roel_cnc wrote:
> --- In Homebrew_PCBs@yahoogroups.com, Adam Seychell
> <adam_seychell@y...> wrote:
>
>>Cathode current density (C.D.) normally between 10 ~ 20 mA/sq.cm.
>>Are you getting hydrogen from the PCB ?
>
>
> YES got real tiny bubbles also if i change amps as u describe it
In that case you plated amorphous copper, which is like copper
metal mud or sponge.
>
>>If so then C.D. is too high or copper too low.
>
>
> the copper must be to low then.
Also don't forget to keep an eye on the current density !!.
As Tom pointed out these copper baths can operate at 30A/ft^2
(30mA/cm^2), but it depends on the solutions agitation and
brightener. You can be safe at 10mA/cm^2 without brightener. I
run at 20mA/cm^2 with air bubble agitation and use brightener.
Tom made a very good point about the "Hull cell". One of these
are essential for testing the performance of your plating solution.
> can i do the same thing again with the terra cotta pot (if needed)
> with the same solution.
Of course, just put the pot back and continue generating copper
sulfate for as long as you want, when you want.
I'd get some copper sulfate pentahydrate crystals from the garden
store and make up a known solution so you can compare colors and
thus have some idea of the copper concentration in your plating bath.
>
>>To check approx. copper sulfate concentration make up a test
>>solution of your desired concentration (e.g. 80 g/L CuSO4.5H20)
>>and put it in a test tube. Then take sample of plating solution
>>and put into a identical test tube and fill to equal height. Look
>>though the end of each test tube and compare the color.
>>This will get you +-20% accuracy which can be good enough.
>>
>>
>>
>>roel_cnc wrote:
>>
>>>Hi,
>>>
>>>I'm trying to get me bath plating but it isnt working as it
>
> should be!
>
>>>only thing i got is a dark brown easely wipe of film
>>>pcb is 10 sq cm power supply gifs 1,8 volts ad 0,7 amps
>>>also tryt a 5 volt make same result only faster
>>>have to tell the bath solution is made as adam's style with a
>>>terracotta pot - acid is pritty blue
>>>
>>>gr. Roel
>>>
>>>
>>>
>>>
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