Mechanism of Residual Stresses in Anodic Oxidized Film on Lead Substrate under Electric Field

doi:10.3724/SP.J.1077.2013.12734

Abstract

Abstract: Mechanism of residual stresses generated in anodic oxidized film on lead alloy substrate was investigated using CrO₃ solution with the influence of electric field. The stresses formation process, their relationship with surface morphology and structure of oxidation film were discussed in details based on the results of SEM, XRD and Raman tests. It is indicated that Cr₂O₇^2- and HCrO₄^- ions are absorbed on lead alloy surface in the initial formation process of oxidation film. Then PbCrO₄ is formed on the interface of Cr₂O₇^2- and Pb. HCrO₄^- oxidizes Pb into PbO under electric field. At the same time, the stresses are generated gradually in the oxide film and increase quickly with current density increase. However, enhanced oxygen evolution promotes the formation of PbO or β-PbO₂ with the increase oxidation time. Meanwhile, the growth of crystalline grain for lead oxides is believed to be mismatched with the developing inner stresses, releasing inner stresses, which lead to residual stresses decreasing in oxidation film. The film is cracked because stresses gradient increases remarkably in oxidized film due to the crystal lattice difference in different lead oxides.

Key words: electric field, lead alloy, anode, oxidation film, residual stresses

CLC Number:

O646

LI Jian-Zhong, WEI Li-Hua, WANG Bo, SUN Xiu-Li, TIAN Yan-Wen. Mechanism of Residual Stresses in Anodic Oxidized Film on Lead Substrate under Electric Field[J]. Journal of Inorganic Materials, 2013, 28(9): 961-966.

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