A STUDY ON KINETICS OF THE BRONZE POWDER-CORROSION DEVELOPMENT

HCl acid was applied to the surface of the self-prepared Cu-Sn-Pb allo y, and the methods of IR-REF, IR-PAS, XRD, SPM, SEM, TEM and pH were e mployed to study the forming process and the developing speed of the b ronze powder-corrosion Cu2(OH)3Cl (PC). It is found that the corrosion develops fast in acid environment at room temperature; ther corrosion Cu2(OH)3Cl with valence Cu2+ forms from alloy through the intermediat e corrosion CuCl with valence Cu+; PC is contagious, which can pollute the fresh bronze alloy from the corroded sample by air; when CuCl is oxidized to produce Cu2(OH)3Cl, Cu2+ cation forms at the same time, an d both the oxidizing reactions have zero-order reaction with respect t o O2 in the air; the PI formation reaction has first-order reaction wi th respect to Cull, in enormous distilled water Cu2(OH)3Cl forms from CuCl through the intermediate product Cu2O. All the results above are discussed in the present article, and the mechanism of PC formation is studied further. The reaction orders, the rate constants and the appa rent activity energies are calculated.