What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
(OP)
Hello Everyone,
I am glad to be on this amazing forum of Engineers. So I am working on this project where I have to select the best coating (to resist corrosion and increase strength) for magnets which will be used in oil/gas pipes and will be in contact with fluids (H2S, Mercury). The type of magnet I am using is NdFeB grade N40SH. I searched online and found different types like PVD, passivated coating, phenolic coating. I am not sure which one is the best for my application. I want something that is reliable, durable, has strong chemical resistance, abrasion resistance, etc . Please let me know if you know any coating for magnets that can fit into my application. Thanks a lot in Advance.
Thanks
Masih
I am glad to be on this amazing forum of Engineers. So I am working on this project where I have to select the best coating (to resist corrosion and increase strength) for magnets which will be used in oil/gas pipes and will be in contact with fluids (H2S, Mercury). The type of magnet I am using is NdFeB grade N40SH. I searched online and found different types like PVD, passivated coating, phenolic coating. I am not sure which one is the best for my application. I want something that is reliable, durable, has strong chemical resistance, abrasion resistance, etc . Please let me know if you know any coating for magnets that can fit into my application. Thanks a lot in Advance.
Thanks
Masih





RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
What if you had no option other than coating? Can you suggest any coating that will last the most?
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
Cmpositepro: The magnets are used to collect the iron/metal particles from the fluids.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
collecting particles seem not to be a critical application, recommend to use Sm-Co or AlNiCo magnets to against the corrosion. you can increase dimension or optimize the design to increase the "sucking" force. Note that no coating can increase magnetic strength.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
What about passivation or PVD coating? Any idea if that's better than everlube ??
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
Housing your magnet with 4xx stainless steel (not sure if anyone did this or not) not only help resist but increase the mechanical strenght. make sure fully sealing wihtout leakage.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
i cannot tell the difference of corrosion reistance between everlube and PVD.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
If I had to use Neo I would use electroless Ni with a conformal coating over it.
Another option over the Ni would be a resin like PEEK or PPS. Due to permeation and reactivity of hte Neo you will have finite life (measured in months not years).
I have seen hermetic metal cans with 316 SS sides (non-magnetic) and 448 end plates (ferromagnetic) on the pole faces. These are laser welded, and if they are made right don't change the external field at all.
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Plymouth Tube
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
How long do you guys think this coating will last?
http://www.mceproducts.com/Knowledge_Base/Articles...
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
They made rectangular cans by deep drawing 305 SS (can't use 304 or 316 unless you want to re-anneal, they will become magnetic when worked). The cans were a tight fit for the magnets, and they had a flange around the top edge.
The magnets were coated with a resin, but just enough so that they wouldn't rattle.
They were put into the cans, vacuumed and Ar backfilled, and a 448 cover plate was welded on.
So only one pole had a magnetic face, but the bottom of the can was only 0.012" thick so it didn't add much air gap.
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Plymouth Tube
RE: What is the Best protective coating for magnets (5"x3"x0.5") used in Oil/Gas pipes.
Let me first tell you that you guys have helped me alot and you are amazing people.
I am still working on this issue and recently found out about black epoxy coating for magnets? Would you guys suggest it? The magnets will not be exposed to process fluids continuously. The magnets will be exposed to oil/gas for one day every 6 months. So coating should be good enough but I just want to make sure that I have the best coating when it comes to the life of the coating.
Thanks
Masih