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[Solved] Paints Direct to Rust: Chemical Reaction, Iron Oxides, Corrosion Inhibitors, Hammerite Performance

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  • #1 8346713
    Anonymous
    Anonymous  
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  • #2 8346809
    Filip
    Level 23  
    Maderkite shakes. If there is already rust, then with a little moisture a FexOy / Fe cell is formed and the corrosion is fine. Zinc paints are effective because the zinc in the Zn / FE cell is dissolved first.
  • #3 8347036
    Tommy82
    Level 41  
    I used to use something like a complexor and as for making a whip with g..a, i.e. painting the rust, the effect was satisfactory, but it is a priming paint.
    As for Hammerite, I have the balcony railings painted with it and I agree with you owik.
  • #4 8347193
    Tommy82
    Level 41  
    I used to rust with phosphorus and he just had to have a passivator on board because the surface was just getting darker. Well, it is a protection against corrosion like red lead.
  • #5 8347292
    DJ MHz
    Level 25  
    J. Kleban wrote:
    My mechanic used to use something that looked like a lotion after lubricating it (roughly cleaning the surface from rust), the surface turned black and he claimed that the lotion oxidizes it in the same way as the barrels of a firearm are oxidized and it is the best protection and at the same time a good primer under the paint .
    I just don't know what it was called.


    This measure is very expensive. You have to pay about PLN 2-3 thousand per liter.
    It breaks down the rusts and protects against further corrosion.

    It is used in KGHM - it is used to paint ceiling supports, which are exposed to rust, because they sit in silt most of the time.
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  • #7 8347506
    mczapski
    Level 40  
    I have been saying for years that rust can be painted even with watercolors . What matters is the effect, which means that no rust is visible. The corrosion process continues under the coating. I guess it's mainly about steel, cast iron, etc. Unfortunately, each layer of oxidized material has to be removed to relatively stop the process. And these rust-inhibiting paints have the property that they form a thick film that sticks to the material better, creating an impression of correctness. As for rust removers, I recently bought something from Leroy, that when I left the rim wet to remove rust stains, the next day I had everything red (rusted). I still believe a bit in CORTANIN, which, however, seems to have disappeared from the market. He was probably too good.
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  • #9 8349186
    Anonymous
    Anonymous  
  • #10 8349385
    kkknc
    Level 43  
    About 14-15 years ago I painted the freshly welded gate with paint for painting ships to this day. The second one, after making it, was sandblasted, then it was painted with a primer (red oxide) and with topcoat paint (some Polish without a revelation) it is 8 years and it is ok. Of course, I haven't painted any of them so far.
  • #11 8349532
    jendrula60
    Level 12  
    I have already practiced Cortana, polrust (better in my opinion), but the rust polyurethane paint called Cekor stuck best. There was a letter there. It reminds me of "R" but I won't give it a head. I applied to a rusty fence and was pleasantly surprised.
  • #12 8467275
    Anonymous
    Anonymous  
  • #13 8467528
    Urgon
    Level 38  
    AVE ...

    For rust removal, calcium hydride can be used, which is a strong reducing agent, especially for metals. Lightly moisten the place of rust, sprinkle with calcium hydride and keep your fingers crossed. Calcium hydride will react first with water:
    CaH2 + 2H2O -> Ca (OH) 2 + 2H2 ?
    The hydrogen will react with the iron oxides to take away their oxygen. Calcium hydride will also react with them in the same way, receiving oxygen ...
  • #14 8469932
    Anonymous
    Anonymous  
  • #15 18093085
    lucrum.cesans
    Level 11  
    I renew the thread :)

    What is your recent experience with rust paints?

    1. Hammerite,
    2. Steel ruffle,
    3. Snowball for rust.

    I recently painted the steel chute 5 years ago and it holds up nicely, but I don't know if the company has finished the product :)

    Thanks in advance
    LC
  • #16 18093138
    viayner
    Level 43  
    Hello,
    the paints "on the rust" should react with the surface, creating a "supplementary" cell is a good option, but most of them simply have an increased adhesion to the rust and do not come off, as if there is corrosion, it is impossible to stop it, you can slow down the reactions better or worse .
    Regards
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Topic summary

The discussion revolves around the effectiveness of paints designed for application directly onto rusted surfaces, particularly focusing on chemical reactions with iron oxides and the role of corrosion inhibitors. Participants share experiences with various products, including Hammerite, which is noted for its long-lasting adhesion but limited ability to prevent further oxidation. Other mentioned products include Cortanine, Brunox Epoxy, and various rust removers. The consensus suggests that while these paints can adhere well to rust, they do not completely halt the corrosion process, as oxidation may continue beneath the paint layer. Techniques for rust treatment, such as using phosphoric acid and calcium hydride, are also discussed, highlighting the complexity of rust management in metal surfaces.
Summary generated by the language model.
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