With HF and HCl present in the environment, what material should be used for the enclosures of field instruments?
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It turns out that the casings of these instruments are mostly made of cast aluminum; the same is true for transmitters, thermal resistors, thermocouples, and rotameters. However, corrosion is very severe, and in some cases the casings have become so corroded that they cannot be opened. I would like to ask what type of material is suitable for instrument enclosures in an environment containing hydrogen fluoride and hydrogen chloride?
A world without petrochemical and chemical industries is also unimaginable; what’s possible is to minimize pollution as much as possible!
Generally, the part where liquid collects is lined with 4F material. If it’s meant to be the outer shell, stainless steel won’t work, nor will titanium; only HB material can be used
How about a plastic casing? Or cover it with a layer of plastic?
The casing should be treated to prevent corrosion; apply butter to the threads when closing the lid, and also apply butter to the casing itself to prevent corrosion. Be careful, as regular inspection and maintenance can easily stain clothes
Applying butter to the threads is a good idea
I suggest you try stainless steel 304SS
Engineering polyester is more corrosion-resistant than stainless steel; European-style meters are available, and junction boxes can also be considered.