PRESERVATION OF COPPER ALLOYS BY MEANS OF BTA DOPED VARNISHES AND WAXES AND THEIR OXYGEN PERMEABILITY

1 MSALLAMOVA Sarka
Co-authors:
1 NAGYOVA Dominika 2 WITOSZKOVA Petra 1 KOHOUTKOVA Martina 1 JAMOBOROVA Tereza
Institutions:
1 University of Chemistry and Technology, Prague, The Czech Republic, EU, msallams@vscht.cz
2 Central Bohemia Museum in Roztoky u Prahy, The Czech Republic, EU, petra.witoszkova@email.cz
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1188-1193
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
28 views / 1 download
Abstract

The set of five bronze vessels from the Late Bronze Age was found near to the Lidice village in 2014. The copper (I) chloride - nantokite was identified in a mixture of corrosion products. Nantokite is exposed to the surrounding atmosphere after excavation of the bronze vessels from a soil. Nantokite reacts with moisture and oxygen in the air to form basic copper chlorides. Basic copper chlorides have a larger volume than nantokite. The volume change of corrosion products leads to disintegration of metal core along the grain boundaries. Such a type of bronze corrosion damage is called bronze disease. The aim of the study was to suggest preservation coating system with the lowest oxygen permeability. The acrylic based lacquers (Paraloid B72 and Paraloid B48N), waxes (beeswax and microcrystalline wax) and corrosion inhibitor 1,2,3-Benzotriazole (BTA) were tested. Efficiency of monolayer and double layer preservation systems was compared. The double layer preservation system has performed the lowest oxygen permeability compared with the other tested substances. The inner layer is formed of the acrylic lacquer Paraloid B48N with addition of BTA and an outer layer is made of the microcrystalline wax with BTA addition.

Keywords: Copper alloys, preservation, lacquer, wax, oxygen permeability
Scroll to Top