HP-12C: Corrosion on Negative Terminal


Does anyone have a solution for preventing copper oxide corrosion from developing at the negative battery terminal (the platted plunger type contact). I'm guessing the copper oxide is caused by cathodic corrosion which is developing between the two different metals of the battery's negative surface and the calculator's non-tinned negative terminal.


Try tinning the copper contact spring near and at where it touches
the battery. Solder is less reactive than copper.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP Prime print terminal CD Dodds 4 1,839 12-06-2013, 10:25 PM
Last Post: CD Dodds
  WP-34s negative shifts Andrew Nikitin 5 1,158 06-12-2013, 04:10 AM
Last Post: Marcus von Cube, Germany
  HP 67 Calculator Battery Terminal plus/minus Steve E. 6 1,621 04-30-2012, 03:29 PM
Last Post: Nick R
  HP-35 powers with negative numbers Dan Lewis 26 4,426 01-26-2012, 02:41 AM
Last Post: Nick_S
  Corrosion ... best way to remove? Gene Wright 6 1,340 10-19-2011, 04:23 PM
Last Post: Ethan Conner
  HP 12C, 12C Platinum & 15C iOS App Walter Lam 2 998 06-02-2011, 01:25 PM
Last Post: Andrés C. Rodríguez (Argentina)
  HP 30b programs Interest Rate conversions Negative Periods per Year and Fractional Periods per year Gene Wright 1 640 05-03-2011, 11:25 AM
Last Post: Bart (UK)
  Heat staked keyboards with sticky, bouncy or corrosion present keyboard PCAs Geoff Quickfall 12 2,475 08-15-2009, 07:55 PM
Last Post: Geoff Quickfall
  HP 50g, degree mode, complex polar numbers w/ negative angle Paul Ozog 5 1,175 10-22-2008, 02:05 AM
Last Post: V-PN
  HP 50G Cube Root of Negative Hal Bitton in Boise 8 1,543 10-16-2008, 06:52 PM
Last Post: V-PN

Forum Jump: