[Vwdiesel] Rabbit droppings # 160 --- ( Hagar on the SENILE virus ).

[gary]

We were taught this in Naval Nuclear Power School.

Specifically, the Zirconium that made up the fuel matrix of the fuel
cells. The fear was H2 embrittlement of the fuel cells making them prone
to fracture.

I can't believe I still remember this tripe.

-Gary, 
ex-nuke


On Fri, 2005-05-27 at 01:10 -0600, James Hansen wrote:
> Gary, I've read about this being an issue on reactors.  Is that only
> theoretical, or was there a TBO on reactor parts to address that?
> -james
> 
> -----Original Message-----
> From: gary [mailto:gbangs at cfl.rr.com]
> Sent: Thursday, May 26, 2005 4:19 PM
> To: James Hansen
> Cc: VWDiesel
> Subject: RE: [Vwdiesel] Rabbit droppings # 160 --- ( Hagar on the SENILE
> virus ).
> 
> 
> Here goes... H2 embrittlement
> 
> In metallic crystalline structures, think of a plate of marbles. All the
> marbles line up in neat rows of atoms. Now picture layer upon layer of
> the atoms. One layer easily glides along the surface of the next layer.
> 
> -> Metal bends easily and doesn't break.
> 
> Now, toss in a H atom.
> 
> The metal lattice structure basically stays the same, but now the H atom
> sits in-between the layers of metal atoms. Think of a door stop. One
> layer can no longer easily slide along the other layers.
> 
> -> The metal is much harder to bend, and will eventually break as the
> crystal lattice lets go.
> 
> 
> Does that answer the question?
> 
> -Gary
> 
> 
> On Thu, 2005-05-26 at 01:30 -0600, James Hansen wrote:
> >
> > And by the way  I am going to try and smoke our man of STEEL out of his
> > Canola patch
> > and explain ---HYDROGEN    imbrittlement of steel      ---jep James
> Hansen.
> >
> > -----------------------
> >
> > I wish he was out in the canola patch.  Had to tear down the fuel
> injection
> > system in the 450hp Cummins in the tractor, so unless I hitch a looooong
> > string of horses together, for now, not a whole lot of planting going on.
> > Should see some activity tomorrow afternoon.  So why does stuff always
> seem
> > to blow up on the friday night of the long weekend?  That's what I want to
> > know.
> > Hydrogen embrittlement.  Gee, Hagar, you're making me think, it's late.
> >
> > It's thought to cause stuff like bolt failures when using the shiny plated
> > bolts, and on chromed parts- the electroplating action causes hydrogen to
> be
> > absorbed by the metal, where it reacts with carbon in the metal grain
> > structure.  Methane gas is formed, so to fart, the metal has to break
> along
> > the grain boundaries.  Not great if it's a part you like, say on a wing,
> or
> > a wheel for instance.  Also corrosion can produce hydrogen with similar
> > effects, and welding. You have probably heard the term "low hydrogen
> filler
> > rod"  the welding filler rods are heated to drive any free hydrogen out so
> > as to not expose the weld surface to an embrittling agent.
> > I like teasing the shiny chrome engined weekend drag racer guys about
> > hydrogen embrittlement and electroplating.
> > -James
> >
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