Corrosion protection for dilute nitric acid equipment! I hope someone knowledgeable can clarify this for me!
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For equipment used to contain dilute nitric acid, carbon steel is considered as an option due to cost considerations, with an anti-corrosion coating applied to the interior. Is this a viable approach? I hope some expert will kindly offer their guidance. I am extremely grateful.
Bro, you can use steel-lined PTFE
The material of carbon steel lined with PE is much cheaper than PTFE, and it utilizes an international new technology that allows for one-piece molding of the lining, resulting in no welds and no leaks.
Stick with 304L; it’s safer and offers better value in the long run
It’s completely possible, but the material for the anti-corrosion coating must be chosen carefully – it should be easy to apply, cost-effective, and possess strong anti-corrosion properties.
You can choose to apply PTFE coating, which is a bit cheaper than using PTFE-lined plates
Fiberglass can be used for corrosion protection; I’m not sure how large your container is. Glass is a suitable option, and its price isn’t high either. What is the concentration of nitric acid? And what about the temperature?
Nitric acid with a concentration of 40% or less can use PP as a container, but due to material limitations, the capacity of such containers cannot be very large. Large containers all feature a steel-lined structure.
Today’s polymer coating technology is already quite mature; it can fully replace stainless steel in terms of equipment protection, so it’s worth giving it a try.
There are many answers upstairs; I want to know them too. Which one is better?
Use metals whenever possible instead of non-metals; it is recommended to consider 304 steel, as it is more reliable than PP and PE, and its cost is not much higher than that of carbon steel lined with plastic. 304 is reliable when used with dilute nitric acid, and it has a high residual value in the future.