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RE: Steel corrosion

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To satisfy my curiosity, do you know what kind of paint was used on the one
bunker? It sounds like it did a pretty good job if there is no significant
corrosion after 50 years. 

> -----Original Message-----
> From: Jack Creviston [mailto:jcreviston(--nospam--at)tlf-engineers.com]
> Sent: Tuesday, April 17, 2001 9:01 AM
> To: 'seaint(--nospam--at)seaint.org'
> 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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