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On the Topographical and Performance Effects of Underblasted and Reblasted Carbon Steel Substrate

On the Topographical and Performance Effects of Underblasted and Reblasted Carbon Steel Substrate
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In this study, the effect on coating corrosion resistance after remediating an under-blasted then remediated to standard preparation is undertaken. In this work, it is proposed to under-blast one set of panels (~1 mil profile), blast to standard one set of panels (~3 mil profile) and remediate to standard a set of under-blasted panels (from ~1 mil profile to ~ 3 mil profile).

Product Number: 51220-278-SG
Author: Carl Reed, Kat Coronado, Heather Cui
Publication Date: 2020
Industries: Test Method , Coatings
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$20.00
$20.00

Past work by the authors studied the effects of remediating over-blasted substrates by reblasting with smaller abrasive perpendicular to the substrate and at acute angles followed by coating the substrate, exposing the coated panels to B117 Salt Fog Testing and evaluating the coating performance, topography of the blast profile, scribe creep corrosion and cathodic delamination. In this study, the effect on coating corrosion resistance after remediating an under-blasted then remediated to standard preparation is undertaken. In this work, it is proposed to under-blast one set of panels (~1 mil profile), blast to standard one set of panels (~3 mil profile) and remediate to standard a set of under-blasted panels (from ~1 mil profile to ~ 3 mil profile). Two different blast media, steel grit and coal slag, are used to prepare the test panels. Uncoated panels are evaluated for differences in topography and embedment of blast media using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and stylus profilometry. Panels are coated with a commercial two package epoxy and exposed to ASTM B117, Salt Spray Testing for 1000 hours. After exposure, the panels are evaluated for scribe creep corrosion and cathodic delamination.

Past work by the authors studied the effects of remediating over-blasted substrates by reblasting with smaller abrasive perpendicular to the substrate and at acute angles followed by coating the substrate, exposing the coated panels to B117 Salt Fog Testing and evaluating the coating performance, topography of the blast profile, scribe creep corrosion and cathodic delamination. In this study, the effect on coating corrosion resistance after remediating an under-blasted then remediated to standard preparation is undertaken. In this work, it is proposed to under-blast one set of panels (~1 mil profile), blast to standard one set of panels (~3 mil profile) and remediate to standard a set of under-blasted panels (from ~1 mil profile to ~ 3 mil profile). Two different blast media, steel grit and coal slag, are used to prepare the test panels. Uncoated panels are evaluated for differences in topography and embedment of blast media using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and stylus profilometry. Panels are coated with a commercial two package epoxy and exposed to ASTM B117, Salt Spray Testing for 1000 hours. After exposure, the panels are evaluated for scribe creep corrosion and cathodic delamination.

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