Novel Procedure for Brochantite Based Pigment Production and Its Immobilization for Restoration of Historical Copper Objects

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 filtr...

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Bibliographic Details
Published in:Coatings (Basel) 2020-10, Vol.10 (10), p.972
Main Authors: Rak, Pavol, Fink, Dominika, Bureš, Richard, Stoulil, Jan
Format: Article
Language:English
Subjects:
Aging (natural)
Aqueous solutions
Caustic soda
Color
Dispersion
Experiments
Ferrous ions
Filtration
Immobilization
Parameters
Patina
Pigments
Pollutants
Profilometers
Pull off tests
Sodium
Sodium hydroxide
Solvents
Spectrophotometry
Substrates
Varnishes
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Summary: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.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings10100972