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Chemical Cleaning of Blackened Copper Wires.

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After seeing the blackened C.P.C. in the metal back box in another post, I researched this matter and found this video clip showing the cleaning of blackened copper wires chemically, which should not remove too much copper as a mechanical abrasion might.

https://www.youtube.com/watch?v=TfEIEVrmzVw


Z.
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    mapj1:




    Does oxidation of the cores along the length of a multistrand cable affect its properties?




    Copper oxide generally becomes impervious to water and oxygen beyond a certain thickness, so once a patina has developed, corrosion is stopped by the oxide layer.

    (so plumbing pipes start bright, and then go dark, slowly reaching an equilibrium  with the environment.)

    It is a problem for very thin wires, as they may corrode right through or for applications with flexing, where the oxide layerr will keep being re-opened. In the case of this sort of wire, if you can get decent joints at the ends, I'd not be too worried about darkening in the bulk, so long as it is just oxide, and not aided by something more corrosive, like brown sauce.



     




    Loss of metal aside, are there any other effects that might affect the electrical properties of multistrand cable? Does it matter there's an effective layer of insulation between the strands?

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  • 0

    mapj1:




    Does oxidation of the cores along the length of a multistrand cable affect its properties?




    Copper oxide generally becomes impervious to water and oxygen beyond a certain thickness, so once a patina has developed, corrosion is stopped by the oxide layer.

    (so plumbing pipes start bright, and then go dark, slowly reaching an equilibrium  with the environment.)

    It is a problem for very thin wires, as they may corrode right through or for applications with flexing, where the oxide layerr will keep being re-opened. In the case of this sort of wire, if you can get decent joints at the ends, I'd not be too worried about darkening in the bulk, so long as it is just oxide, and not aided by something more corrosive, like brown sauce.



     




    Loss of metal aside, are there any other effects that might affect the electrical properties of multistrand cable? Does it matter there's an effective layer of insulation between the strands?

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