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Thread: slowing and or stopping rust
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17th July 2008, 01:49 PM #1
slowing and or stopping rust
Hi metal heads
I have to attempt to repair a steel frame that covers a pool. The frame consists of 24 4" steel posts sitting on concrete pads. Each post has a 1/2" thick steel plate welded to the bottom that are bolted to the concrete pads. They're starting to rust and I need to slow or stop it.
What do you guys think of this possible solution. Do you have any other suggestions.
I was thinking of attacking the rust with an acid to convert it and then paint on a heavy coat of rust kill (zink paint) and then seal them in a good quality paint.
As an added feature to slow the rust I was thinking of the sacrifical anodes that they put on boats. I thought maybe boltng one at the base of each post maybe a good way of keeping the rust at bay also.
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17th July 2008, 01:57 PM #2
Both those might work. I'd try to lift the posts, clean all around with a wire wheel on an angle grinder, then paint with a moisture curing polyurethane like POR13.
The trouble with an anode is it works like a battery and thus need a circuit. On a boat it's easy as the salt water flows all around, with galvanising it's easy because the zinc is all over the surface. With a discreet anode on a post in air it may or may not work.
I think you would do better cleaning down loose rust, using a rust converter and then a zinc rich primer.
2c.I'm just a startled bunny in the headlights of life. L.J. Young.
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17th July 2008, 05:16 PM #3Senior Member
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toolin,
hammerite is the answer to your problem, I used it on ungalvanised security grilles and have not had any rust appear after 3 years.
The australian distributor is a good bloke and he will despatch it next day. dont worry too much about the xylene based thinners, any paint store will supply you with a suitable solvent.
He is not a rel. or even a friend and I am not connected in any way, except as an occasional customer.
regards,
joe
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17th July 2008, 05:42 PM #4
I'll give that a go - cheers
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17th July 2008, 09:15 PM #5
Hi
Something that was worked very well for me is insulating the steel. In my case I had a steel frame screwed to a copper arsenic treted pine batten fence.It rusted like blazes even with paint on it. I have no doubt that was electrolytic corrosion was the prime cause of the rust.
I placed some plastic insulators ( actually scrap acrylic from school) under the base plate and re screwed the lot with 316 stainless steel.
From that time the rust was stopped in its tracks.
I can't guarantee it would work in the pool area but it should be cost effective to give it a go.
Cheers
Grahame
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17th July 2008, 10:51 PM #6
Ymmv
Re the remarks that suggested placing plates of acrylic under the posts send me a pm if you live somewhere near Canberra I may have access to some acrylic to do that job, I have a contact where I can get pieces.
Peter
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17th July 2008, 11:01 PM #7Senior Member
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MY vote goes with POR15 great stuff not cheap but brilliant.
I would remove the posts and grind/wire brush off as much rust as possible, treat them with POR then paint them (POR is not UV stable) and away you go.
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18th July 2008, 12:02 AM #8
I have been happy in the past with a rust converter on first and then a coat of hammerite.For me this has worked and worked well. Thanks for listening Matt
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