Return-Path: Received: from king1.vineyard.net ([204.17.195.90]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-70783U4500L450S0V35) with ESMTP id com for ; Tue, 30 Jan 2001 23:35:43 -0500 Received: (from mail@localhost) by king1.vineyard.net (8.9.3/8.9.0) id XAA17567 for ; Tue, 30 Jan 2001 23:44:13 -0500 (EST) Received: from dsy1.vineyard.net(199.232.95.60) by K1.vineyard.net via smap/slg (V2.0) id sma017547; Tue Jan 30 23:43:58 2001 Message-Id: <200101310444.XAA17567@king1.vineyard.net> From: "Ted Stanley" To: "LML reply address" Subject: RE: Re: Galvanic Series Date: Tue, 30 Jan 2001 23:44:31 -0500 X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Dear N295VV aka dj - I think it was me under the heading of "Corrosion due to dissimilar materials" that posted the listing galvanic interactions. Nice post by JonWilcox regarding the galvanic issues. Thanks Jon ! FAA Advisory Circular AC 43-4A - CORROSION CONTROL FOR AIRCRAFT is a VERY comprehensive document on the subject of corrosion. It has a few interesting things to say such as: Galvanic Corrosion. Galvanic corrosion occurs when two dissimilar metals make electrical contact in the presence of an electrolyte. The rate which corrosion occurs depends on the difference in the activities. The greater the difference in activity, the faster corrosion occurs. For example, magnesium would corrode very quickly when coupled with gold in a humid atmosphere, but aluminum would corrode very slowly in contact with cadmium. The rate of galvanic corrosion also depends on the size of the parts in contact. If the surface area of the corroding metal (the anode) is smaller than the surface area of the less active metal (the cathode), corrosion will be rapid and severe. When the corroding metal is larger than the less active metal, corrosion will be slow and superficial. For example, an aluminum fastener in contact with a relatively inert Monel structure may corrode severely, while a Monel bracket secured to a large aluminum member would result in a relatively superficial attack on the aluminum sheet. Ted Stanley - A&P-IA >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>