Date of Original Version
Organic paints are applied to galvanized or metalized steel surfaces in a duplex system, which is potentially more sustainable than the zinc-rich primer/steel system. A series of experimental tests were performed to measure and investigate adhesion strengths on three different types of roughened zinc surfaces. The contact angles were also measured for freshly formulated liquid paints on the roughened zinc surfaces to test if there is a correlation between the paint wetting property and the adhesive strengths. By comparing duplex system and zinc-rich primer/steel qualified North East Protective Coating (NEPCOAT) panels, it was found that the paint adhesion of the duplex system is as strong as the zinc primer/steel panels test results. The results also showed that adhesive strengths depend on the match between the paint and type of roughened zinc surfaces. The measurement of liquid paint wetting properties indicates small contact angles correlate with stronger pull-off adhesive strength. The authors of this study suggest that contact angle/strength correlation could be useful as a tool for optimizing the match between the paints and the profiled zinc surface.
Yang, S., Lee, K. W., Lu, C., Mirville, M., & Parham, A. (2017). Adhesion Evaluation of Duplex Paint System for Sustainable Infrastructure. Journal of Materials in Civil Engineering, 29(9), 04017134. doi: 10.1061/(ASCE)MT.1943-5533.0001909
Available at: http://dx.doi.org/10.1061/(ASCE)MT.1943-5533.0001909