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Citation: Yan Kangping, Shen Xingsu. ON A.C.ETCHING OF ALUMINUM FOIL IN HYDROCHLORIC ACID Ⅲ.THE EFFECT OF FREQUENCY[J]. Chinese Journal of Applied Chemistry, ;1987, 4(1): 57-61. shu

ON A.C.ETCHING OF ALUMINUM FOIL IN HYDROCHLORIC ACID Ⅲ.THE EFFECT OF FREQUENCY

Yan Kangping ¹ ,
Shen Xingsu ^2,,

1.
1. Department of Chemical Engineering, Chengdu University of Science and Technology, Chengdu;
2.
2. Changchun Institute of Applied Chemistry, Academia Sinica

Corresponding author: Shen Xingsu,
Received Date: 14 February 1986
Available Online: 31 March 1986

The effect of frequency from 10 to 100Hz on A. C. etching of aluminum foil in hydrochloric acid has been investigated. It was found that there exists an optimum frequency f_m corresponding to the relatively highest surface area magnification under certain etch condition. f_m was also temperature dependent, it moves toward higher value with increase of temperature.The preferable frequency and temperature were 20Hz and 35℃ respectively. Based on the breakdown potential obtained from the oscillogram, the weight and the morphology of etch film, it may be concluded that with the frequency below f_m the etch film formed was thin and it was easy to be broken through to produce a higher density of pits, which would be merged with each other ultimately, leading to a loose morphology; with the frequency higher than f_m the etch film was too thick to be broken through, the etch morphology exhibited only a few large pits. Only at f_m the thickness of the etch film was suitable to produce a moderate density of pits, and at last a deep layer of roughened metal was formed, giving the maximum surface area magnification.The importance of the initial aluminum surface condition in A.C. etching was also discussed.
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