[Diy_efi] H2 embrittlement (was Re: Is E85 worth it?)

[David Dowell]

H2 embrittlement does not require IONIZED H2. It occurs at room
temperatures with HIGH strength steels. In fact, it is at it?s worst at
about room temperature and decreases as the temperature rises until
you get to about 175 degrees F, above which embrittlement no longer
occurs. Like I said, it occurs in HIGH strength steels. If you keep
the yield strength of the steel to 80,000 psi or less, embrittlement is not
a problem. So?. How do you build an H2 container that will stay
together and not break? You build it with steel of 80,000 psi yield
strength or less. H2 will not "work" it way through steel and "leak" but
because it is a VERY small atom, it will find it's way out of other forms of
containers that normally will hold air. Rubber, generally will not 
control H2.
You r kids fair balloons is an example.



Phil Hunter wrote:
> "Regular" hydrogen does NOT cause embrittlement, it's IONIZED
> H2 that does, like you can get when welding wet metal, chrome
> plating, and in nuclear power plants. I've said this before,
> I have a steel welding tank of H2, first inspection date I
> can see is 1957, making the tank 50ish years old. If H2 caused
> embrittlement, then why do they keep STAMPING the inspection
> dates into the tank?!? There are tanks out there over 100
> years old, still in regular service.
>
> Same tank, I haven't used it for over a year, I could not
> discern any loss in pressure. Yep, H2 leaks out of anything,
> given enough time. I'm just SO worried about that, I'm shakin'
> in my boots.
>
> The pressure regulator is specific for H2, uses a metal diaphram.
>
> -phil
> (digest)
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