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Posted by DerbyDad03 on October 11, 2008, 8:40 am
A question entered my mind as I was sprucing up my utility trailer. I
removed the strap hinges and closure brackets, etc. so I could clean off
the rust, re-paint, etc.
There are lots of mating surfaces where rust was present on both
surfaces, such as the back of the hinge plates and the trailer itself. I
started wondering what would happen if I used a wire wheel to get the
rust off one surface, but not the other. (That's not my plan, just my
thoughts as I was working.)
All other things being equal (weather, moisture, etc) as they would be,
does the mere presence of rust on one surface make the other surface
more apt to rust?
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Posted by dpb on October 11, 2008, 9:03 am
DerbyDad03 wrote:
...
show/hide quoted text
> All other things being equal (weather, moisture, etc) as they would be,
> does the mere presence of rust on one surface make the other surface
> more apt to rust?
No. If anything, the rusty surface will tend to inhibit or slow down
additional oxidation of the material as it tends to act as a barrier.
Cleaning the rust layer off exposes fresh material to be oxidized.
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Posted by aemeijers on October 11, 2008, 4:07 pm
dpb wrote:
show/hide quoted text
> DerbyDad03 wrote:
> ...
>> All other things being equal (weather, moisture, etc) as they would
>> be, does the mere presence of rust on one surface make the other
>> surface more apt to rust?
>
> No. If anything, the rusty surface will tend to inhibit or slow down
> additional oxidation of the material as it tends to act as a barrier.
> Cleaning the rust layer off exposes fresh material to be oxidized.
>
> --
Chuckle. Learned that the hard way a few times. Prep the metal one day,
get tired, figure I'll paint in the morning. Wrong. End up going over
the whole thing again, even though the flash of rust was paper-thin.
Rust Never Sleeps, indeed. Learned at a young age about waxing saw
blades and table saw beds. Not much sadder looking than a rusty table saw.
aem sends...
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Posted by dadiOH on October 11, 2008, 9:09 am
DerbyDad03 wrote:
show/hide quoted text
> A question entered my mind as I was sprucing up my utility trailer. I
> removed the strap hinges and closure brackets, etc. so I could clean
> off the rust, re-paint, etc.
> There are lots of mating surfaces where rust was present on both
> surfaces, such as the back of the hinge plates and the trailer
> itself. I started wondering what would happen if I used a wire wheel
> to get the rust off one surface, but not the other. (That's not my
> plan, just my thoughts as I was working.)
> All other things being equal (weather, moisture, etc) as they would
> be, does the mere presence of rust on one surface make the other
> surface more apt to rust?
There is nothing in rust - iron oxide - to cause iron to rust as it is
stable. However, rust is sort of porous and that means it could retain
moisture and *that* would cause rust in the unrusted and unprotected
surface.
--
dadiOH
____________________________
dadiOH's dandies v3.06...
...a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico
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Posted by Blattus Slafaly on October 11, 2008, 9:31 am
DerbyDad03 wrote:
show/hide quoted text
> A question entered my mind as I was sprucing up my utility trailer. I
> removed the strap hinges and closure brackets, etc. so I could clean off
> the rust, re-paint, etc.
>
> There are lots of mating surfaces where rust was present on both
> surfaces, such as the back of the hinge plates and the trailer itself. I
> started wondering what would happen if I used a wire wheel to get the
> rust off one surface, but not the other. (That's not my plan, just my
> thoughts as I was working.)
>
> All other things being equal (weather, moisture, etc) as they would be,
> does the mere presence of rust on one surface make the other surface
> more apt to rust?
Rust does protect metal and slows down oxidation but does not stop it.
It's powdery and falls off then more oxidation occurs plus it absorbs
water. Rust is the natural state of iron ore. Back in early earth
history before oxygen, metal was dissolved in the oceans. As plants
created oxygen all the metal rusted and fell out of the ocean into
concentration that are now our iron ore mines. It's similar to when
enclosed oceans dried up and left salt mines.
--
Blattus Slafaly ? 3 :) 7/8
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> does the mere presence of rust on one surface make the other surface
> more apt to rust?