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Title: Selective dissolution in copper-tin alloys: Formation of corrosion- resistant patina on ancient Chinese bronze mirrors

Abstract

Many ancient Chinese bronze mirrors have survived with a patina that leaves the delicate relief surface decorations intact. The microstructure of these ancient mirrors is two-phase and consists of acicular {alpha}-phase (Cu-rich) regions encased in a {delta}-phase (Sn-rich) matrix. At the surface, there is evidence of selective dissolution of the ct phase; the cc-phase regions are replaced pseudomorphically by a mineral product with the {delta} phase remaining metallic. Electrochemical polarization has been used to drive the copper dealloying process in modem, cast bronze. Synchrotron x-ray diffraction was employed to compare the ancient samples with those that were prepared potentiostatically. Poorly crystallized tin oxide (SnO{sub 2}) was found in the {alpha} replacement products of both sample types. The corrosion-resistance of the potentiostatically-treated bronze samples was tested by atmospheric exposure. Comparison with exposed, untreated samples indicated that the treatment was protective.

Authors:
 [1];  [2];  [3];  [4]
  1. State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering|[Brookhaven National Lab., Upton, NY (United States)
  2. Brookhaven National Lab., Upton, NY (United States)
  3. State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering
  4. Smithsonian Institution, Washington, D.C. (United States) Freer Gallery of Art, Dept. of Conservation and Scientific Research
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
274187
Report Number(s):
BNL-63182; CONF-960401-60
ON: DE96012553
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Conference
Resource Relation:
Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: [1996]
Country of Publication:
United States
Language:
English
Subject:
05 NUCLEAR FUELS; 36 MATERIALS SCIENCE; BRONZE; PROTECTIVE COATINGS; CORROSION RESISTANCE; X-RAY DIFFRACTION; AGING; CONTAINERS; UNDERGROUND DISPOSAL

Citation Formats

Taube, M., Davenport, A.J., King, A.H., and Chase, T. III. Selective dissolution in copper-tin alloys: Formation of corrosion- resistant patina on ancient Chinese bronze mirrors. United States: N. p., 1996. Web.
Taube, M., Davenport, A.J., King, A.H., & Chase, T. III. Selective dissolution in copper-tin alloys: Formation of corrosion- resistant patina on ancient Chinese bronze mirrors. United States.
Taube, M., Davenport, A.J., King, A.H., and Chase, T. III. Mon . "Selective dissolution in copper-tin alloys: Formation of corrosion- resistant patina on ancient Chinese bronze mirrors". United States. doi:. https://www.osti.gov/servlets/purl/274187.
@article{osti_274187,
title = {Selective dissolution in copper-tin alloys: Formation of corrosion- resistant patina on ancient Chinese bronze mirrors},
author = {Taube, M. and Davenport, A.J. and King, A.H. and Chase, T. III},
abstractNote = {Many ancient Chinese bronze mirrors have survived with a patina that leaves the delicate relief surface decorations intact. The microstructure of these ancient mirrors is two-phase and consists of acicular {alpha}-phase (Cu-rich) regions encased in a {delta}-phase (Sn-rich) matrix. At the surface, there is evidence of selective dissolution of the ct phase; the cc-phase regions are replaced pseudomorphically by a mineral product with the {delta} phase remaining metallic. Electrochemical polarization has been used to drive the copper dealloying process in modem, cast bronze. Synchrotron x-ray diffraction was employed to compare the ancient samples with those that were prepared potentiostatically. Poorly crystallized tin oxide (SnO{sub 2}) was found in the {alpha} replacement products of both sample types. The corrosion-resistance of the potentiostatically-treated bronze samples was tested by atmospheric exposure. Comparison with exposed, untreated samples indicated that the treatment was protective.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1996},
month = {Mon Jul 01 00:00:00 EDT 1996}
}

Conference:
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