Novel procedure for brochantite based pigment production and its immobilization for restoration of historical copper objects

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F20%3A43921641" target="_blank" >RIV/60461373:22310/20:43921641 - isvavai.cz</a>
Result on the web
<a href="https://www.mdpi.com/2079-6412/10/10/972" target="_blank" >https://www.mdpi.com/2079-6412/10/10/972</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/coatings10100972" target="_blank" >10.3390/coatings10100972</a>

Result language
angličtina
Original language name
Novel procedure for brochantite based pigment production and its immobilization for restoration of historical copper objects
Original language description
The article deals with the preparation of artificial copper pigment based on brochantite. The pigment was prepared by slow additions of sodium hydroxide solution into the solution of copper sulphate. The studied parameters were addition rate, solutions concentrations, ferrous ion addition, and filtration time. The prepared pigments were evaluated by means of X-ray diffraction and spectrophotometry. Subsequent pigment immobilization in an acrylate varnish was also studied. Observed parameters were influenced by solvent type, mechanical or chemical dispersion, and natural aging in an aggressive outdoor atmosphere. Pigment containing varnishes were evaluated by means of spectrophotometry, optical profilometers, and pull-off test. Slow hydroxide addition allows the formation of brochantite pigment. Fast filtration limits backward pigment decomposition. Ferrous ion improves pigment color closer to natural copper patina. The ideal immobilization procedure includes ethylacetate as a solvent and mechanical dispersion. The varnish filled with pigment provides sufficient adhesion to the metallic copper substrate as well as long-term color stability in the outdoor atmosphere. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/DG16P02H051" target="_blank" >DG16P02H051: Stable artificial patinas of copper alloys</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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