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  #51  
Old 11-08-2019, 01:04 AM
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Well gee, Johnny. I don't know what to say about these laggards not replying to your question and you know I can't answer you because I am disqualified from anything with the word "paint" in it because I don't.
And because I always just use electrolysis, not phosphoric acid.
Maybe somebody will remember his manners soon.
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  #52  
Old 11-08-2019, 03:54 AM
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There's loads of time yet, wont be washing till tomorrow


Tried the electrolysis once and liked it, but it would be a hell of a tank to hold this trailer
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  #53  
Old 11-08-2019, 09:51 AM
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There's loads of time yet, wont be washing till tomorrow


Tried the electrolysis once and liked it, but it would be a hell of a tank to hold this trailer
Somewhere in here is a setup for electrolysis on a trailer frame that Terry Lingle did. He made a tank out of plastic sheet with a wood frame high enough to let water cover the frame.
Used a welder to power the action.
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  #54  
Old 11-08-2019, 09:58 AM
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would be a big tank
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  #55  
Old 11-08-2019, 11:29 AM
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would be a big tank
Yep. I'm assuming you would remove springs and axle first. I sure would not bother to paint springs or axle.
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  #56  
Old 11-08-2019, 12:25 PM
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For the phospho experts.



How long should I leave it on? lets assume 20% acid mix, sprayed on with a garden sprayer.



Should I spray it on, leave it dry and paint later that day, or spray it on, wait X hours, wash it again and then paint once dry.



Doing it this weekend.


The Osphos I used recommended spray / brush it on, let dry overnight, and paint over in morning after dry. YRMV depending on the weather/ or where you are painting it. (Inside or out?)




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  #57  
Old 11-08-2019, 12:48 PM
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Search for Bill Dickerson He did a complete write up on the set up.
At the same time I tore down the old 16 X 72 metal lathe that sits along one wall of my shop and ran it through the tank When I was finnished I syphoned the soapy water out and was left with about three 45 gallon drums of black residue that I dumped in a low unused back corner of my property.
It is about the same residue that you would get if you washed a lot of mechanics coveralls
The result of this dump was a few years of better grass than the rest of the area.

At the same time I had a second smaller tank running to process the small parts. about 3 am I got woken up by what sounded like a local thunderstorm.

The small parts tank was in thermal run away. As the liquid got hotter it became more conductive more current generated more heat and caused more water to decompose into hydrogen and oxygen.
when the water started to boil the suspended parts started moving and touching the other side of the grid. The resulting sparks set of the hydrogen bubbles in the oxygen enriched volume at the top of the tank.

The cause was using a 5 KVA 36 volt transformer and pushing the tank too hard.
The main tank was running at about 80% of the 100% duty cycle currrent of my dial arc which was protected by a circuit breaker to keep it inside the safe operating area.
The big tank temerature never got more than ten degrees above ambient.
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  #58  
Old 11-08-2019, 12:59 PM
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Originally Posted by cutter View Post
Well gee, Johnny. I don't know what to say about these laggards not replying to your question and you know

Maybe somebody will remember his manners soon.
I think the answer is in post 45, 10/21/19

I would try a small area first an wait and see if it will flash rust an hour or two. I used store bought metal-prep and had flash rusting when "washed off".
ended up just wiping it off with a rag (wear gloves don't inhale)

The stuff I had also had Diethylene Glycol Monobutyl Ether.
it left a white film.
After it was dry hour or two it did not flash rust had it outside for a week.

I primered after a week, never got a chance to paint it lasted about 20 years with primer.


**
Shade
what would happen if Glyco (some antifreeze 1:20) was added to the acid
would its film prevent flash rusting once dry?

I recall some where stating it may may not rust for months un-painted
there was a definite film when it air dried.

I don't think you can buy this stuff any more. CHEMFIL DX579
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