Stabilisation of archaeological copper alloy artefacts using subcritical fluid technology
The research presented aimed to investigate potential of subcritical fluid technology to effect Cl- release and transform compounds of copper alloy artefacts of cultural significance. The work intended to determine the most effective pH, temperature, and time combination subcritical treatment variables to: 1. transform or solvate insoluble or sparingly soluble copper compounds containing Cl - CuCl and Cu2(OH)3Cl (atacamite and clinoatacamite); 2. examine impact on typical patina compounds Cu2O and âCu2CO3(OH)2 and to establish optimal conditions for their retention throughout treatment. Additionally, the research expected to offer guidance on the values of the operational parameters to use when applying subcritical treatment to archaeological copper alloy objects. The series of experiments yielded preliminary results on solvation, extraction, chemical transformation, and physical modification of the predominant corrosion products found on copper alloy artefacts. Experiments were completed using analogue pressed pellets of corrosion products, naturally corroded copper coupons and archaeological artefacts, with specific focus on corrosion profiles, metallography and microstructure. The results of extraction
Nasanen, Liisa Maria Elina
AM Museums (General). Collectors and collecting (General) ; C Auxiliary sciences of history (General) ; CC Archaeology ; Q Science (General) ; QD Chemistry ; TA Engineering (General). Civil engineering (General)
Stabilisation of archaeological copper alloy artefacts using subcritical fluid technology. The research presented aimed to investigate potential of subcritical fluid technology to effect Cl- release and transform compounds of copper alloy artefacts of cultural significance. The work intended to determine the most effective pH, temperature, and time combination subcritical treatment variables to: 1. transform or solvate insoluble or sparingly soluble copper compounds containing Cl - CuCl and Cu2(OH)3Cl (atacamite and clinoatacamite); 2. examine impact on typical patina compounds Cu2O and âCu2CO3(OH)2 and to establish optimal conditions for their retention throughout treatment. Additionally, the research expected to offer guidance on the values of the operational parameters to use when applying subcritical treatment to archaeological copper alloy objects. The series of experiments yielded preliminary results on solvation, extraction, chemical transformation, and physical modification of the predominant corrosion products found on copper alloy artefacts. Experiments were completed using analogue pressed pellets of corrosion products, naturally corroded copper coupons and archaeological artefacts, with specific focus on corrosion profiles, metallography and microstructure. The results of extraction
stabilisation archaeological copper alloy artefacts use fluid technology present investigate_potential fluid technology effect release transform compound copper_alloy artefacts cultural_significance work intend determine effective temperature time combination treatment variable transform soluble copper compound contain examine_impact typical compound establish optimal condition retention throughout treatment additionally expect offer guidance value operational parameter use apply treatment archaeological copper alloy object series yield preliminary extraction chemical transformation physical modification predominant corrosion_product find copper_alloy artefact complete use analogue press corrosion_product naturally copper archaeological_artefact specific_focus corrosion profile metallography microstructure extraction