Corrosion degree of potassium fluoride salt solutions on titanium (TA2) and 316L materials
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I’m seeking advice from experts: I currently have a three-effect evaporation system made of titanium (TA2) that is used to extract potassium chloride at a concentration of around 20%, with about 2% potassium fluoride as well. The pH level is neutral at the moment. Given these conditions, is this system capable of processing this type of salt? By the way, how is the 316L material in terms of quality? I earnestly request assistance from those who have used this device or have experience in treating fluoride ions with titanium materials. Thank you!
Fluoride ions cause severe corrosion of all metals by destroying the essential condition for metal corrosion resistance – a dense oxide layer – but their corrosive effect is reduced after stable fluoride salts are formed.
Fluoride-based products and fluorine chemical industries generally do not use stainless steel or glass-lined materials; in such applications, graphite heat exchangers and graphite concentration tanks are recommended.
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