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RE: Aluminum Base Plate

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The steel bolts will not corrode if connected to aluminum.  The aluminum has
electrons it can donate and could possibly act like a sacrificial anode if a
salt bridge is present.  If you have a "Handbook of Chemistry and Physics"
or something along those lines you look up a table with "reduction
potentials".  The metal that has a more positive electromotive force
potential will recieve the electrons and not corrode.

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division http://www.muni.org/building
Development Services Department
Municipality of Anchorage
phone:907-343-8183  fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us



-----Original Message-----
From: Todd Hill [mailto:thill(--nospam--at)tkarch.com]
Sent: Friday, April 27, 2001 11:37 AM
To: SEAINT (E-mail)
Subject: Aluminum Base Plate


I need to place an aluminum base plate (handrail) on top of an elevated
slab.
I'm using steel "thru" bolts to tie the base plate to the lightweight
concrete surface and connecting to a steel plate below.
1. Is corrosion a major concern for this type of connection?
2. Is there a washer/bushing type of material to create a barrier between
the steel bolt and the aluminum base plate?
TIA.


Todd Hill, P.E.
TK Architects, Inc.
816-842-7552 ext. 233


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