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Emile,
Yes, it seems to me that Hydrogen ingress is the
reason for the embrittlement. I didn't do a whole ton of researching "why"
it happened after conducting my experiments so I don't know for sure but in
asking guys who know more about it, the topic of Hydrogen ingress came up.
Again, once I concluded through my crude testing method that the plated part
broke before the unplated part, that was conclusive enough for me. I
conducted the experiment 5 times. All five times, the chrome plated 1"
round stock broke before the unplated one. In this experiment, I put a
slight bend in the metal pieces before putting them in the 20 ton press so that
they would bend in the direction I wanted them to.
As for the motorcycles, if the piece is part of
the structural integrity of the bike (eg frame, wheel, forks, etc) it is very
likely (I've never seen one that wasn't) that it is polished aluminum, or
some other polished surface, and not actually chrome plated.
Myles.
----- Original Message -----
Sent: Friday, November 11, 2005 2:10
PM
Subject: Re: [PSUBS-MAILIST] Stainless
hatch ring
Myles,
What is the mechanism of the embrittlement after chrome plating?
Hydrogen ingress?
I know anodising propagate "kerfwerking" (dont know the english
word), it has to do with a little notch that causes a crack, but that
does corrosion too.
About chrome and cruiser bikes: "it has to shine, it dont have to
work"
Regards emile
Gents,
The chrome plating process makes the
metal more brittle. Brittle in sub = bad. Save the shiny stuff
for other things.
Myles.
----- Original Message -----
Sent: Thursday, November 10, 2005
3:17 PM
Subject: Re: [PSUBS-MAILIST]
Stainless hatch ring
brian how about just plate the ring with
chrome.
rick m
----- Original Message -----
Sent: Thursday, November 10, 2005
12:59 PM
Subject: RE: [PSUBS-MAILIST]
Stainless hatch ring
Brian,
I think you're fine as is. The one
that's really nice to have in stainless is the ring that your hatch
lands on, because in getting in and out you scratch tha paint very
easily there. But that said, all the home built subs I've seen so far
have steel lands due to the cost of a large stainless ring. The "pro"
subs have SS there, we just repaint.
rgds,
Alec
When I put together my domed hatch ( in my machining class)
I first had the hemisphere fabricated and then I had a 2" ring welded
to the edge of the hemisphere. At the time I
was not really clear on how everything was going to come together
and now in hind sight I realize that the 2" ring that I welded on
should have been stainless steel instead of what I used.
My question is, can I fabricate a stainless ring
and connect it to what I have now ? I could remove
some of that material ( the ring part ) which is 3/4" thick so as
to reduce the weight. I'm afraid if I don't make that ring part
thinner the hatch will be too dam heavy.
If I do add this new stainless ring should I just weld it to the
existing ring? and then put it in a giant lathe and machine it
true?
Here is a picture of the hatch cover:
Thanks
Brian
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