From: Paul Farber (farber@f-tech.net)
Date: Thu Sep 30 2004 - 15:38:15 PDT
DDoyle9570@aol.com wrote:
>Paul Farber wrote:
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>>Parts are not designed with 'extra metal' to overcome corrosion
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>That is 100% accurate....most items are built with a safety factor to compensate for all manner of extraordinary circumstances, ranging from rust, to overloading, to temperature extremes.
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>But I find it extremely interesting that you change positions on discussions at the drop of a hat. A few hours ago, your position was blast or dip away, that neither could possibly affect the integrity of a metal part. Now you seem to be saying that these same parts are so precisely engineered that any rust would unacceptably degrade performance.
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>Then you post that an alkali solution can't harm metal. Lets see, this thread began with a fellow's problems cleaning light metal parts. Tell you what, take the winch housing of a deuce, or the air intake bracket on a Multifuel truck, and put it in a caustic bath--by definition an alkali. Leave it overnight....after all, the all-knowing Farber says it won't hurt it...tell us all what you find in the morning.
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>I think that the real circumstances are that you are prepared to argue either side of the issue, without benefit of facts nor research, if this means you will see your name on the internet.
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>Rude, and not caring.
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>David Doyle
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I don't think I'm jumping around.
What have I changed my position on? I said that I would like to see
proof of springs (big, little) being embrittled due to cleaning.
Someone said he dipped a small sping in hydrocloric acid to clean it.
Why? Rust is safely removed with phosphoric acid and MUCH MORE SAFLY
with electrolytic rust removal. Dipping small parts in acid is not what
I believe most mechanics do to clean rust. You could media clean them..
but using the wrong media, pressure, technique can damge the part more
than the work hardeneing. If the spring was dirty kerosene is probibly
the beast dirt/grime removal solution.
Lots of others chimed in with this and that.. general noise when
everyone has an answer.
I never said embrittlement doesn't happen (reread my post) I just asked
ON OUR LEVEL (ie MV repair/ownership) that it doesn't. THe majority of
ebrittlment info I dug up (and I've had this discussion elsewhere) is
that high stress parts, electroplated parts ARE susecptible (sp?) but no
much that the average mechanic does falls into either of those two
catagories.
Hope that cleared it up few ya.
Now do you have any proof that it happened to you???? Not a story of a
guy that had a truck etc... but a failure directly related to embrittlment?
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