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Re: Steel corrosion

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I would think 0.01" is well within the tolerances of any steel mill, but i'm
not really all that crusty...

Alden Manipula
Structural E.I.T.
www.novagroupinc.net

----- Original Message -----
From: "Jack Creviston" <jcreviston(--nospam--at)tlf-engineers.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, April 17, 2001 10:00 AM
Subject: Steel corrosion


> I just finished one of those jobs that remind you why you spent all that
> time earning an education.  The only thing worse than foundry jobs: coal
> bunker inspections!  Both were built around 1951.  The steel in one bunker
> was never painted and is severely corroded (delaminated to less than 50%
of
> original cross section).  The other bunker was painted at one time and
> herein lies the mystery.  The steel was cleaned as aggressively as
possible
> and then measured with a micrometer.  My measurements are showing the
steel
> in be an average of 0.01" thicker than it was 50 years ago.  The steel had
a
> pitted appearance, which I attribute to the paint.  My question is: can
the
> paint, in this type of environment, "fuse" with the steel?  What I mean
is,
> can it become indistinguishable after so many years of acidic exposure?
> Could the extra material be the paint?
>
> The steel was all solid in this bunker, so my interest is more out of
> curiosity than concern.  I would appreciate any (readily available)
> references or even anecdotal evidence from some of you crustier (I mean
that
> with respect) participants.
>
> Thanks!
> Jack Creviston, EIT
>
>
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