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Topic: Removing zinc hydroxide without affecting chromium oxide  (Read 1847 times)

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Offline tms9918

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Removing zinc hydroxide without affecting chromium oxide
« on: October 24, 2020, 01:56:20 AM »
As by title, I would like to remove zinc hydroxide from oxidized plated screws.
I found that acetic acid dissolves the zinc hydroxide very nicely, but it completely removes the chromium oxide as well.  Is there something that dissolves the former but not the latter?
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Offline chenbeier

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Re: Removing zinc hydroxide without affecting chromium oxide
« Reply #1 on: October 24, 2020, 03:24:21 AM »
Try with sodium hydroxide, takes a wile. Any acid dissolves zink and chromium. Hydroxide attacks zinc but chromium in minor.
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Offline tms9918

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Re: Removing zinc hydroxide without affecting chromium oxide
« Reply #2 on: October 24, 2020, 03:55:21 AM »
Thank you I will try!
By "a while", what order should I expect? minutes / hours / days?
Is 1 mol/L something reasonable?
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