Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
Correct answer: B. Stainless steel
- A. Monel
- B. Stainless steel
- C. Graphite
- D. Kel-F and Teflon
Explanation
Stainless steel is unsuitable for aqueous hydrofluoric acid at 100°C because fluoride ions destroy its protective passive film and cause severe corrosion. Monel, graphite and fluoropolymers such as Teflon are much more resistant in this service.
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