THE STUDY ON MORPHOLOGY AND GROWTHMECHANISM OF PITS ON ANODIZED ALUMINUM

J Chin Soc Corr Pro

2003, Vol. 23

Issue (4): 198-201 DOI:

Research Report

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THE STUDY ON MORPHOLOGY AND GROWTHMECHANISM OF PITS ON ANODIZED ALUMINUM

Jianjun Ren;Yu Zuo

北京化工大学材料科学与工程学院

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Jianjun Ren; Yu Zuo. THE STUDY ON MORPHOLOGY AND GROWTHMECHANISM OF PITS ON ANODIZED ALUMINUM. J Chin Soc Corr Pro, 2003, 23(4): 198-201 .

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Abstract Pitting behavior of anodized aluminum in NaCl solut ion was studied using methods of potentiodynamic polarization and SEM.The result s show that the controlling mechanism for pitting changes with development of th e pit.The early stage and last stage of pit growth are controlled by diffusion,w hile the middle stage is controlled by ohmic action.Once a pit penetrates the an odic film,it preferentially propagates in the aluminum matrix,and hemispherical pit with a film cover above is formed.Only a small pit is present on the film co ver as the diffusion channel for pit development.The growth mechanism of pitting was discussed.

Key words: anodic aluminium film pitting growing mechanism

Received: 08 January 2002

ZTFLH:

TG174.451

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I4/198

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