BE CAREFUL! It only takes a tenth of a milliamp to stop the human heart no matter how low the voltage is. There is quite a bit of info on the internet about it try googlin or yahooing it up as washing soda rust removal. Any aluminum, plating, or electricly drawn coating will be gone. DON'T get your polarities mixed up or your going to desolve your part and not your sacrificial metal or let the part and your anode touch.
![etank 12v transformer rust removal etank 12v transformer rust removal](https://images-na.ssl-images-amazon.com/images/I/31w3aJ6HksL._AC_.jpg)
Make sure that your bucket or tank isn't made or lined with metal. Be sure make sure you have good connections or it won't work it will have tinny little bubbles coming out of the rust as it starts. It didn't break down the good metal at all even after a week. I decide that it works great and ran another test to see what would happen if it got forgotten for a hour then a day then a week. I sturred it around the bucket and all the rust rinsed off even all that was in the deep pits. 10 minutes later I turned the charger off and looked inside the bucket and I still saw rust metal although some was sitting in the bottom of the bucket. Hooked everything up turn my battery charger to 2 amp trickle and walked away. I had already made my replacement so I used it as a test piece. It was a left over piece very rusted to the point it had the strength of foil and pin holed everywhere. I tried the soda ash (washing soda) method a couple years ago on a part from my 29 chevy. This process actually works great museums have been doing this for decades to restore most metal items as it will only remove rust and not good metal like sand and bead blasting or what happens when parts are left in molasis or coka cola to long and you can't find it anymore.
![etank 12v transformer rust removal etank 12v transformer rust removal](https://live.staticflickr.com/65535/49684633466_9f272a3f9d_c.jpg)
![etank 12v transformer rust removal etank 12v transformer rust removal](https://www.qsl.net/2e0waw/rust/circuit.gif)
Washing soda is also known as soda ash available at swimming pool supply places.