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Electrolysis, what's wrong?

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Hendrik

02-24-2003 06:39:07




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I'm experimenting with electrolysis in a 1 gallon plastic bowl. I use a steel strip of 1 inch by 10 inch as sacrificial anode and the sheet metal part to be cleaned is a little smaller. The process does work but it goes very slowly. It has been on for approx. 5 hours and still only half the paint is gone. At 12 V (rated output 6 Amps)my charger puts out only 0.3 Amps. The soda concentration is 1 tablespoon per gallon of water and a whitish sludge forms on the sacrificial anode. What can I do to speed up the process?
Your help will be greatly appreciated. Hendrik

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George - Electrolysis How To Website

02-26-2003 09:03:01




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
This website is the best information I have ever see regarding the use use of electroysis for derusting.

I have a 45 gallon tank set up with lye and am cleaning up my 1940 Farmall A parts.

My advise is to use a stainless steel electrode.

George from Alberta

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George - Electrolysis How To Website

02-26-2003 08:57:56




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
This website is the best information I have ever see regarding the use use of electroysis for derusting.

I have a 45 gallon tank set up with lye and am cleaning up my 1940 Farmall A parts.

My advise is to use a stainless steel electrode.

George from Alberta

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Hendrik

02-26-2003 00:53:31




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
Electrolysis is used by many, it seems. Thank you all for your comments. Will work on the paint removal, anode surface area and temperature (of which I had no clue) ideas.



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F-I-T

02-25-2003 12:27:45




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
Hendrick:

As the others have said, the paint is an insulator, so it will not "pick up speed" until it has worked for a while. Also, the temperature of the solution will affect the reaction speed.

The only way for the washing soda to lift the paint is by those small bubbles of hydrogen lifting the edge of the paint film as it goes. If you want the reaction to gos a bit faster, use Sodium Hydroxide (Lye) instead of or along with the Washing Soda. The lye is a little nastier on your hands, but it really does the job on grease, oil and paint by emuldifying it so it will lift off faster.

I generally use lye all the time in my tank.

Frank-in-Tallahassee
70D // 855

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F-I-T

02-25-2003 12:23:14




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
Hendrick:

As the others have said, the paint is an insulator, so it will not "pick up speed" until it has worked for a while. Also, the temperature of the solution will affect the reaction speed.

The only way for the washing soda to lift the paint is by those small bubbles of hydrogen lifting the edge of the paint film as it goes. If you want the reaction to gos a bit faster, use Sodium Hydroxide (Lye) instead of or along with the Washing Soda. The lye is a little nastier on your hands, but it really does the job on grease, oil and paint by emuldifying it so it will lift off faster.

I generally use lye all the time in my tank.

Frank-in-Tallahassee
70D // 855

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Dansen in Ohio

02-25-2003 06:14:34




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
As mentioned by the others so far, lots of factors affect the process: 1. be sure you are using washing soda, not baking soda 2. the more and larger the anodes, the better 3. make sure the connections are good (the foam you see indicates so) 4. the warmer the temperature, the faster the process 5. it lifts paint well only if it is old, might take several iterations with good hard paint (you might consider using Easy-Off to get the paint off first). Even then it is a real slow process, an over-night type of thing. I end up doing it twice on most parts, washing off the residue with a Brillo pad each time. It is slow, but it works, it is cheap, and it does not take off good metal.

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Poor Farm Jim

02-24-2003 15:43:32




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
Hendrik,

Rhouston and big fred gave you good advise. Another thing to consider is the outside temperature, it was only 8 degrees here today, so if you are doing that where it is realatively cold it will slow down the process.

Jim



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rhouston

02-24-2003 10:28:05




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 Re: Electrolysis, what's wrong? in reply to Hendrik, 02-24-2003 06:39:07  
a larger anode would be in order. I've used steel screen around the out side of an empty drywall bucket. also check your connections. Remember that this is a line of sight thing between the anode and your part. Pieces facing away from the anode will de-rust much slower than those facing the anode. The white foam is a good sign.



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big fred

02-24-2003 13:43:01




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 Re: Re: Electrolysis, what's wrong? in reply to rhouston, 02-24-2003 10:28:05  
Also if the part is painted, you will not get much current draw. The process is mainly used for removing rust, not for removing paint. If you need to remove paint, try soaking the part in brake fluid if it's a small part. I keep a coffee can full of old brake fluid for this purpose. Put a painted part in there overnight and the paint is loose enough to wipe off by morning.



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big fred

02-24-2003 13:40:01




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 Re: Re: Electrolysis, what's wrong? in reply to rhouston, 02-24-2003 10:28:05  
Also if the part is painted, you will not get much current draw. The process is mainly used for removing rust, not for removing paint. If you need to remove paint, try soaking the part in brake fluid if it's a small part. I keep a coffee can full of old brake fluid for this purpose. Put a painted part in there overnight and the paint is loose enough to wipe off by morning.



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