Finally I turn my attention to the main cabinet. The initial condition is bad but not terrible. The paint was in bad shape. Much of the cabinet had surface rust. The bottom was heavily rusted inside and out. Fortunately it still structurally sound, the walls are not rusted through.
The first step was to pressure wash it. I spray degreaser on the drawer tracks. Scrubbed a little then let it have it with the pressure washer. I was hoping the high pressure water would magically rip the old paint off. No such luck. Clean but very little of the paint came off and none of the rust.
I thought for a long time on how to clean this up. Paint stripper and sanding would work well on the outside but the drawer tracks would be a problem. Also, it would not really get rid of the rust. Electrolysis would be nice but I did not have container big enough. Buying a big container is expensive and storage becomes an issue.
The best I had was a little kiddie pool long ago used by my kids and now used by my black labrador retriever. I could do a side at a time. Six sides would not take that long.
Here is the initial set up.
Put a steel plate on the bottom. Put the cabinet up on bricks. Put another plate inside on little blocks.
The plan quickly fell apart.
There is some limit to the total surface area. With too much surface area the current on the battery charger goes really high. The electrolysis hardly works at all. The same thing can happen when the plate and piece are close together. Here I had both. Two big plates both close to the cabinet. It worked OK if I removed the plate inside. Suddenly my six steps became 12. Still I let it run for 24 hours and checked out the results. The rust was gone. Most of the paint was loose. Scrubbing SOS and scotchbrite pads got it pretty clean.
Back into the electrolysis to work on the bottom inside. 24 hours later and lots of scrubbing resulted in this.
Almost all the paint is gone. All the rust is gone, although some changed to black iron. Black iron is softer than steel. It does not really hurt. You can paint over it without worry.
At this point the process was becoming a pain. The cycle is:
* Electrolysis for 24 hours.
* Scrub the last little bits of paint off and some of the black iron.
* Hose it down.
* Move the box inside the house to dry off. In the cleaning the already stripped areas were getting wet. If just left that way surface rust would form. So after each cleaning I would dry the box and leave inside for a few hours by a fan to get completely dry.
* Repeat.
After the bottom, I worked on the inside where the drawer slides are. Slow going. 95% of the paint was gone with electrolysis. The last 5% took a lot of time. For one side I tried leaving it in the pool for 36 hours. Did not work so well. If left too long the old paint sort of dries out and resticks to the piece. It comes off with scrubbing but it is easier to take off after 24 hours.
Some of the corners still had paint in them. After a dry cycle I shot it with a soda blaster. Worked great at getting the last little bits off very quickly.
Here is a picture of the drying stage.
To complicate the process the kiddie pool sprung a leak. Overnight about half the pool would empty. I drained and cleaned the pool then fitted the inside with some 6-mil plastic I got in the Home Depot paint department. The plastic worked for a couple of cycles then that too started leaking, only much slower.
Conclusions
Cleaning a large piece by electrolysis is possible but not easy. Lack of a big pool required doing the part in little sections. The relatively low power of my battery charger further reduces the size of the sections. The already cleaned/stripped sections getting wet requires thoroughly drying the piece between cycles.
Fortunately the end results are good. All the rust is gone. The paint is cleaned off with some scrubbing.
So far I have done the top and bottom and the insides. Over the next few days I'll clean the outside. More pictures when it happens.
Thanks for reading.