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

[James Hansen]

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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