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Re: Aluminum girts and stainless steel screws

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In a message dated 12/21/2004 7:42:05 PM Eastern Standard Time, kieranks(--nospam--at)gmail.com writes:
FWIW, my Aluminum Design Manual from The Aluminum Association requires that steel surfaces in contact with uncoated aluminum be painted to prevent direct contact between the metals.  It specifically excludes Aluminized, hot dip or electro- galvanized steel and 300 series stainless steel from this requirement, unless in a high chloride environment.  (Ref. Part 1A, Sec. 6.6.1 "Contact With Dissimilar Metals")

Kieran
 
There are probably stainless steels other than the 300 series that wouldn't have to be painted.  For example,
 
904L -  Much higher resistance to chlorides at elevated temperatures than 316, with good formability

2205-  Much higher resistance to chlorides at elevated temperatures, and higher strength than 316
However, 316 is usually regarded as the standard “marine grade stainless steel”.
Gail Kelley