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Performance of Marine Coatings Applied over Flash Rusted Surfaces

This paper investigates a key concern with Ultra High Pressure Waterjetting (UHPWJ) surface preparation – the impact of “flash rusting” on coating life. Flash rusting can occur under certain environmental conditions when the steel is left sufficiently wet following UHPWJ. Reducing or eliminating flash rusting can increase the cost of surface preparation. However, flash rust’s impact on coating life is debated. 

Product Number: 41209-465-SG
Author: J. Peter Ault, Steve Cogswell
Publication Date: 2009
Industries: Maritime , Coatings
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This paper investigates a key concern with Ultra High Pressure Waterjetting (UHPWJ) surface preparation – the impact of “flash rusting” on coating life. Flash rusting can occur under certain environmental conditions when the steel is left sufficiently wet following UHPWJ. Reducing or eliminating flash rusting can increase the cost of surface preparation. However, flash rust’s impact on coating life is debated. This paper presents an evaluation of coatings applied over flash rust on US Navy ship hulls. The coatings were inspected after up to six years in service. The results show that the coating performance over locations which had Moderate levels of flash rust was comparable to those with Light levels of flash rust.

This paper investigates a key concern with Ultra High Pressure Waterjetting (UHPWJ) surface preparation – the impact of “flash rusting” on coating life. Flash rusting can occur under certain environmental conditions when the steel is left sufficiently wet following UHPWJ. Reducing or eliminating flash rusting can increase the cost of surface preparation. However, flash rust’s impact on coating life is debated. This paper presents an evaluation of coatings applied over flash rust on US Navy ship hulls. The coatings were inspected after up to six years in service. The results show that the coating performance over locations which had Moderate levels of flash rust was comparable to those with Light levels of flash rust.

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