December 04, 2020, 03:47:57 PM
Forum Rules: Read This Before Posting


Topic: Removing zinc hydroxide without affecting chromium oxide  (Read 245 times)

0 Members and 1 Guest are viewing this topic.

Offline tms9918

  • Regular Member
  • ***
  • Posts: 17
  • Mole Snacks: +0/-0
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?

Offline chenbeier

  • Sr. Member
  • *****
  • Posts: 1208
  • Mole Snacks: +90/-21
  • Gender: Male
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.

Offline tms9918

  • Regular Member
  • ***
  • Posts: 17
  • Mole Snacks: +0/-0
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?

Sponsored Links