Study on a corrosion behavior and new protection methods of corrosion for metal cultural properties

研究了金属文化性能的腐蚀行为及新的腐蚀防护方法。这些研究的要点如下。1)“Niiro”着色法，传统手工工艺：在Cu-Au合金或Cu-Zn合金表面形成含Au或Zn的Cu_2O薄膜。这些颜色是深紫色或黄绿色。这些膜不受Au浓度或Zn浓度的影响而免受腐蚀。2)“Iroage”法，传统手工工艺：通过“Iroage”技术在金银合金表面形成富金层。这一富金层保护基金属（金-银合金）免受腐蚀。3)硫化层形成技术：研究了用“Mutouhap”镀液制备的有色铜层的微观结构。铜片试样先用细小的刚玉颗粒抛光，然后用木炭抛光。样品在含有市场上家庭沐浴试剂“Mutouhap”的热水溶液中处理。用电子显微镜观察了有色层的微观结构。用分光光度计测量光谱反射率。4)其他：采用TEM、x射线衍射仪、edx法对古钱币（“Wadoukaichin”）表面腐蚀层进行分析。

The corrosion behavior and new protection methods of corrosion for metal cultural properties were studied. The points of these studies are as follows.1) "Niiro"-colored method, traditional handcraft technique : Cu_2O thin films containing Au or Zn are formed on the surface of Cu-Au alloys or Cu-Zn alloy. These colors are dark purple or yellowish green. These films are protected from the corrosion at independent on Au concentrations or Zn concentration.2) "Iroage" method, traditional handcraft technique : Au-rich layer is formed on the surface of Au-Ag alloys by the "Iroage" technique. This Au-rich layer is protected based metal (Au-Ag alloy) from the corrosion.3) Sulfide layer formation technique : Microstructures of colored layer of copper fabricated by using a bath-reagent "Mutouhap" have been investigated. Copper sheet specimens are polished with fine corundum particles and then with charcoal. The specimen are treated in a hot water solution containing the reagent "Mutouhap" on the market for family bath. The microstructures of the colored layer is observed by means of electron microscopy. The spectro reflectance is measured by spectrophotometer.4) Others : The corrosion layer on the surface of ancient coins ("Wadoukaichin") is analyzed by TEM, X-ray diffract meter and EDX-method.