The Shop > Finishing

Rust Removal

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Andy:
This is brilliant Darren. I've been following this with interest. Cheap, easy, not much effort =  :D

When you said about using a larger container that most households have I thought you were going to suggest the bath for a minute...  :bugeye:

The only commercial product that I've had any real success with is Metal Ready. Far too expensive for big jobs though. Used it for de-rusting inside motorcycle fuel tanks.

Darren:
Thanks for the feedback guys, as many of you will know this is not a new idea by any means. There are quite a few pages on the net covering this.

This is an interesting one using a towel as Dave BC suggested earlier..http://madmodder.net/index.php?action=post;topic=1651.30;num_replies=35

David D...wot grass cuttings.....we have sheep around here ya know.... :lol:

Jonny, just what is this metal part at 11K......you might want to look up Hydrogen embrittlement before you give this a go. It really doesn't affect our parts, but if you are working with a "critical" part it may. It's not permanent though and can be eliminated my heating the part afterwards. It's to do with the hydrogen forming on the surface of the subject. Some also forms inside the metal and due to the hydrogen expansion it can put pressure on the part. Not to the point of actually breaking it, but it does reduce integrity to a small degree. Like I said it does subside as the hydrogen finds it's way out over time.

For our needs it is of no consequence.

Andy, yep Metal Ready is pretty good I agree. But to do this pillar drill would cost more than the drill is worth.



So a progress report, the contents of the bucket are fermenting nicely  :) The mobile charger is coping fine and the ma rose to 480ma as expected, prob due to the iron content of the water helping conductivity.
But it's a little on the slow side, prob due to the large size of the part and the low ma I guess. So I have changed to a charger giving 1.5A or 1,500ma output tonight and instantly the difference is obvious.






 

sbwhart:
Hi Darren interesting thread  :thumbup:. keen to see how your charger works out with it, I think i may rig a small bath up to do some old tools that could do with a de-rust

Have fun

Stew

Bluechip:
Crikey,this ones going on a bit .. :D

I wonder if my received wisdom to use a current limiter is relevant to the hydrogen embrittlement aspect.

Maybe the effect is much reduced or eliminated by a long soak at a very low current ?

Just a thought.

There are fairly large plastic box things in the DIY sheds from time to time. Cheapish.
The sort used to store toys etc. Focus have 'em anyway, although it's a year or so since I got one.

If everyone has a go at this the price of washing soda is going to jump in a bit, world shortage imminent ..  :D

Dave BC

Darren:
Stew,

Considering the main column casting has already been done once, and then put into this fresh solution then I believe the little phone charger is doing a grand job.. :thumbup:



However, the first charger I tried died after about 8hrs, the second is sill going strong after almost 30hrs. (I'm not ready to take it out just yet so I'm leaving it in there)
The difference between the chargers is that the one that died was an unregulated type, and the current one has a  regulated output. (This means it can't overload itself and thus burn out) This gets back to what David BC advised earlier with adding a car headlamp bulb in series to limit the current.  :thumbup:

In the other vat I removed and washed down the baseplate....one thing I have noticed about bare cast iron is that rust forms instantly without protection.



So I dried it with a powerful electric paint stripper, got my paint ready, wiped it over with some white spirit which removed the flash rust and painted it. I used poly floor paint with a touch of white spirit to thin it slightly to help with brush marks. You have to get on with it as floor paint dries pretty quickly.



This is just the first coat, it will have another tomorrow.


Onto the stand.
I wanted to reposition the wheels further back so fabricated some brackets on the mill.



Welded them in place and at the same time added a middle shelf from some old bed iron and a handle on the front to make moving it about easier and safer. All parts were de-rusted.
It may be interesting to note that the smaller parts took only an hour or so to de-rust.

The stand was then given it's first coat of paint with a small roller.

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