Reversible protective and consolidating coatings for the ancient iron joints at the Acropolis monuments

A study on the Acropolis monuments reveals that Paraloid B67 enhanced with 2% nano-alumina provides superior corrosion protection for ancient iron joints, while Poligen CE12 may locally accelerate corrosion reactions. Researchers from the National Technical University of Athens and the Acropolis Restoration Service tested seven coating systems in both laboratory and field conditions over one year. The study found that Paraloid B67 with nano-alumina offered more uniform application on corroded surfaces and better performance in retarding corrosion development, though it could not prevent all local corrosion events. Raman spectroscopy and orthophotographic documentation were used to assess coating reversibility and surface alterations.

Frantzi, G., Delagrammatikas, M., Papadopoulou, O., Titakis, C., Aggelakopoulou, E., & Vassiliou, P. (2022). Reversible protective and consolidating coatings for the ancient iron joints at the Acropolis monuments. Acta IMEKO, 11(4), 1–13. https://doi.org/10.21014/actaimeko.v11i4.1341