青铜器粉状锈生成机理研究

摸拟自然界条件,在仿古青铜合金表面进行人工腐蚀,得到与古青铜器粉状锈类似的化学物质.对粉状锈的生成条件进行分析,认为氯化物、水份及氧化气氛是基本要素,而氯离子的存在是关键. 本工作始终保持对试样的结构及成分进行监测,有利于揭示事物的真象. 本文以实验及热力学计算结果为依据,对粉状锈形成的化学机理进行了探讨,认为粉状锈的延展迅速是由于两个恶性化学循环的结果.     

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

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.