氯化亚铜氧化反应的化学动力学初探

A PRELIMINARY APPROACH TO THE CHEMICAL KINETICS OF CuCl OXIDIZATION

多数被发掘的古代青铜文物表面都附着有某些钢锈,其中以粉状锈(Cu_2(OH)_3Cl)对铜器的腐蚀最为严重.迄今已有一些文献介绍粉状锈的生成机理,但对其反应过程的动力学研究尚未见报导。作为青铜合金中含量最丰的元素铜,被氧化腐蚀是分步进行的.本工作主要用X-光衍射及分光光度法对一价铜锈CuCl在潮湿环境中进行氧化反应的速度常数及表观活化能进行测定核算;对反应的中间产物及伴随现象进行分析探讨。

XRD and SPM techniques were used to identify the products and reaction ratesfor CuCl oxidization. The results showed tbe reaction between CuCl,O_2 and H_2O israpid at ambient conditions. The bronze powder-corrosion with Cu (Ⅱ) formedthrough the corrosion with Cu(Ⅰ)such as(CuCl),as soon as the Cu_2(OH)_3Cl once for-med, Cu(Ⅱ) ion occured in the mean while; the fresh corrosion products dispersedin solution as colloidal dispersions, and CuCl transformed into Cu_2(OH)_3Cl throughCu_2O. The experimental phenomena were discussed. Tbe reaction order, reaction rate,and apparent activation energy of these reactions were calculated.