A STUDY ON THE CHEMICAL MECHANISM FOR POWDER CORROSION OF BRONZE ALLOY

• 作 者: 范崇正 王昌燧 王胜君 张懋森 W. T. CHASE 韩自强
• 机 构: The University of Science and Technology of China, Hefei 230026, PRC,The University of Science and T
• 出 处: Science in China,Ser.B
• 发表日期: 1991年10期
• 关键词: bronze circles ancient thermodynamic giving pointed stored migrate chlorine spre

A Cu-Sn-Pb alloy modelled after an antique was cast and the powder-corrosion (P-C) was prepared on it under simulated natural conditions. The main components of the corrosion are much like those of the ancient bronze powder corrosion. It is found that chloride, water and oxygen are the essential factors for P-C formation of which chlorine plays the most important role. According to the results of expriments and thermodynamic calculations, the chemical mechanism of the copper desease was studied. It is pointed out that the fast spread of P-C is caused by two vicious circles.

A main Cu-Sn-Pb alloy modelled after an antique was cast and the powder-corrosion (PC) was prepared on it under simulated natural conditions. The main components of the corrosion are much like those of the ancient bronze powder corrosion. It is found that chloride, water and oxygen are the essential factors for PC formation of which chlorine plays the most important role. According to the results of expriments and thermodynamic calculations, the chemical mechanism of the copper desease was studied. It is pointed out that the fast spread of PC is caused by two vicious circles.