Hi to all,
got a number of Speakon connectors yesterday that have solder pins on the back for PCB mounting. Unfortunately, they must be very old stock and the once shiny silver plating has gone very dull and brownish - naturally they are not easy to solder.
What is the best way to remove the ( silver sulphide ) tarnish and make the pins solder friendly again ??
BTW:
I am using old fashioned 60/40 " Savbit " five core solder.
.... Phil
G'day Phil
I have cleaned up resistor leads & similar with steel wool, admittedly steel wool strands are not a good thing around pcb's but with care perhaps ?? The other thing (that I have not tried) would be a rub with alfoil ?? Even a dab of "The forbidden compound" might get you through. Maybe a rub with Duraglit wadding might clean them up too.
Cheers ......... Rheilly P
A possible alternative to steel wool is the cheapo green kitchen scourers. Might we worth a try.
Microscrub would be ideal if it was still around......
"Rheilly Phoull"
** Shame they ain't silver plated.... Phil
A fiberglass eraser works pretty well on small pins and surfaces. At least the residue is non-conductive, unlike steel wool.
"Adrian Jansen"
** Que ???.... Phil
There was a thing that silver tarnish could be removed by dipping it IIRC in an aluminium pot containing salted water (or it might have been a mild alkaline - but I think salt). A rub with properly wetted aluminium foil might do the job.
Here you go!
RS had one in their latest specials flyer also. Only just noticed it about an hour before logging onto this group for today.
ALAS so true !!
** Got any idea what chemical " Tarn Off" contains.
It dissolves the sulphide quite quickly.
..... Phil
Thiourea and phosphoric acid and a bit of detergent.
Hmmmmm, best not to use the coffee mug for it then ??
Jaycar sells them under a name Corrosion Buster Pen, NA-1410
tOM
**Why?
Read the label on a Coca Cola container sometime. No detergent, but plenty of phosphoric acid. Pretty handy stuff, phosphoric acid. It's food grade and you can even use it to clean your swimming pool chorinator.
**Here's some possible remedies (I've tried most)
**I had no idea there was another kind of solder (worth bothering with).
Yep anybody required to meet ROHS *must* use non lead solder. Surprised you aren't aware of that.
MrT.
y
and
Yes, but you wouldnt drink that s*it ;)
Agree 100%. on that.
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