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Metal finishing Q&As since 1989
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Chemical resistance of 18/8
I wanted to use a stainless steel basket made from 18/8 to hold parts submerge in conc. HF and conc.HNO3, but I need to know if they can withstand these acids with a temperature of 35 degC?
Sam Tan- Singapore
2003
You do not mention the concentration of your acid mixture. At room temperature there would be a significant attack or etching. At 35C, I would expect the attack to be about 4 times faster. Depending on the thickness of the material, I would GUESS that the usefull life would be measured in contact days rather than months. Teflon is about the only thing that will stand up to your mixture.
James Watts- Navarre, Florida
2003
Probably not a good idea! Us a polyethylene or polypropylene basket.
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Lee Kremer
Stellar Solutions, Inc.
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McHenry, Illinois
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2003
Polypropylene will crack in warm nitric acid. Polyethylene will stand up fairly well, but should be inspected regularly.
James Watts- Navarre, Florida
2003
Thank you for the advice, I will try to find one of this basket that will fit in my 2 liter beaker [beakers on eBay or Amazon affil links] . Anyway, the concentration of the acids are HF 55% and HNO3 68%.
Sam Tan- Singapore
2003
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