engleski

Rust Converter with Improved Adhesion for Topcoats

Surface preparation before application of protective coatings to badly maintained aging industrial facilities is particularly challenging on constructions that, for a variety of reasons, may be unsuitable for abrasive or water blasting. Rust converters applied to hand/power tool cleaned surfaces, which together with topcoats, offer corrosion protective characteristics matching those of blasted specimen, are of imminent technological and economical interest. This paper investigates the performance of VpCI CorrVerter on, corroded specimens cut from an aged, heavily rusted industrial construction that was exposed to coastal atmosphere. The rusted surface of specimens was characterized by: metallographic, SEM/EDS, XRD, surface chlorides and surface roughness measurements. Manually cleaned rusted plates were treated with conventional tannin and phosphoric acid based converters and the VpCI CorrVreter. Plates were subsequently coated with alkyd, epoxy and polyurethane coatings. Measurement of the impedance of the coatings was carried out by electrochemical impedance spectroscopy. Adhesion of coatings was measured by pull-off" and cross-cut techniques. Performance of rust converters was rated by comparison to the hand tool cleaned specimen without rust converters and to the Sa 2 ½ sandblasted specimen.

Rust converter; surface preparation; protective coating; electrochemical impedance spectroscopy

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