Seek advice on material selection for a medium with pH 4.5, 3% CI ion content, and a temperature of 90°C
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This post was last edited by wx_Catherine_Mi on 2024-6-20 at 11:54. Question: Regarding the selection of material for a medium with a pH of 4.5, a CI ion content of 3%, and a temperature of 90°C – does anyone have any recommendations for materials? Thank you! ! !
For a medium with a pH of 4.5, a CI ion content of 3%, and a temperature of 90°C, it is recommended to use materials with high corrosion resistance. Titanium or super stainless steels such as 904L, 254SMO, etc., can be considered. These materials possess excellent acid resistance and resistance to chloride corrosion, making them suitable for high-temperature and highly corrosive environments. .
Is the pressure and flow not being provided? That plastic can be used too
It’s basically at atmospheric pressure and in a vacuum; as for the flow rate, I’m not sure yet. Could you please give some advice? Thank you!
For CI ions, it is preferable to use a lined coating or duplex steel
If it is a heat exchanger, then TA2 can be chosen； The pipes can be non-metallic
Vacuum cannot use non-metals and metal-composite materials. HC276, I guess. The equipment can use graphite
Can titanium be used in acidic environments?
They are some reaction tanks, transfer tanks, and concentration equipment, basically operating at atmospheric pressure or under vacuum
Regarding the reaction tanks, transfer tanks, and concentration equipment you mentioned, considering that the medium has a very low pH value (4.5), contains 3% chloride ions, and operates at a temperature of up to 90°C, the following materials are recommended: 1. **Titanium (Ti)** – Titanium exhibits excellent corrosion resistance, especially in acidic environments. It can withstand corrosion from various chemical media, and is particularly suitable for environments with chlorides present. 2. **Hastelloy (such as C-276)** – Hastelloy is a nickel-molybdenum-chromium superalloy that exhibits excellent resistance to chloride corrosion, making it suitable for high-temperature and corrosive environments. 3. **Duplex stainless steels (such as 2205)** – Duplex stainless steels combine the advantages of both austenitic and ferritic structures, offering excellent mechanical properties and corrosion resistance; in particular, they have better resistance to chlorides than conventional austenitic stainless steels. All these materials can meet your usage requirements, offering excellent corrosion resistance and mechanical strength. You can choose the appropriate material based on your actual needs and cost considerations. If the operating conditions also involve other chemicals or more complex environmental factors, additional special materials may need to be considered. .