电场作用下铅基阳极表面氧化膜残余内应力产生机理研究

doi:10.3724/SP.J.1077.2013.12734

无机材料学报 ›› 2013, Vol. 28 ›› Issue (9): 961-966.DOI: 10.3724/SP.J.1077.2013.12734 CSTR: 32189.14.SP.J.1077.2013.12734

电场作用下铅基阳极表面氧化膜残余内应力产生机理研究

李建中, 韦丽华, 王勃, 孙秀丽, 田彦文

(东北大学材料与冶金学院, 沈阳 110004)

收稿日期:2012-12-04 修回日期:2013-02-24 出版日期:2013-09-20 网络出版日期:2013-08-14
基金资助:
国家自然科学基金(51004028); 中央高校基本科研基金(N100402002)

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

LI Jian-Zhong, WEI Li-Hua, WANG Bo, SUN Xiu-Li, TIAN Yan-Wen

(School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China)

Received:2012-12-04 Revised:2013-02-24 Published:2013-09-20 Online:2013-08-14
Supported by:
National Natural Science Foundation of China (51004028); Special Fund for Basic Scientific Research of Central Colleges (N100402002)

摘要/Abstract

摘要： 采用SEM、XRD和Raman光谱法研究电场作用下含铬溶液中铅基阳极氧化膜的残余内应力行为、内应力形成, 讨论了氧化膜内应力产生过程与氧化膜表面形貌、物质结构转变的关系。结果表明, 在氧化膜形成初期, Cr₂O₇^2- 和HCrO₄^-离子首先吸附在铅基阳极表面, 电场作用下, 其与铅基体反应并分别形成PbCrO₄和PbO, 同时产生较大内应力。电流密度的增加, 显著提高氧化膜的内应力。随着氧化时间的延长, 阳极析氧行为的加剧, 促进PbO或β-PbO₂形成。同时, 晶粒长大与内应力的不匹配, 导致内应力局部释放, 表现出氧化膜残余内应力减小。铅基氧化膜中不同氧化物组织结构的晶格参数差异, 增加了氧化膜内应力梯度变化, 致使氧化膜破裂。

关键词: 电场, 铅合金, 阳极, 氧化膜, 残余内应力

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

中图分类号:

O646

李建中, 韦丽华, 王勃, 孙秀丽, 田彦文. 电场作用下铅基阳极表面氧化膜残余内应力产生机理研究[J]. 无机材料学报, 2013, 28(9): 961-966.

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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电场作用下铅基阳极表面氧化膜残余内应力产生机理研究

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

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