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RE: Aluminum Base Plate

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When you look on a galvanic series, stainless steel is less positive than
other alloy steels but it is still more positive than aluminum. Stainless
steel could eventally cause aluminum to corrode though the process may be
slower than other steels.

Zinc is as low as you go on a galvanic series.  It seems hot-dipped
galvanized zinc bolts would be the better because the zinc would get eaten
by the steel and the aluminum. The best solution would be a complete
separation of the metals.  

It seems a pad under the plate would keep the water from getting under the
baseplate and being a bridge between the aluminum base plate and the bolts.


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: Dan Goodrich [mailto:dang(--nospam--at)karren.com]
Sent: Friday, April 27, 2001 12:02 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Aluminum Base Plate


I agree with Forrest.  I had a similar situation where the
aluminum supplier told me to put a TYP645 Bitumastic
pad between the concrete and the plate also.  Not sure
what that is though.  We used stainless steel bolts

Dan Goodrich, P.E.

----- Original Message -----
From: "Forrest Braun" <fbraun(--nospam--at)bbfm.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, April 27, 2001 2:52 PM
Subject: Re: Aluminum Base Plate


> Yes, corrosion is a major concern with the connection of aluminum and
> steel.  If the bolts are regular steel bolts provide a dielectric
> material material such as a plastic sleeve and washer between the two to
> completely separate them.  For a handrail condition this may not be the
> best choice.  Other options are available to achieve the separation.
> The other options are to use stainless steel or galvanized bolts.  The
> choice here will be the environment where the railing will be used.  A
> wet corrosive atmosphere says stainless.  A dry one says galvanized.
> Review "Aluminum Structures, A guide to Their Specification and Design"
> by Kissell and Ferry for example.
>
> Todd Hill wrote:
> >
> > 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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> --
> ++++++++++++++++++++++++++
> Forrest T. Braun, P.E.
> BBFM Engineers, Inc.
> Ph (907)274-2236
> Fx (907)274-2520
> Anchorage, Alaska
> http://www.bbfm.com
> ++++++++++++++++++++++++++
>
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