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Zeno's Paradox lower bolt.  Notice the corrosion growth from 2007 to 2009.  Interesting thing is the last place to rust is right where the hammer pounded the bolt in.  I've noticed on Stainless bolts the only place that does rust is where the hammer hit it.  Strange.
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mschlocker
Jun 9, 2009
Zeno's Paradox lower bolt. Notice the corrosion growth from 2007 to 2009. Interesting thing is the last place to rust is right where the hammer pounded the bolt in. I've noticed on Stainless bolts the only place that does rust is where the hammer hit it. Strange.  
The reason your stainless bolts rust where the hammer hits it is that your hammer is carbon steel (with iron in it) and deposits a little bit of iron as it drives in the bolt. Aesthetically, it is unpleasing, but it is not a risk to further corrosion. I recently switched to a stainless hammer to avoid it, but it is overkill to do so.

http://www.sperkoengineering.com/html/Rust.pdf Feb 13, 2014

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