Re: A SURE WAY TO REMOVE FLAKY RUST FROM EXHAUST MANIFOLDS AND BRAKE DRUMS

Posted by Carl on April 22, 2000 at 16:29:54 from (63.209.127.6):

In Reply to: A SURE WAY TO REMOVE FLAKY RUST FROM EXHAUST MANIFOLDS AND BRAKE DRUMS posted by Ken McWilliams on July 21, 1998 at 09:50:41:

I see it's been a while since the original message was posted but Re: soaking metal parts in an acid solution, you need to be aware of a consideration known as hydrogen embrittlement that occurs to metal parts. The metal can be weakened by a chemical change that occurs when soaked in acid, and this can pose a very real hazard in the case of certain load bearing parts - suspension, brakes etc. I don't know if the 4:1 dilution you mentioned would prevent this or not. I'm not sure who you would contact regarding this, but I would ask someone who REALLY knows their stuff in relation to metallurgy, chemistry etc. before dunking any parts like that to find out about this potential hazard.

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