On Thu, 21 Nov 2013 19:57:17 -0800, OldGuy
wrote:

Electronic flash has corroded electrical contacts. Duracell AA
batteries leaked. The contacts are molded into a plastic holder and
cannot be easily removed. I have cleaned the metal contacts using a
diamond tip. I did this a few months ago and the contacts re-corroded.
Again cleaned but what can I do to retard corrosion? Some in place
coating or plating?

Copper contacts?

Grease. Any type that excludes oxygen and water. Keep those out and
the copper won't corrode. Yeah, it's messy, but how often do you
change the batteries?

Bright electroless tin will inhibit corrosion. You won't like the
price:
http://www.caswellplating.com/electroplating-anodizing/tin-plating-kits/electroless-tin-plating-kits.html
Hot tin plating is cheaper and better, but messy.
http://www.caswellplating.com/electroplating-anodizing/tin-plating-kits/tin-electroplating-kits.html

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558