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Thread: Anodizing Q

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  1. #1
    Join Date
    Dec 2004
    Jeet yet ?

    Question Anodizing Q

    Why does real light colored anodizing seem to rub off when dark colors dont seem to do that ?

    I always liked black or dark colored anodizing, seemed to hold up good.

    Picked up a 2012 marker recently, very light, almost opaque color.

    When I got it I was disappointed, the color is worn down to the bare metal on the asa and barrel.

    "When injustice becomes law, resistance becomes duty." Thomas Jefferson

  2. #2
    Join Date
    Jan 2002
    Halifax, N.S., Canada
    It might be coincidence that your aluminum products with the lighter finish were not sealed as aggressively. This could result in a surface that wears faster and lets the color wear off.
    Except for the Automag in front, its usually the man behind the equipment that counts.

  3. #3
    Join Date
    Feb 2005
    Soon to be the Dirty jErZ
    I think that is more of a coincidence Allen. You probably have just run into some sub par anno work.

  4. #4
    Join Date
    Jul 2011
    United Kingdom
    Are you sure it's actually worn off or just faded?

    Some pigments used in annodising dye process aren't very UV stable and fade or discolour fast when exposed to sunlight

  5. #5
    Join Date
    Oct 2006
    Houston, TX
    There is a possibility but it is not common on commercial jobs. The ano temperature and rate affect the pore size and hardness of the layer at the same time. Good current and cold gets toward the hard, type III ano process with small pores. Long low current and warmer makes a softer layer that may have pores so big that the dye washes out in the sealer. The actual dye color doesn't affect the hardness, but some dyes will be able to work in larger or smaller pore sizes by either sticking in large pores or penetrating small ones.

    Once you wear the seal layer off the top, the open pores can loose the dye, especially from larger pores.

  6. #6
    Join Date
    Jan 2001
    Cottonwood, Az.
    What these guys said.
    The actual anodizing of the aluminum has nothing to do with the color. Color is just a dye in the annoed layer.

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