How does silicon carbide perform in strong nitric acid due to its heat resistance?
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I’m looking for a magnetic pump that can withstand heat from about 50% concentrated nitric acid (at around 120 degrees Celsius). The pipeline should be lined with PTFE, but some parts of it are made of silicon carbide. The manufacturer claims that this pump is suitable for such conditions, but I’m skeptical. I wonder if anyone has used it before; could you recommend any options?
Silicon carbide is completely resistant to nitric acid
Under 120°C and 65% nitric acid, the corrosion rate of silicon carbide is approximately 0.001 mm/year; therefore, it is safe to use silicon carbide
The last edit to this post was made by LZD420983 on 2020-11-17 at 10:19. There is a classic example that can answer your question: when the material in contact with the reactor or pump contains hard crystals or solid particles, the rotating and stationary rings of the mechanical seal should use a silicon carbide-silicon carbide combination (under normal operating conditions, a silicon carbide-graphite combination, one soft and one hard, is used); this arrangement takes advantage of the high wear resistance of silicon carbide.
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