From: Paul Farber (farber@f-tech.net)
Date: Mon Sep 27 2004 - 22:01:45 PDT
Douglas Greville wrote:
>>>>I quite often put rusty STEEL parts in muriatic to
>>>>
>>>>
>-snip-
>
>
>>and a real mess. BTW, hydrogen is released and is flammable and
>>even explosive.
>>
>>
>
>AND!!!!! the released hydrogen is absorbed into the steel and will
>cause "hydrogen embrittlement". So just think again about what parts
>you have treated in this way.
>Nothing to do with steering or brakes I would hope?
>
>Or for that matter wheel nuts, seat and seat belt mountings, drive
>shaft flange bolts and nuts etc.................?
>
>My experience is that any acid treatment is a bad idea unless done
>under controlled condtions. Which is not practical for most of us.
>
>I also note that sprind steel hates acid, you end up with honeycomb.
>
>Regards
>Doug
>
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>
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>
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>
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>
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How long do you need to soak parts before the embrittlement occurs?
I've left high strees parts sit overnight (days even) in phosphoric
acid, and none of the nuts/bolts/brackets have failed. Probibly the
most stressed part is a jeep lower shock mount... the one that sits
under the springs, clamped to them by u-bolts, with the axel on top.
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