A Study on Kinetics of the Bronze Powder-Corrosion Development

HCl acid was applied to the surface of the self-prepared Cu-Sn-Pb alloy, and the methods of IR-REF, IR-PAS, XRD, SPM, SEM, TEM and pH were employed to study the forming process and the developing speed of the bronze powder-corrosion Cu_2(OH)_3Cl (PC). It is found that the corrosion develops fast in acid environment at room temperature; the corrosion Cu_2(OH)_3Cl with valence Cu^(2+) forms from alloy through the intermediate 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 Cu_2(OH)_3Cl, Cu^(2+) cation forms at the same time, and both the oxidizing reactions have zero-order reaction with respect to O_2 in the air; the P1 formation reaction has first-order reaction with respect to Cull; in enormous distilled water Cu_2(OH)_3Cl forms from CuCl through the intermediate product Cu_2O.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 apparent activity energies are calculated.

HCl acid was applied to the surface of the self-prepared Cu-Sn-Pb alloy, and the methods of IR-REF, IR-PAS, XRD, SPM, SEM, TEM and pH were employed to study the forming process and the developing speed of the bronze powder-corrosion Cu2（OH）3Cl （PC）. It is found that the corrosion develops fast in acid environment at room temperature; the corrosion Cu2（OH）3Cl with valence Cu2+ forms from alloy through the intermediate 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, and both the oxidizing reactions have zero-order reaction with respect to O2 in the air; the P1 formation reaction has first-order reaction with 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