[Boatanchors] Rust, Coatings, etc.

[J. Forster]

It stays on until there is a booboo, then the surface heals. In the
healing process it bleeds more.

It's basically a self-healing surface, like aluminum.

-John

=================


> The problem with rust is that it is not a tightly adhering surface and
> will scale off exposing a fresh surface to start further rusting. The
> surface of Cor-Ten formed on weathering is tightly adhering and stops
> further rusting.
>
> David
> KW4DH
>
>
> On 4/7/2013 11:44 PM, Bill Carns wrote:
>> Certainly, and you have too. It is called Gun Blue. Gun Blue is nothing
>> more
>> or less than carefully applied rust - applied to a very well polished
>> surface in a very controlled way to produce a layer thickness that
>> refracts
>> light and makes it look Blue.
>>
>> Rust is a great passivation for steel and it is a very misunderstood
>> process
>> and situation.
>>
>> By the way, the US Navy uses Ospho on their rusty surfaces to terminate
>> the
>> rust process before they paint and it works well.
>>
>> The problem with rust is that if you try and paint over it without
>> terminating the oxidation process, then you get way worse pitting and
>> potential structural damage.  I use Ospho on my tower components and it
>> works very well.  I Ospho and then use a Zinc rich paint over that and
>> it
>> works well and holds up well.
>>
>> Bill
>>
>>
>
> --
> “One of the evils of democracy is, that you have to put up with the man
> you elect whether you want him or not.”  Will Rogers
>
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