[ARC5] Evapa-Rust Report

[Bruce Long]

By the way, I find it useful to use a plastic bag for this purpose, 
since suitable containers to enable total immersion of the item often 
are not available without buying huge quantities of Evapa-Rust.

I had a similar problem using acetone to dissolve the super glue I had used to glue a large number of ferrite bars together.  To enable total immersion of the glued ferrite assembly without using a large amount of acetone, I first bought a ten gallon metal lard can which has an air tight lid at the local hardware store.  It might help to live in the country, city hardware stores, even those in the same hardware store chain don't seem to carry lard cans.

I put the glued ferrite bars in the lard can then filled the remainder of the can with children's sand box sand which filled up almost all of the unused can volume.  Then I added about a quart of acetone which wetted the voids between the sand grains and put the lid on the lard can.  


The next day i took off the lid and the ferrite bars fell apart easily.  I let the can open overnight to evaporate the acetone and i was done.

Rather I thought I was done.  This was a work project, I was prototyping ferrite loaded air core transformers for wireless resonant inductive charging of a shuttle bus and the project was funded by the state environmental protection agency.

Turns out i had to invest the better part of an afternoon writing a report to be submitted to the state auditors on why I bought a lard can and a fifty pound bag of sandbox sand and charged these items to the state while working on an alternative energy/engineering project.

Sometimes it does not pay to be clever.




On Wednesday, November 13, 2013 5:40 PM, Robert Eleazer <releazer at earthlink.net> wrote:
 
Some months back I asked here about what might clean up the extensive corrosion on the tuning cap of a National NC-270 I had purchased.  I think it was Ken that recommended a product I had never heard of, Evapa-Rust.

I ended up buying 4 quarts of Evapa-Rust and used it on some parts for my airplane and a few other items.  I found it worked quite well, but often required at least 24-48 hours or more to get the job done.

I finally got around to pulling the tuning cap from the NC-270 last week.  I had purchased a replacement but decided to try the Evapa-Rust on the old one.  I dropped the tuning cap in a container of the Evapa-Rust and waited.  By the way, I find it useful to use a plastic bag for this purpose, since suitable containers to enable total immersion of the item often are not available without buying huge quantities of Evapa-Rust.

After 48 hours the cap looked better but still had a ways to go - rust was visible on the frame and heavy corrosion still was on the shaft.  But 24 hours later there was a definite improvement.  And 48 hours after that the cap looked very good indeed, with still some corrosion on the worst parts of the shaft.

I rinsed the cap, brushed away at the worst corrosion on the shaft and put it back in the Evapa-Rust for another day or so.

The Evapa-Rust I am using has seen extensive use and is quite dark but it still worked.  I think that removing the item and rinsing it off after 24 hours is probably a good idea, enabling the Evapa-Rust to get to the most severe corrosion if you need to continue with the soaking.  Merely taking the cap out after the first 48 hours and accidentally wiping off some of the crud with my hands probably is the reason there was such an improvement for the 24 hours following the first 48.  

Anyway, it's great stuff!

Wayne                
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