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Citation: Yao Shibing*, Zhang Zhiliang, Zhou Shaomin, Fang Jiangling. STUDY OF ANODIC FILM ON ALUMINIUM BY USING POSITRON ANNIHILATION LIFETIME SPECTROSCOPY[J]. Acta Physico-Chimica Sinica, ;1989, 5(04): 427-431. doi: 10.3866/PKU.WHXB19890410 shu

STUDY OF ANODIC FILM ON ALUMINIUM BY USING POSITRON ANNIHILATION LIFETIME SPECTROSCOPY

1.
Department of Chemistry; Institute of Physical Chemistry; Xiamen University; Department of Physics; Xiamen University

Received Date: 18 December 1987
Available Online: 15 August 1989

The anodic oxidation of annealed pure aluminium (99.99%) was carried out in 15% H_2SO_4 at different electrolytic conditions. The positron annihilation lifetime spectra of the anodized aluminium were measured and fitted into three lifetime components. The second component(τ_2, Ι_2) was assigned to the positron annihilation in the anodic film. It has been deduced that, from the Ι_2 curves, the film thirkness is propertional to the cell voltage and reaches a limit under constant cell voltage and temperature and that, form the τ_2 curves, the crystallinity of the anodic film increases with increasing cell voltage and anodizing time. The local crystallization in the anodic film would induce the void-like defects and hence result in the film less compact. An idea for improvement of mechanic properties of the anodic film on aluminium has been proposed.
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