G 504  long-term field exposure test over 5 years. In both cases, when the decontamination chemical was used, no significant difference in coating performance was detected, including in panels exposed to light seawater mist spray before coating application. The scribed waterjetted panels exhibited more undercreep than abrasive blasted panels, but this undercreep only began to develop after two years.

Subject
Test methods, Coatings, Adhesives, Salts, Surface preparation, Glass flake coatings, Garnet, Water jetting, Mechanical failure, Adhesion testing, Maintenance, Epoxies, Adhesion
Keywords:
surface preparation, waterjetting, glass flake epoxy, epoxy, flash rust, salt removal, chloride test, ISO 20340, ASTM G 50, ISO 12944-9
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2022
Association for Materials Protection and Performance (AMPP)
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