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Defect Testing

IP.com Disclosure Number: IPCOM000088325D
Original Publication Date: 1977-May-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bird, CL: AUTHOR [+2]

Abstract

For testing for defects, such as pinholes, in the insulation or passivation of a metal, such as aluminum, an indicator liquid of suitable redox potential is applied to the insulation layer. Where defects occur, electrochemical action between the exposed metal and the liquid result in the liquid changing color. The test is essentially destructive due to corrosion of the metal.

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Defect Testing

For testing for defects, such as pinholes, in the insulation or passivation of a metal, such as aluminum, an indicator liquid of suitable redox potential is applied to the insulation layer. Where defects occur, electrochemical action between the exposed metal and the liquid result in the liquid changing color. The test is essentially destructive due to corrosion of the metal.

Tests using, respectively, heptyl viologen dibromide, methyl viologen dichloride, and blue tetrazolium, have revealed pinholes in under five minutes, with the aid of low magnification, but one hour is suggested as a suitable test period.

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