Help: How to prevent corrosion of steel pipes? Hero, come in
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The steel structure platform in question uses ordinary steel columns; soy sauce spilled on these columns at the top has caused the surface of the columns to peel off. What methods can be used to address this issue? The company is currently using epoxy resin along with topcoat for treatment – are there any better methods to prevent corrosion from saltwater? Should we use another material for the steel columns? Thank you. . Steel column specifications: Ф165×4.5 welded pipe. Last edited by nanjingdaxue on 2009-4-7 20:00]
The saltwater in soy sauce causes severe corrosion of the steel column surface; even after treatment with epoxy resin, the surface continues to corrode and peel off
Why not address the problem at its source? Can’t the soy sauce be prevented from flowing onto the platform?
What you said about the 3rd floor is correct; however, the cost of using stainless steel pipes for all the connections is quite high. Currently, flexible hoses and rigid pipe couplings are being used. I think the problem should be addressed at its source, and if that’s not possible, then something can be placed under the couplings. It’s just that the tube is heavy
It is best to use isolated protection, and any parts that are already rusted should also be replaced.
The corrosion resistance of steel pipes can be improved through the \"heat-dip aluminizing\" process; it offers good corrosion resistance, as well as tolerance to high temperatures (up to 500 degrees), wear resistance, and low production costs.
What type of epoxy resin are you using? Is it an epoxy-based paint? It is recommended to use electrostatic spraying of epoxy resin for corrosion protection; this method provides excellent resistance to acids and alkalis as well as strong adhesion, so problems such as peeling that you mentioned will definitely not occur
This is my first time posting on HaiChuan, and I realize there are really many experts here. As the user in post 7, I don’t quite understand the \"hot-melt aluminum dipping\" process ? And it’s cheap too? I’m not quite sure. Could you explain it again? Reply to post 8: Yes, epoxy resin paint is used; the electrostatic spraying of epoxy resin is employed for corrosion protection ? The price will be very high, right?
The lifespan of a coating is closely related to the quality of surface treatment. When using coatings for corrosion protection, what method does the poster use to remove rust? What level of rust removal has been achieved? What are the ingredients of soy sauce? What are the paint brands and grades?
In such cases, the construction techniques for pipeline anti-corrosion coatings can be used as a reference; that is, a layer of glass fiber cloth is wrapped around the surface of the steel structure, which prevents the anti-corrosion coating from being damaged.
The selection of surface treatment and primer is crucial. Is there any practical basis for what was said upstairs? I have seen with my own eyes the phenomenon of the fiberglass layer outside pipes (that are not buried) peeling off.
Do you think the surface rust has been cleaned properly? If the rust has been removed thoroughly, it’s important to choose an appropriate primer (anti-rust paint). It may also be useful to use a double-layer primer system, that is, an anti-rust primer followed by a ceramic primer, with a ceramic topcoat applied on top; this is likely to yield better results. This method is also used for corrosion protection in many military products. For applying the paint, electrostatic spraying is the best option, and the cost isn’t high either – all that’s needed is an additional compressor and spray gun! But this kind of ceramic is really precious! It should also be noted that if your system is installed outdoors, you shouldn’t use glass cloth for wrapping, as you are in the food industry; glass cloth contains asbestos, and it can easily peel off under prolonged exposure to sunlight, leading to food contamination, which is not acceptable (My personal opinion is for reference only)
The key issue isn’t the need to regularly renew the anti-corrosion coating, right? It’s probably because the coating gets corroded by saltwater quite quickly – could it be that the coating’s density is not good enough? This causes saltwater to penetrate directly into the surface of the steel columns, which is why corrosion occurs more rapidly. It’s necessary to clean them properly, and increasing the thickness of the coating can help improve its density. Additionally, it might be better to choose coatings that are hydrophobic.