铜锡青铜合金腐蚀过程中的电化学与微结构特征研究

Electrochemical Properties and Microstructure of Cu-Sn Bronze Wares During Corrosion

采用电化学分析技术,如开路电位(OCP)、极化曲线(Tafel曲线)、电化学阻抗谱(EIS)等,并结合显微组织观察研究不同锡(Sn)含量的青铜合金在NaCl、Na_2SO_4溶液中的腐蚀过程。结果显示高Sn锡青铜具有更好的耐腐蚀性;对锡青铜合金中显微组织的观察发现α相的点蚀坑明显多于δ相,表明在电解质溶液中α相更易发生腐蚀。本研究为古代青铜器的锈蚀防护提供了基础数据,具有较重要的指导价值。

The corrosion process of different Cu-Sn bronzes in NaCl and Na_2SO_4 solutions were examined by electrochemical analysis technologies,including open circuit potential（ OCP）,polarization curves（ Tafel curves）,electrochemical impedance spectroscopy（ EIS）,etc. The microstructure were observed by a digital microscope for evaluating the preferential corroded phase（ α phase or δ phase）. Electrochemical experimental results revealed that the corrosion resistance of the bronze with high Sn content was superior to the bronze with low Sn content. Through microstructural observations,it was found that the corrosion pits on the α phase were significantly more than that on the δphase,indicating that the α phase was the preferential corroded phase. This study provides the basic data for the ancient bronze wares protection.