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Thread: Calculating the surface area?

  1. #1
    GramSlam is offline New User
    Join Date
    Oct 2003
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    25

    Default Calculating the surface area?

    Hello,

    I have a quick question.

    Does anyone know if you can accurately calculate the surface area of the parts in the anodizingicon tank using the resistance between the parts and the cathodes?

    I am using a total of 256 in² lead cathodes. The parts I anodizeicon have many little spots that are difficult to measure.

  2. #2
    Fibergeek is offline Metal Finishing Guru
    Join Date
    Jul 2003
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    537

    Default

    It seems reasonable to think so, but there are two problems.

    1. Bare aluminum will have an extremely low surface resistance, way too low for any common Ohm meter. A conductance measurement would be required.

    2. Ionization effects; most liquids ionize when current flows through them, resulting in all sorts of variations in a resistance or conductance measurement. A repeatable measurement is next to impossible unless a liquid that won't ionize is used. Mercury would work, but this isn't practical.

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