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Topic: What chemical can clean carbonized metal connectors?  (Read 1947 times)

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Offline xchcui

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What chemical can clean carbonized metal connectors?
« on: February 09, 2023, 09:21:39 AM »
Hi.

There are some mechanical ways to do that,but i am interesting
with the chemical way,which should be easier.
What chemical can i use to clean(remove)carbonized metal connectors etc.
which turned black due to repeated electric arcs?

Thanks.

Offline Enthalpy

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Re: What chemical can clean carbonized metal connectors?
« Reply #1 on: February 11, 2023, 09:02:48 AM »
The contact are of copper alloy like brass I suppose? Being black suggests they use the wrong material for repeated unplugging. A gold layer would be better, or some hard precious metal.

If the contacts are well accessible, I clearly prefer mechanical cleaning. (1) Eraser if possible, it's the most caring method (2) The scratching back of a sponge, works often (3) Fine sand paper. I haven't tried scouring powder up to now.

If not, you might try iron perchloride FeCl3. It tends to work faster than HCl. Rinse well any etchant, as it builds leak paths for electricity, and some electronic circuits are extremely sensitive to them.

I didn't try rosin and heat in this use, but this serves to deoxidize copper alloys when soldering.

Aluminium foil in hot (100°C) sodium bicarbonate or hot soda deoxidizes silver nicely. I didn't try on copper alloys.

Offline xchcui

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Re: What chemical can clean carbonized metal connectors?
« Reply #2 on: February 14, 2023, 12:06:09 PM »
Thanks  Enthalpy.

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