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Corrosion protection of surfaces by nanocomposite and urethane top coatings
Asmatulu, R., Claus, R. O., Mecham, JB., & Corcoran, S. G. (2005). Corrosion protection of surfaces by nanocomposite and urethane top coatings. In WD. Armstrong (Ed.), Smart structures and materials 2005: Active materials: behavior and mechanics (pp. 40-51). SPIE-INT SOC OPTICAL ENGINEERING. https://doi.org/10.1117/12.601241
In the present study, nanosized silica particles (similar to 100 nm) were incorporated into epoxy polymers, and then sprayed on molybdenum treated Al coupons (2024-T3) by a nozzle spray unit at different thicknesses. A urethane top coating (1 mil) was also applied on some of the initially coated surfaces. The main purpose of the SiO2 and urethane was to absorb/block unwanted ions/molecules (i.e., Cl-, O, OH-, H2O, etc.) and increase the coating performance. Several corrosion tests including electrochemical impedance spectroscopy (EIS), salt spray and salt soaking were conducted on the prepared samples using a 0.5 M NaCl solution. The Al coupons coated with such nanocomposites and a urethane top coating showed excellent coating resistances (8x10(9) Omega-cm(2)) against corrosion attack. As a result, it is assumed that this novel coating system will allow coating industry to effectively protect the surface of materials.