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Bob
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Join Date: Apr 2006
Posts: 8

Fence Post Corrosion

05/21/2011 11:15 PM

I have a wire fense that uses used 2.5 inch oil pipe in the corners and gate supports. All were cleaned and painted. within 3 months, 3 of them were heavely corroded. Two of them are at a man gate (3 feet appart) and the other is at the opposite corner of the fense. These 3 were again scrapped,sanded, washed with a "metal prep" and repainted. Two months later, they are showing signes of overall corrosion again. All other posts are fine.

How do I stop this corrosion?.
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SimpleMind
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#1

Re: Fence post corrosion

05/22/2011 12:03 AM

Electrically isolate it either from ground of from the fence to stop electrolysis. You can't? (lol) I know you can't but you asked for it. S.M.

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Hendrik
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#2

Re: Fence post corrosion

05/22/2011 1:58 AM

Soil types may vary over short distances and you may have created a battery.

Would it not help to add a blob of aluminium to the problem poles?

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phoenix911
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#3
In reply to #2

Re: Fence post corrosion

05/22/2011 12:06 PM

GA

create an sacrificial anode. Just like on a boat.

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ky
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#4

Re: Fence Post Corrosion

05/22/2011 6:18 PM

Maybe set them in concrete and avoid contact with soil?

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WAWAUS
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#5

Re: Fence Post Corrosion

05/22/2011 11:53 PM

Simple solution - Maybe replace those two posts with concrete ones ....

Or to analyse it further .... if you have a multimeter? disconnect the wires from the posts and place the multimeter (set to first measure voltage and then current) between the post and the wires.

If you can measure anything you have a current flowing - and the next questions to address are why? and from where?
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rcrain
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#6

Re: Fence Post Corrosion

05/23/2011 3:19 AM

What we have done is we coat the bottom 24 inches of the post with tar, that has light lube oil mixed in it. You want to mix this very well, and put it on with a brush. Let it stand for a while and harden, then apply more coats. You may want to leave it overnight, or place it in a low heat oven. When your ready, place them into the ground. No more corrosion.

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Redman46
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#7
In reply to #6

Re: Fence Post Corrosion

05/23/2011 5:41 AM

You may just have acidic soil in several places in the pasture. Try good old pressure-treated wooden posts at those locations.
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EElectrician
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#8

Re: Fence Post Corrosion

05/23/2011 10:31 AM

Try painting the fence with aluminum asphalt paint:

http://www.farmpaint.com/product.php?productid=16145

The instructions suggest "wire-brushing" rusty spots, but you can paint right over the rust as long as it is not flaking off.

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morrie
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#9

Re: Fence Post Corrosion

05/25/2011 11:34 AM

All other posts are fine


What are the other posts?
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EElectrician
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#10
In reply to #9

Re: Fence Post Corrosion

10/17/2011 2:04 PM

Most likely the other [fence] posts are fine.

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Users who posted comments:

EElectrician (2); Hendrik (1); ky (1); morrie (1); phoenix911 (1); rcrain (1); Redman46 (1); SimpleMind (1); WAWAUS (1)

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