Long-Lasting Efficacy of Coatings for Bronze Artworks Conservation: the Key Role of Layered Double Hydroxide Nanocarriers in Protecting Corrosion Inhibitors from Photodegradation.

Long-Lasting Efficacy of Coatings for Bronze Artworks Conservation: the Key Role of Layered Double Hydroxide Nanocarriers in Protecting Corrosion Inhibitors from Photodegradation. Angew Chem Int Ed Engl. 2018 Apr 17;: Authors: Salzano de Luna M, Buonocore GG, Giuliani C, Messina E, Di Carlo G, Lavorgna M, Ambrosio L, Ingo GM Abstract The photodegradation kinetics of 2-mercaptobenzothiazole (MBT), a corrosion inhibitor for copper-based alloys, is studied for the first time in high amorphous polyvinyl alcohol coatings subjected to either UV irradiation or indoor light exposure. The photodegradation process proceeds rapidly, thus compromising the anticorrosion ability of the coating. We prove that the encapsulation of MBT into layered double hydroxide (LDH) nanocarriers slows down its decomposition kinetics by a factor 3. Besides preserving the corrosion inhibitor, such a strategy allows a controlled release of MBT triggered by corrosion-related stimuli, e.g. presence of chloride species and acid pH. The developed coating guarantees long-lasting corrosion protection even at low amounts of inhibitor-loaded LDH nanocarriers (~5 wt%). This also reflects in a high transparency, which makes the protective coating suitable for demanding applications, such as the conservation of high-value metal works of art. PMID: 29663606 [PubMed - as supplied by publisher]
Source: Angewandte Chemie - Category: Chemistry Authors: Tags: Angew Chem Int Ed Engl Source Type: research