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Thread: Faucet filiform corrosion - photo

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    Duke_of_URL (Apr 26, 2022), durrelltn (May 2, 2022), Inner (Apr 25, 2022), nova_robotics (Apr 25, 2022), Philip Davies (May 1, 2022)

  3. #2

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    I think it looks interesting Never having heard of it I had to look it up.

    From https://www.corrosionpedia.com/defin...form-corrosion

    What Does Filiform Corrosion Mean?
    Filiform corrosion—also known as "underfilm," "localized" or "filamentary" corrosion—is a type of corrosion occurring commonly within magnesium and aluminum alloys that use an organic form of coating (typically, organic coatings 0.05 to 0.1 millimeters thick) when exposed to warm and humid air. However, it can also occur on other coated metals such as steel, iron and zinc.

    The mechanism for corrosion allows water and oxygen to migrate. The dissolved oxygen has its highest concentration at the back of the head. When the oxygen is reduced in the tail region, the metal ion dissolution and formation proceeds to the head. This type of corrosion tends to take place in high-humidity conditions. Nitrates, sulfates, carbonates and condensates that contain halides have been associated with filiform corrosion.

    Filiform corrosion affects surface appearance with no consequence for the substrate’s mechanical resistance. This type of corrosion develops on defects or weak points of lacquered surfaces—and surfaces similar to lacquered surfaces—and spreads in the form of filaments.

    Filaments are made up of a head and a tail; these, in turn, make up the mobile electrochemical cell on the surface of a substrate. These make up the two different sites:

    The filament head, which is the anode.
    The filament tail, which is the cathode.
    Corrosionpedia Explains Filiform Corrosion
    Filiform corrosion can occur in conditions slightly above room temperature and at a humidity level of 75%.

    In places where filiform corrosion has occurred, a thread-like filament forms under the coating. The coating will bulge and have an appearance like that of a lawn riddled by mole tunnels. The filament will then continue to form until the coating is no longer continuous. Filiform corrosion can form with forming with a number of coating systems.

    Filiform corrosion's unique appearance resembles fine filaments that look like worm-like threads and that seem to emanate from one or more defects in a slightly random directions. Normally, it doesn't extensively damage the metal. However, it has a detrimental effect on the corroded metal's appearance.

    For instance, filiform corrosion within magnesium or aluminum can form a white precipitate, resulting in a tail. On the other hand, filiform corrosion in iron tends to form a head with green fluid and a tail of red precipitate. Filiform corrosion often starts off as coating defects like scratches and weak points such as beards and holes.

    A number of approaches have been known to reduce filiform corrosion. One of them is applying several coating layers. One might also use a chromate containing a primer on aluminum or a conversion coating. Zinc with a primer on steel can also be used as a treatment.

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    Altair (Apr 30, 2022), Inflight (Apr 25, 2022), Moby Duck (Apr 26, 2022), Toolmaker51 (Apr 25, 2022)

  5. #3
    Supporting Member Toolmaker51's Avatar
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    So, it isn't diagramming the latest gerrymandering scheme?
    Sincerely,
    Toolmaker51
    ...we'll learn more by wandering than searching...

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    Supporting Member Frank S's Avatar
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    Just bake it a 300f for half an hour scrub lightly with a light grit 3m scrubber, dip coat it in lacquer box it up and sell it for big bucks due to the unique patterns
    Never try to tell me it can't be done
    When I have to paint I use KBS products

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    Supporting Member marksbug's Avatar
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    for sure!!! we could go out and buy up a few hundrad stick them out side for a year then rake in the millions!!!

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    Supporting Member Frank S's Avatar
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    Quote Originally Posted by marksbug View Post
    for sure!!! we could go out and buy up a few hundrad stick them out side for a year then rake in the millions!!!
    Wouldn't work where I live. I sandblasted tractor rim nearly a month ago and it still hasn't turned brown
    Never try to tell me it can't be done
    When I have to paint I use KBS products

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    Supporting Member schuylergrace's Avatar
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    Does anyone know how to cause that to happen in a reliable way? All I can find are ways to prevent it, not cause it in a reproducible way. I wonder what metal that is on the faucet, too, since most seem to be chrome or nickel plated, but I'm mostly finding references to aluminum and steel. FYI, I'm not thinking about doing all my plumbing fixtures, but maybe using it as an element of metal-based artwork.

    For topical application, only. Not to be taken internally or used in com-
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    Do not operate heavy equipment, unless you actually know how to.



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    Supporting Member marksbug's Avatar
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    your luckey !!! many times I think this stuff happend at the factory and just took a while to grow bigenough to see.

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    Supporting Member howder51's Avatar
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    The guy played by Russel Crowe in "A Beautiful Mind" would have a heyday with those patterns!

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    marksbug (Apr 26, 2022)

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    Quote Originally Posted by Frank S View Post
    Wouldn't work where I live. I sandblasted tractor rim nearly a month ago and it still hasn't turned brown
    Lucky you, if a nickel's worth of paint chips off here, the rest drops off in sympathy.



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