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Subject: Aluminum/Steel interaction in salty atmosphere.

Date: 07/31/00 at 5:42 PM
Posted by: Michael Painter
E-mail: tvhawaii@shaka.com
Message Posted:

Aloha

I have a customer with a 16 ft. Satellite dish. The expanded aluminum mesh is fastened to 24 ribs of extruded rectangular aluminum tubing with 1,190 steel self-drilling screws and then powder coated.
Is is in a location that gets the salt-laden atmosphere that blows in with the Trade winds and has corroded terribly in the areas where the screws touch the mesh. (What is the composition of that white, somewhat opaque, scale?)
The fastenings are ~8 inches apart. I was thinking of re-fastening the mesh by using 18-8 stainless self- drilling screws w/neoprene washers, and putting them in between the existing fastenings which would be removed after the mesh is secure.
I'd appreciate anyones thoughts on this.

Thanks,

Michael Painter
A/V Engineering of Hawaii


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