Metal materials resistant to hydrochloric acid corrosion
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Our company wishes to manufacture a reactor (a moving equipment unit), with hydrochloric acid present in the medium. I want to use Hastelloy; could an expert please advise on what aspects need attention?
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What are your operating temperature and pressure?
I’m not sure what your reaction vessel is used for. In our company, the absorption systems for hydrochloric acid are all made of plastic or fiberglass, while the reaction systems utilize concrete tanks lined with acid-resistant bricks. The mixing equipment is either lined with enamel or carbon nitride. I’m not sure if this information is useful to you
Could you make the conditions clearer?
The use of austenitic stainless steel is strictly prohibited; chromium-molybdenum steel (12Cr2AlMoV) can be considered.
The temperature is between 80 and 100 degrees, and the pressure is below 1 MPa. Vigorous stirring is required during the reaction; nothing more can be said.
Why must metal materials be used? Metal materials may not be suitable for use in some cases; and those that can be used, such as Hastelloy, are very expensive. It is better to use glass-lined equipment, as it is cheaper and easier to procure. Unless there are extremely strict requirements regarding heat transfer, its use is generally not recommended.
Well, as mentioned earlier, it is a moving equipment with extremely high mixing power (for example, a tank with a volume of 1 cubic meter requires a mixer with dozens of kilowatts of power), and it is not easy to achieve large-scale, continuous production using glass-lined equipment.
Made of high-silicon cast iron, with a silicon content of 15–20%, it is highly resistant to acid corrosion. Due to its high silicon content, the surface of cast iron has a SiO2 oxide layer, similar to glass, making it an excellent acid-resistant material.
Don’t be afraid to spend money on large-scale equipment, as your medium is acidic; safety and corrosion resistance are both very important. Moreover, using high-performance metal materials saves a lot of trouble!! This is especially true for critical core equipment!! If it breaks down, it’s not just a matter of repair – it could lead to shutdowns and production halts, so such losses must also be taken into consideration!! I support the original poster’s choice of using special alloy materials