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The interior of anodized metals is as conductive as the bulk metal that constitutes the anode. Whether the layer formed by anodization is itself conductive depends on the metal anodized and the conditions of anodization. The layer formed by anodizing many aluminum alloys, near one extreme, is so poorly conducting that thin sheets of properly anodized aluminum can be rolled to create a circuit element with a high electrical capacitance in a small space. Near the other extreme, lead can be anodized to produce a coating of lead oxide that is sufficiently conducting to function in a lead/acid battery that provides the electrical power to crank a car engine.

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12y ago

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