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| EFFECT OF CATHODIC HALF CYCLES IN A.C. ETCHING ON PITTING BEHAVIOR OF ALUMINUM IN HYDROCHLORIC ACID SOLUTION |
| Zhanwen Xiao; |
| 电子科技大学电子材料工程系 |
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Abstract The effects of cathodic potential limits and cathodic period on voltammetric characteristics and surface morphology of aluminum in 2mol/L HCl solution at 25℃ were investigated by cyclic triangularwave potentiodynamic method over the potential range from 0.0 to -2.6V vs SCE and SEM analysis of aluminum surface after 200 cycles.The results showed that the magnitude of anodic pitting current decreased rapidly with cathodic potential limit going towards negative,leading to an obvious decrease in the size and density of pits on aluminum.At the same cathodic potential limit,however,the current diminished slowly with increase in the cathodic period,resulting in less change in the size, but significant increase in the density of pits.As cathodic limit became more negative than abort -2.4V vs SCE,the anodic current initially increased, reached a maximum value,and started decreasing to a megligible value,few small pits on aluminum surface were observed by SEM at higher magniication.This result suggested that cathodic potential limit was a key factor in determining anodic dissolution and surface morphology of aluminum although the cathodic time also affect anodic current to a certain extent.Also the process of hydrogen evolution during cathodic half cycle played a dual role (i.e.promotion and impediment) in anodic pitting during AC etching of aluminum.
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Received: 17 July 1998
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Corresponding Authors:
Zhanwen Xiao
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