Re: Corrosion abatement

about cleaning pcb's

I often clean silver spoons in a bucket with soda and water. (soda is http://en.wikipedia.org/wiki/Sodium_carbonate) and a piece of aluminium foil. the chemical reaction reduces the silveroxides to copper and the aluminium gets dark. maybe the same could be done to pcb's. be aware that aluminium on the pcb's is vulnerable as well!

simon

On 29-01-14 08:18, tommoni wrote:
> Hi Tom, hi everybody
>
> concerning cleaning a board with fluids:
>
> Vinegar is a fluid, which is an acid. Not a very corrossive acid like
> sulfur-acid or similar acids, but in fact it's an acid!
> Boards contain copper, metal components and tin (stannum) or
> gold-contacts, all of those materials - except of gold - will be
> corroded by any acid, fast or not so fast, that doesn't matter. So in my
> opinion, it's not a good idea to clean a board with vinegar in order to
> get broken or corroded contacts or connections repaired.
>
> Instead of this, I would use an alkaline solution like soap-water or
> dishwasher-soap, but never a corrosive acid. Alkaline solutions are able
> to stop corrosion if there is any corrossive acid fluid on the board
> and, by the way, soap-water also cleans grease, dust and dirt on the
> board. No components are affected permanently in their electrical
> behaviour, except of perhaps very old caps with broken rubber cover
> gaskets. Of course you will have to dry the boards after this treatment
> carefully. It's recommended to store the boards vertically at a warm
> place for several days before activating them again.
>
> The only really working solution to get corroded boards work again is to
> trace the connections with an ohm-meter and solder by-pass wires, but
> unfortunately this is plenty of work to do.
>
> Finally: I don't know, when or who brought up the idea to clean corroded
> boards with vinegar. It could not have been a chemist, for shure!
>
> greetings: TOM from Bavaria, the center of Europe, the country of the
> Alps, the marvellous castles of Koenig Ludwig and last but not least:
> The original Octoberfest
>

-- 
Met vriendelijke Groet,

Simon Claessen
drukknop.nl

-- 
-- 
-----
You received this message because you are a member of the LisaList group.
The group FAQ is at http://lowendmac.com/lists/lisa.html
To post to this group, send email to lisalist_at_email.domain.hidden
To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden
For more options, visit this group at http://groups.google.com/group/lisalist
--- 
You received this message because you are subscribed to the Google Groups "LisaList" group.
To unsubscribe from this group and stop receiving emails from it, send an email to lisalist+unsubscribe_at_googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.