Homebrew PCBs

It also depends on the HCl concentration.
Only add just enough HCl for it to work.
I see no rusting since I do this and keep the tank covered.

ST


On Mon, May 28, 2012 at 4:32 PM, Harvey White <madyn@...> wrote:
> On Sun, 27 May 2012 02:39:10 -0000, you wrote:
>
>>Hello, everyone,
>>
>>I've got a question that comes with a quick back-story.
>>
>>Last winter, I started etching with a batch of cupric chloride that I had made myself.  I was hoping to aerate it for a while for reuse, so I left the lid off the waste container and let it sit on the garage table.  Unfortunately, I left back to school about a week later, but thankfully my dad kindly covered it back up for me.
>>
>>Unfortunately, when I returned in the spring, I noticed that from that week with the lid off, the nearby power drill had developed a fine layer of brown rust on some of its exposed metal parts.
>
> That's fumes from the HCL inside.
>>
>>In retrospect, I should've predicted this, but I didn't since we've all discussed aerating our solutions without any issues.
>>
>>In light of "the unintentional etch," has anyone else had this issue before?  Also, how are y'all aerating your solution to avoid this problem?  I can imagine that aerating near something like a computer for a week could be disastrous since the vents expose the metal inside.
>>
>
> Happens a little.
>
> 1) store it outside.  A cheap plastic yard seat has storage in the
> bottom, so I'd leave it outside and away from things if at all
> possible.
>
> 2) etch outside, always.
>
> 3) if I run a batch of boards, depending on the etchant strength, it
> takes perhaps 20 minutes/board.  I run multiple boards, 2 or 3 sides
> at a time.  so it won't take that long.
>
> Harvey
>
>>I'd really appreciate any thoughts/hints for "responsibly" aerating!
>>
>>:)
>>
>>Many thanks for your input!
>
>
>
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