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La Chaux-de-Fonds, Switzerland

Degrigny C.,Haute Ecole de Conservation restauration Arc
Corrosion Engineering Science and Technology | Year: 2010

New protection systems for cultural heritage artefacts can be tested and their efficiency, compared to traditional systems, assessed using artificial metal coupons. The manufacturing of these coupons requires though a thorough investigation of the artefacts that they are supposed to simulate. Not only their composition, but their surface preparation (through artificial or natural aging) should copy as closely as possible real artefacts. Protection systems tested should be applied according to standardised protocols, while short term testing in humid chamber and long term testing on site should be monitored regularly to detect any possible failure. Only then the use of such artificial metal coupons will be validated. This approach is illustrated in this paper through the EU PROMET and Swiss POINT research projects. © 2010 Maney Publishing. Source


Degrigny C.,Haute Ecole de Conservation restauration Arc
Journal of Solid State Electrochemistry | Year: 2010

Electrochemical techniques like mechanical and chemical ones should be among the panoply of techniques conservators normally use when they conserve metal artefacts. Often though, they are discarded because they are considered as too complicated and dangerous. As a consequence, not much development in the use of these techniques in conservation was observed before the 1990s when their application to marine artefacts once again drew the attention of conservation professionals. More recently, the latter have recognised the importance of these techniques in the understanding of corrosion processes as well as their monitoring and in the solving of specific conservation issues. Furthermore, instruments that were previously only used by corrosion scientists are today entering the conservation field. Portable tools have even been designed so that treatments can be carried out in situ. The current trend is to cluster electrochemical and analytical techniques in parallel in order to fully understand the behaviour of metal artefacts when conserved. © 2009 Springer-Verlag. Source


Degrigny C.,Haute Ecole de Conservation restauration Arc | Guibert G.,Institute des Microtechnologies Appliquees IMA Arc | Ramseyer S.,Institute des Microtechnologies Appliquees IMA Arc | Rapp G.,Haute Ecole de Conservation restauration Arc | Tarchini A.,Haute Ecole de Conservation restauration Arc
Journal of Solid State Electrochemistry | Year: 2010

A new analytical tool for copper alloys based on the monitoring of E corr vs time is presented. This tool is particularly adapted to condition surveys carried out on-site by conservators on historic objects and was optimised so to respond to the needs of the conservation field such as the minimal impact on the artefacts, the portability of the instruments and its ease to use. A database constituted of 66 reference alloys representative of the materials found on technical artefacts with their electrochemical behaviour in three different solutions (Henniez mineral water, KNO 3 and sodium sesquicarbonate) was realised. The validation of the tool and the relevance of the database were assessed on two Swiss collections of technical, scientific and horology artefacts. © 2009 Springer-Verlag. Source

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