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THE EFFECTS OF CORROSION AND CONSERVATION TREATMENTS ON NON-DESTRUCTIVE NEUTRON DIFFRACTION ANALYSIS OF ARCHAEOLOGICAL COPPER ALLOYS: PRELIMINARY RESULTS*

Authors

  • L. D. FRAME,

    Corresponding author
    1. School of History, Archaeology and Religion, Cardiff University, Humanities Building, Colum Drive, Cardiff CF10 3EU, UK
      email lesleydf@alum.mit.edu
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  • I. C. FREESTONE,

    1. University College London, Institute of Archaeology, 31-34 Gordon Square, London WC1B 3DG, UK
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  • SHU YAN ZHANG,

    1. ISIS Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, UK
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  • M. NICHOLAS

    1. School of History, Archaeology and Religion, Cardiff University, Humanities Building, Colum Drive, Cardiff CF10 3EU, UK
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email lesleydf@alum.mit.edu

Abstract

Analysis of residual stress in archaeological copper alloy artefacts by neutron diffraction has considerable potential for the investigation of early fabrication processes. However, residual stresses in metals are known to relax due to conditions similar to those encountered during burial, corrosion and conservation. In this pilot study, we investigate the effects of corrosion and conservation on a small group of replica copper ingots. Although corrosion and light cleaning do indeed cause some relaxation of stresses in the metal, corrosion having the most significant effect, the basic patterns and major features of the stress profiles may still be seen.

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