Apport des traitements carboxylates à la protection des alliages cuivreux

Abstract : In outdoor environment copper and copper alloys objects undergo degradations that lead to physical and aesthetic modifications of the artwork. To limit these changes interactions between the corrosion layer and its exposure environment should be reduced by applying protective treatment. This project proposes to study two types of protective treatments: microcrystalline wax (Cosmolloïd wax) and decanoate solutions (NaC10 and HC10). For this study, naturally corroded copper "model" samples were used to develop an analytical methodology to study the action and penetration of the two types of protective treatment applied to corrosion layers. This methodology allowed to observe that although the surface action changes according to the nature of the treatment, the penetration seems to depend essentially on its application. Re-corrosion experiments of treated samples was also carried out under immersion conditions and atmospheric corrosion with relative humidity cycling, both using isotopic tracers (D2O and 18O) in order to qualitatively evaluate and compare the effectiveness of the protective treatments. Degradations under UVB and leaching off treatments also lead to a study of their behavior under conditions of external exposure. The detection of isotopic tracers in the corrosion layers by ToF-SIMS and NRA analysis showed equivalent efficiencies for both treatments. They also revealed differences of holding faced with different factors. While microcrystalline wax degrades rapidly under UVB radiation compared to HC10 treatment, the leaching phenomenon seems to degrade more rapidly a treatment remaining on the surface of the corrosion layer.
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Submitted on : Friday, July 27, 2018 - 10:42:12 AM
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Emilande Apchain. Apport des traitements carboxylates à la protection des alliages cuivreux. Matériaux. Université de Cergy Pontoise (UCP), 2018. Français. ⟨tel-01850272⟩

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