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| Chemical behavior of mass transfer at the bronze/environment interface |
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| 王菊琳北京化工大学 100029 |
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Cite this article:
. Chemical behavior of mass transfer at the bronze/environment interface. Chin J Mater Res, 2004, 18(3): 246-250.
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Abstract A simulated occluded cell (O.C.) was used on the study
of chemical changes in the local corrosion pits or crevices of
archaeological bronze in simulated environment medium
(0.028 mol$\cdot$L$^{-1}$ NaCl + 0.01 mol$\cdot$L$^{-1}$
Na$_{2}$SO$_{4}$ + 0.016 mol$\cdot$L$^{-1}$ NaHCO$_{3}$). It is
found that the pH value decreases from 7.00 to 5.02 as anodic
current passes the cell for 32 hours, meanwhile Cl$^{-}$ and SO$^{2-}_{4}$
migrate into the O.C. and their concentrate rate reachs 6.31 and
2.93, respectively. The metallic ion concentrations of Cu, Sn, and
Pb in the O.C. and bulk solution were measured which were used to
calculate the dissolution factors, $f_{\rm Sn/Cu}$ and $f_{\rm Pb/Cu}$.
The results of $f_{\rm Sn/Cu}<$1 and $f_{\rm Pb/Cu}>$1 indicate that the
selective dissolution order and corrosion rates are Pb$>$Cu$>$Sn. The
composition of corrosion products was analyzed and how the products are
layered on bronze surface is explained. The corrosion products from inner
to outer are CuCl, CuCl and Cu$_{2}$O, cupric compounds respectively.
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Received: 19 July 2004
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