SSPC Tech Feature | June 2009

Performance of Marine Coatings Applied over Flash Rusted Surfaces

Impact of "flash rusting" on the coating life after UHP waterjetting reviewed.

Summary:
This paper evaluates coatings applied over moderate to light flash rust on four US Navy ship hulls. The coatings were applied to surfaces prepared with closed-loop UHPWJ systems on broad areas and hand lance UHPWJ with minimal secondary surface preparation in complex hull areas. Inspections took place after up to six years in service.

None of the visual or physical inspections reviewed here revealed differences in performance after five or six years that could be attributed to the different waterjetting surface preparation processes (closed-loop UHP vs hand-lance). This suggests that secondary surface preparation to remove moderate flash rust is probably unnecessary after hand-lance waterjetting with the procedures used by the shipyard.

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