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Hydrobromic Acid / Electroless Nickel Corrosion Resistance Data
Q. A customer contacted me today looking for corrosion resistance data for the affect of Hydrobromic Acid (9% concentration in oil, at 120-140°F)on Electroless Nickel. I have checked all the standard references and have not found any data. Is anyone aware of any data on Hydrobromic Acid on Electroless Nickel? Any help greatly appreciated.
David SuggPlating Shop - Collingdale, Pennsylvania, USA
2004
A. Hydrobromic acid is midway between hydrofluoric acid and hydrochloric acid. So, you might get away wit EN coating it if you use a high P EN. Check with your EN vendor for their comments. The upper temperature that you mention would make me inclined to predict eventual failure. Lab testing is probably the only rational way to check, and that would be long term testing. I would look at an appropriate stainless steel and not plate.
James Watts- Navarre, Florida
2004
A. James,
Thanks for your comments. I was guessing that Hydrobromic would be slightly less corrosive than Hydrochloric, since it is below it on the Periodic Chart. Otherwise, my thoughts are similar to yours in that I think High Phosphorus Electroless Nickel has the best probability of standing up, but even it will likely be attacked over time.
Again, thanks for your comments.
David Sugg- Collingdale, Pennsylvania, USA
2004
A. There is no data that I know of on the corrosion of EN in hydrobromic acid. However, pure nickel is very rapidly attacked by hydrobromic acid at all concentrations at room temperature. According to the Corrosion Data Survey, its corrosion rate is greater than 50 mils per year. I would expect that EN would be attacked at about the same rate at room temperature and at much higher rates at 120 °F.
Ron Duncan [deceased]
- LaVergne, Tennessee
It is our sad duty to note Ron's passing on Dec. 15, 2006. A brief obituary opens Episode 13 of our Podcast.
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