青铜粉状锈生长过程的跟踪观测

A follow-observation on the developping process of the powder corrosion

在自制Cu－Sn－Pb合金表面施加腐蚀液，分别采用扫描电镜，透射电镜，红外反射光谱，红外光声光谱和显微光密度放大等仪器分析技术，跟踪观察粉状锈的生长发展过程。发现：锈蚀首先从表面棱角处发生；Cu首先生成一价锈CuCl，然后继续氧化生成二价锈Cu2（OH）3Cl；初期形成的粉状锈颗粒度极细，仅为纳米量级；常温下生锈速度十分迅速，因此粉状锈对青铜器的破坏性极大。文章对所观测到的现象进行了讨论，对锈体粒子大小及生长速度作了半定量分析。

On the surface of self - made bronze alloy (Cu - Sn - Pb) corroding solution was applied;methods of SEM, TEM, IR - RFF, IR - PAS and PDS were emploied to detect the formation and developping process of bronze powder corrosion (BPC), the main composition of which is Cu2 (OH)3Cl (Atacamite). It is found that the corrosion is formed on the edges and corners preferen-tially; Cu forms CuCl first and then become Cu2(OH)3Cl; during the initial stage the powder of BPC is very fine and in the nm - dimension; and that at room temperature the developping speed of BPC is very fast and destroys the bronze seriously.In the present paper, those phenomena above are discussed; the size of BPC and the develop-ping speed are treated serni - quantitatively.