Mikić Dajana, Otmačić Ćurković Helena, Kosec Tadeja, Peko Neven
Research Laboratory for Corrosion Engineering and Surface Protection, Faculty of Chemical Engineering and Technology, University of Zagreb, HR 10000 Zagreb, Croatia.
Laboratory for Metals, Corrosion and Anticorrosion Protection, Slovenian National Building and Civil Engineering Institute, SI 1000 Ljubljana, Slovenia.
Materials (Basel). 2021 Apr 20;14(8):2063. doi: 10.3390/ma14082063.
Polluted urban environment enhances dissolution of patina and underlying bronze material of recent and historical bronze sculptures exposed outdoors. In this work, two bronze statues, situated in one of the most polluted Croatian cities, were examined in order to characterize composition of patina and its electrochemical stability. The composition of patina on several positions on each sculpture was determined by EDS, Raman spectroscopy, and FTIR measurements. Electrochemical impedance spectroscopy measurements were conducted in order to evaluate the corrosion stability of both patina and underlying bronze. Results obtained in this work show that the two examined bronze sculptures were covered with patina layer that was mainly composed of copper sulfides and sulphates, which is in accordance with the high concentrations of HS and SO in the atmosphere. However, the variations in the appearance of FTIR and Raman spectra revealed that the amount of each species differed from spot to spot, as well as the fact that other compounds, such as carbonates, were present at some areas. This difference in patina composition was reflected in electrochemical behavior as observed by electrochemical impedance spectroscopy.
受污染的城市环境会加速户外近期及历史青铜雕塑表面铜绿及其下方青铜材料的溶解。在本研究中，对位于克罗地亚污染最严重城市之一的两座青铜雕像进行了检测，以确定铜绿的成分及其电化学稳定性。通过能谱仪（EDS）、拉曼光谱和傅里叶变换红外光谱（FTIR）测量，确定了每座雕塑上几个位置的铜绿成分。进行电化学阻抗谱测量，以评估铜绿及其下方青铜的腐蚀稳定性。本研究结果表明，两座被检测的青铜雕塑表面覆盖着主要由硫化铜和硫酸盐组成的铜绿层，这与大气中高浓度的硫化氢（HS）和二氧化硫（SO）相符。然而，傅里叶变换红外光谱和拉曼光谱外观的变化表明，每种物质的含量因位置而异，并且在某些区域还存在其他化合物，如碳酸盐。正如电化学阻抗谱所观察到的，铜绿成分的这种差异反映在电化学行为上。
