duminică, 6 ianuarie 2013
ASSESSING INDOOR LEAD CORROSION USING RAMAN SPECTROSCOPY SCIENTIFIC PAPER DURING ELECTROCHEMICAL REDUCTION
key words:Lead corrosion, Raman spectroscopy,oxide reduction, organic acids, electrochemistry
Assesing indoor lead corrosion using Raman spectroscopy (2008)
ASSESSING INDOOR LEAD CORROSION USING RAMAN SPECTROSCOPY SCIENTIFIC PAPER DURING ELECTROCHEMICAL REDUCTION
key words:Lead corrosion, Raman spectroscopy,oxide reduction, organic acids, electrochemistry
Dating Archeological Lead Artifacts from Measurement of theCorrosion Content Using the Voltammetry of Microparticles
Dating Archeological Lead Artifacts from Measurement of theCorrosion Content Using the Voltammetry of Microparticles
Treatments of Corroded Lead Artefacts (2006)
Treatments of Corroded Lead Artefacts (2006)
Title : Treatments of Corroded Lead Artefacts AN OVERVIEW
Authors: Bart Schotte and Annemie Adriaens
Reference: S T U D I E S I N C O N S E RVAT I O N 5 1 ( 2 0 0 6 ) PAG E S 1 – 8
Abstract : In the past, corroded lead objects have been treated in many different ways. Some treatment methods are based on cleaning the surface, and rely on the dissolution of the stable corrosion layer. Other methods involve the conversion of the corrosion products into metallic lead, and have been used to preserve the design, which is still present in the corrosion layer and which contains information of the original surface. Such techniques work particularly well on lead objects that have been exposed in a humid environment containing organic acid vapours, where an active corrosion crust is likely to develop. The volume of the corrosion products in an active corrosion crust is greater than that of the original metal, resulting in cracking over time, thereby increasing the access of pollutants to the metal below. This overview describes the different treatment methods applied to lead objects; it is not intended to provide practical guidelines with regard to the conservation of lead objects.
Link:Treatments of Corroded Lead Artefacts AN OVERVIEW
Link:A study of the electrolytic reduction of corroded lead objects and the application, characterization and testing of a protective lead carboxylate coating
Keywords: corrosion, lead, metals, plumb, coroziune plumb,metale,lead artefacts,artefacte plumb, coroziune
PIXE-PIGE for ancient glass corrosion measurements (2002)
Use of PIXE-PIGE under variable incident angle for ancient glass corrosion measurements
Title : Use of PIXE-PIGE under variable incident angle for ancient glass corrosion measurements
Authors: G.Weber,D. Strivay,L.Matinot and H.P.Garnir
Reference: Nuclear Instruments and Methods in Physics Research B189,2002,pp.350-357
Abstract : Although glass is usually considered as a very stable archaeological material, it can undergo severe degradation.Soda-lime glass, the most common glass throughout ancient times, is particularly sensitive to this problem. The glass surface absorbs moisture from its environment and the contact with CO2 causes Na2O and NaOH to convert to Na2CO3, which is extremely hygroscopic. The subsequent unstable glass layer can be leached out and causes decomposition of the glass. The non-destructive PIGE–PIXE method of investigation allows detection of this phenomenon even if no visible effect appears. The variable incident angle method is able to discern the depth of the degradation. One aim of such studies is the possible dating or at least fake detecting of archaeological materials. Furthermore, even objects of large size can be investigated with the atmospheric PIGE–PIXE set-up. Some examples of measurements on ancient glass are given.
Link: http://www.ipnas.ulg.ac.be/garnir/publications/2002PIXEglassNIM.pdf
Keywords: PIXE,Archaeometry, Corrosion, Glass artifacts,arheometrie,coroziune,artefacte sticla ,coroziune sticla,sticla,caracterizare, metode analiza