重庆地区一明代大型铜镜的锈蚀分析与保护

CORROSION AND CONSERVATION OF A BIG BRONZE MIRROR IN MING DYNASTY

采用扫描电镜(SEM)和X射线衍射(XRD)两种分析手段,对一明代大型铜"业镜"酥粉锈进行了分析测试。测试结果表明酥粉锈的主要成分为块铜矾,这是重庆地区酸性大气环境中有害气体SO2侵蚀的产物。常见的孔雀石、蓝铜矿、氯铜矿等锈蚀产物在酥粉锈中未有发现,因此推测重庆地区铜器(非出土)主要受SO2的影响,据此采取了相应的保护措施。

Scanning electron microscopy(SEM) and X-ray diffraction(XRD) were employed to analyze the composition and structure of the powdery patina of a big Ming Dynasty bronze mirror.The composition of the patina was mainly Cu3(SO4)(OH)4,which was the matter corroded by SO2 in polluted air.But the common patina such as CuCO3·Cu(OH)2,2CuCO3·Cu(OH)2 and Cu2(OH)3Cl were not found.These indicated that SO2 affected seriously bronze wares in the Chongqing area.Some appropriate conservation measures were suggested.