On the corrosion of valves caused by high-temperature alkaline solutions
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Hello, Haiyou. The evaporation system in our facility uses 316L valves, which suffer from severe corrosion; they start leaking within just half a year. Do you have any good suggestions? (Process conditions: 150 degrees, 50% ion-exchange membrane caustic solution.) It’s also a 150-degree, 50% diaphragm caustic solution (containing NaCl). What type of valve material would be resistant to corrosion in such conditions? Thank you!
At that time, I saw temperatures below 100 degrees, and it seemed to be a diaphragm valve being used. I hope I’m not wrong and this can be helpful to you.
The specific temperature needs to be known, and then a table can be consulted; generally, Hastelloy C and Hastelloy B work fine.
If it is indeed determined that the corrosion of the 316L valve body and internal components is caused by corrosive factors, other corrosion-resistant materials available include Monel alloy, Hastelloy B, and Hastelloy C.