Sealer coatings for thermal-sprayed aluminum in the offshore industry (Reprinted)

Thermal-sprayed aluminum has been applied to many components in offshore projects. Vinyl etch primer and aluminum-pigmented silicone, <25-mu m (1-mil) thick, are the traditional coatings used to seal the porosity inherent in the thermal-spraying process. At this low film thickness, aluminum silicon sealer is difficult to see, causing problems both for the sprayer and inspectors. Two-pack epoxy sealers are alternatives. Development testing currently is aimed at comparing solvent-based and water-based epoxies for this use.