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Breakdown Voltage

From METALAST International, Inc.
 

 
Breakdown voltage testing was performed on the anodic oxide generated on 6061-T6 material under Type III anodizing conditions using the METALAST Technology. The effects of oxide thickness and sealing in hot deionized water were examined. 6061-T6 coupons (4"x 4") were anodized to approximately 2, 3, and 4 mils under Type III (MLT-III) conditions at the METALAST Tech Center. Six coupons were anodized at each thickness. Three coupons were left unsealed and three coupons were sealed in hot deionized water for one hour per mil of oxide. The breakdown voltage of the samples was measured according to ISO 2376. A single ball electrode was used with a 500 g load. The voltage was increased at a rate of 25 V/second. Breakdown was defined as passing 100 µA. Each sample was measured in ten separate locations. The following table contains the breakdown voltage results. Conclusion: The breakdown voltage increases with increasing oxide thickness. However, the breakdown voltage per micron increased between 2 and 3 mils, but then decreased between 3 and 4 mils. Sealing increased the breakdown voltage at each oxide thickness.
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