Front Office wrote:
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


In a marine environment, the aluminum will go more quickly.

The ADAMS-class DDG and the FFs made during the 1960s had aluminum---or
should I say, al-loo-min-ee-um?-- bolted to a steel plate with a special
sort of bolt called a Huck bolt. They all experienced corrosion of the
aluminum. (black electrical tape separated the two metals.)

The TICONDROGA and SPRUANCE class ships had aluminum superstructures
which were welded to a "fusion bar" which consisted of a piece of very
clean and smoothly-machined piece of aluminum FLAT BAR joined to a very
clean piece and smoothly machined piece of steel flat bar via explosive
charges.


M.S.