LumberJocks

1966 Unisaw Refub #4: Rust removal...Go!

  • Advertise with us
Blog entry by jbswearingen posted 769 days ago 1418 reads 1 time favorited 7 comments Add to Favorites Watch
« Part 3: Initial condition pics and disassembly has begun! Part 4 of 1966 Unisaw Refub series Part 5: Electrolysis really works! »

I’m trying my hand at rust removal with electrolysis for the first time, and so far, it looks good. I’m using my 10A battery charger, two pieces of 1/2×18” rebar, 12AWG wire, a plastic tub that is just a bit too small, and washing soda.

An hour and a half in, and there is already rust floating on the surface and a steady stream of O2 and H2 bubbles coming off the rebar pieces.

I’ll put more pics up as it progresses. I’m hoping to get the base finished and primered this weekend.

Update….

After about 18 hours of sitting, there is a noticeable difference. The electrolysis had stopped working (or had slowed so much it wasn’t visible) because the rebar pieces were covered in rust. I was working conservatively, so I only used two pieces and the water level was low. To speed things up, I’ve filled the container further and added three more pieces of rebar. I also pulled the two original pieces, and under running water, scrubbed them with a steel brush to “refresh” them.

Started it back up and the bubbles started flowing again.

Before and after:

The black is fresh, clean cast iron:

Ugly stuff, ain’t it?

-- Semper fi, Brad



7 comments so far

View Beginningwoodworker's profile

Beginningwoodworker

13337 posts in 2298 days


#1 posted 768 days ago

Great start!

-- CJIII Future cabinetmaker

View DocK16's profile

DocK16

1139 posts in 2712 days


#2 posted 768 days ago

Polarity: pos to the item you want derusted and neg to the rebar post?

-- Common sense is so rare anymore when you do see it, it looks like pure genius.

View jbswearingen's profile

jbswearingen

87 posts in 785 days


#3 posted 768 days ago

Yup. The rust is “pulled” from the negative side (the base) and deposited on the positive side (in this case, the rebar).

-- Semper fi, Brad

View jbswearingen's profile

jbswearingen

87 posts in 785 days


#4 posted 764 days ago

Quick update—

The base is done with the electrolysis. I scrubbed it with a wire brush and lots of water to remove any residue, let it dry, and then hit it with Rustoleum rust primer to kill any that I might have missed. Working on the motor cover now.

One rail is done, too.

-- Semper fi, Brad

View jbswearingen's profile

jbswearingen

87 posts in 785 days


#5 posted 763 days ago

Dock—

I made a mistake; you have the polarity swapped. You want the positive (black) on the item to be “derusted” and negative (red) on the rebar/sacrificial metal side.

-- Semper fi, Brad

View OnlyJustME's profile

OnlyJustME

1562 posts in 1002 days


#6 posted 726 days ago

I thought red was always positive and black was always ground or negative.
Haven’t tried electrolysis yet but have a bandsaw table that needs some attention and have been reading up on it.

-- In the end, when your life flashes before your eyes, will you like what you see?

View jbswearingen's profile

jbswearingen

87 posts in 785 days


#7 posted 726 days ago

Well, by labeling, the red is positive. Though electrically, it’s the point that is negatively charged, as it’s where the electrons “flow” from.

-- Semper fi, Brad

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase