Materials Performance

NOV 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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51 NACE INTERNATIONAL: VOL. 56, NO. 11 MATERIALS PERFORMANCE NOVEMBER 2017 Continued f rom page 49 incremental rust formation, which indi- cated zinc corrosion activity and some level of beneficial cathodic polarization. Even though rust was observed at defect sites, the authors note that the extent of corro- sion probably would have been greater if zinc pigment was not present in the primer matrix near the defect sites. ey conclude that the benefits of including nanoparticles in zinc-rich primer coated steel could not be easily ascertained in the chloride solution immersion tests; however, they suggest that some level of enhanced conductivity was present in the NPE-ZRP coated samples since steel corro- sion was generally limited at the defect sites even though anodic currents were high and consumption of zinc pigments adjacent to the defects was evident. e authors sug- gest further testing to determine the role of the nanoparticles in the polarization behav- ior of the steel, and to assess the influence of nanoparticles on the galvanic coupling of dispersed zinc pigments and the long-term durability of NPE-ZRP.

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