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Long‐Lasting Efficacy of Coatings for Bronze Artwork Conservation: The Key Role of Layered Double Hydroxide Nanocarriers in Protecting Corrosion Inhibitors from Photodegradation
Author(s) -
Salzano de Luna Martina,
Buonocore Giovanna G.,
Giuliani Chiara,
Messina Elena,
Di Carlo Gabriella,
Lavorgna Marino,
Ambrosio Luigi,
Ingo Gabriel M.
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201713234
Subject(s) - photodegradation , nanocarriers , corrosion , materials science , coating , hydroxide , kinetics , chemical engineering , corrosion inhibitor , metallurgy , chemistry , photocatalysis , inorganic chemistry , nanotechnology , organic chemistry , drug delivery , catalysis , physics , quantum mechanics , engineering
The photodegradation kinetics of 2‐mercaptobenzothiazole (MBT), a corrosion inhibitor for copper‐based alloys, is studied 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. The encapsulation of MBT into layered double hydroxide (LDH) nanocarriers slows down its decomposition kinetics by a factor of three. Besides preserving the corrosion inhibitor, such a strategy allows a controlled release of MBT triggered by corrosion‐related stimuli, for example, presence of chloride species and acid pH. The developed coating guarantees long‐lasting corrosion protection even at low amounts of inhibitor‐loaded LDH nanocarriers (ca. 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.