"Front Office" wrote in message
. ..
I need to build a dozen outdoor canopies for an office building.
I want to use structural aluminum channel, bolted with steel bolts.

Where might expect corrosion to arise over the years, and would
it be mainly in the aluminum or in the steel bolts?

Thanks for any help.

Please post here or email me at grayscale[AT]verizon.net

Ralph

Ralph,
I'm 'going through' my 11 year old aluminum boat trailer right now which was
bolted together with galvanized bolts. I don't see the aluminum pitting I
would have expected around the bolt holes. I do have a few rusty bolts which
are easily replaced. I recommend you use this method. If you go with S/S
bolts you WILL have pitting around the aluminum holes (as the least noble
metal gets the damage) and it will not be easily repaired in the future.

Larry

My turbine powered boat project;
http://www.turbinefun.com