change in electrical properties due to powder coating on metals

Discussion in 'General Electronics Chat' started by Dhaval Trivedi, Dec 21, 2015.

  1. Dhaval Trivedi

    Thread Starter Member

    Jun 10, 2015
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    I have heard that powder coating removes the electrical properties of metal.it becomes insulated.so you remove the powder coating(masking) where you require electrical connection
    Kindly elaborate
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
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    Powder coat is basically melting plastic over and object- plastic is an electrical insulator- you must get under it to make electrical contact with the base metal.
     
  3. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    @Dhaval Trivedi

    If you are not referring to polymer powder coatings (the most common), nut mean electro spray or plasma spray metal oxide / ceramic powder coating, the same is true. Only elemental metals are conductive, metal oxides (e.g. rust) is an insulator. Aluminum oxide (alumina), titanium oxide (Titania) and various others are non-conductive. You must remove the oxide/ceramic layer to reach the base metal to find the conducting layer.
     
  4. Dhaval Trivedi

    Thread Starter Member

    Jun 10, 2015
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    Doe most of the time plastic spray is used.

    are there any other option for spray ?
     
  5. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Read post #3.
     
  6. SLK001

    Well-Known Member

    Nov 29, 2011
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    Basic paint is an insulator also.
     
  7. Dhaval Trivedi

    Thread Starter Member

    Jun 10, 2015
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    Is the only purpose of powder coat is for look or they have any other purpose also.

    Sometimes i have seen even the inner metals are poweder coated which are not exposed in an product ?
     
  8. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Coatings are generally applied to either
    a) make the product look nice
    b) prevent corrosion
    c) electrical insulation (in a way, similar to (b))

    Remember, even if the metal is not exposed, humidity and splashes can penetrate so corrosion is possible. Different places in the world have differing humidity/temps that cause corrosion.
     
  9. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    Powder coated products are coated all over unless parts are masked off just like in painting. But unlike most types of solvent based paint, the powder coating is applied using both air and electrostatic voltage. The electrostatic pare of the application make the powder go to all surfaces, even ones on the inside or back side of the object being coated. The electrostatic is needed to get the pigment to cling to the surfaces until they are heat cured. The color/pigment is actually finely ground plastic that melts together to form a surface coating after curing.
     
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