Steve Turner wrote:

> Being a chemist by profession, I found the recent thread on PCB
> chemistry quite interesting.  Electrolytic rejuvenation of FeCl3
> etchant is something that I've been meaning to try for ages.

> Which leads to the following point: what should the anode be made
> of?  One gent mentioned using steel. With all due respects, I'm
> surprised that that works, unless the steel is the "right" kind
> of stainless.  The problem is this: oxidation occurs at the
> anode, and if the anode is made of an easily oxidized metal, the
> anode itself will oxidize and erode.  (For the purposes of this
> argument, iron and many types of steel classify as "easily
> oxidized.")  Because the current is serving to oxidize the
> material of the anode, little or no rejuvenation of the etchant
> will occur.


Maybe try a carbon rod from the centre of a D-cell
battery? They always suggest using these in science
kit type electrolysis experiments. And they have a metal
cap you can solder a wire onto.
-Roman

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics