“…The pull-off adhesion method (Figure 3 and Figure 9) provides the force needed to pull away the coating from the substrate via a test dolly adhered to the coated surface by black epoxy adhesives (A1, DP 420, 3M, USA). The dolly and coating surface were sanded with 400-grade emery before the application of epoxy glue because the glue must wet both surfaces leading to an increase in the mechanical interlocking ability [10, 18]. Figure 9 (a) Post-pull-off adhesion testing image of the coated composite surface and (b) dolly surface (c) SEM of dolly surface revealing glue followed by PU top coat and epoxy primer.…”
Section: Resultsmentioning
confidence: 99%
“…For surface wettability and improving adhesion and bond strength, various surface treatment techniques have been addressed in recent years [6][7][8][9][10][11]. Adhesion properties (cross-cut, pull-off adhesion and peel strength), corrosion resistance, water immersion studies, tribological performance (taber abrasion and pin-on-disc), tensile properties, DSC, FTIR and TGA studies, WCA were investigated and reported by a few authors [12][13][14][15][16][17][18][19][20][21][22].…”
In the present study, glass-epoxy composites were used as a substrate to study the performance of modified polyurethane coating. Two-layer coating (180-200 µm) wherein the epoxy primer as the first coat and polyurethane as the top coat was applied using an air-assisted spray gun to increase the service life of the composite. The analysis of coating was performed using gloss, contact angle, FTIR, TGA, tensile test and SEM. The bonding strength between coating and substrate was evaluated by cross-hatch cut, 180 deg peel strength and pull-off adhesion tests. Scratch, Taber abrasion and Pin-on-disc tests were also performed to evaluate the wear resistance. In addition, a rain erosion test was performed to check the stability of the coating. From the above tests, it is concluded that the applied coating well adhered to the composite substrate. The data generated from different tests can be used to estimate the service life of polymer composites and coatings.
“…The pull-off adhesion method (Figure 3 and Figure 9) provides the force needed to pull away the coating from the substrate via a test dolly adhered to the coated surface by black epoxy adhesives (A1, DP 420, 3M, USA). The dolly and coating surface were sanded with 400-grade emery before the application of epoxy glue because the glue must wet both surfaces leading to an increase in the mechanical interlocking ability [10, 18]. Figure 9 (a) Post-pull-off adhesion testing image of the coated composite surface and (b) dolly surface (c) SEM of dolly surface revealing glue followed by PU top coat and epoxy primer.…”
Section: Resultsmentioning
confidence: 99%
“…For surface wettability and improving adhesion and bond strength, various surface treatment techniques have been addressed in recent years [6][7][8][9][10][11]. Adhesion properties (cross-cut, pull-off adhesion and peel strength), corrosion resistance, water immersion studies, tribological performance (taber abrasion and pin-on-disc), tensile properties, DSC, FTIR and TGA studies, WCA were investigated and reported by a few authors [12][13][14][15][16][17][18][19][20][21][22].…”
In the present study, glass-epoxy composites were used as a substrate to study the performance of modified polyurethane coating. Two-layer coating (180-200 µm) wherein the epoxy primer as the first coat and polyurethane as the top coat was applied using an air-assisted spray gun to increase the service life of the composite. The analysis of coating was performed using gloss, contact angle, FTIR, TGA, tensile test and SEM. The bonding strength between coating and substrate was evaluated by cross-hatch cut, 180 deg peel strength and pull-off adhesion tests. Scratch, Taber abrasion and Pin-on-disc tests were also performed to evaluate the wear resistance. In addition, a rain erosion test was performed to check the stability of the coating. From the above tests, it is concluded that the applied coating well adhered to the composite substrate. The data generated from different tests can be used to estimate the service life of polymer composites and coatings.
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