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Date: Thu, 30 Aug 2007 12:18:43 -0400
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From: Lorn H Olsen <lorn@dynacomm.ws>
Subject: Re: TSIO-550 Engine fittings question

Rick,

I have included below a letter posted to the LML several years ago.  
You may find it helpful.

On my boat I have started using a lubricant called Tef-Gel (http:// 
www.tefgel.com/tef_gelm_information.htm). This lubricant is supposed  
to stop corrosion between dissimilar metals (like mast aluminum and  
stainless steel screws). A google search for Tef-Gel will give you  
the suppliers.

Lorn

> On: Mon Apr 15 16:31:24 2002
> From: "Ted Stanley" <direct@vineyard.net>
>
> Regarding corrosion and the results of using various materials next  
> to one another I thought I'd pass on the listing below which should  
> be of interest to builders.
>
> Avoid having materials next to each other that are widely separated  
> on the listing below. Note too that the material at the corroded  
> end of the chart will do just that, corrode, when placed next to a  
> material at the other end of the chart.
>
> Naturally anything that acts as an electrolyte only aggravates the  
> process.
>
> When I was in A&P school I had to build an aluminum wing rib as a  
> project. As an experiment I asked a commercial fisherman friend of  
> mine to toss it in the bow of his boat for a week. The result was  
> almost no corrosion. I took it back and riveted a copper penny to  
> it and sent it back to the bow of the boat. A week later the rib  
> was badly corroded, particularly between the penny and the aluminum.
>
> Hope everyone finds this useful.
>
> Ted Stanley - A&P-IA
>
> ---------------------------------------------------------------------- 
> ----
>
> GALVANIC SERIES OF METALS AND ALLOYS
>
> CORRODED END ( ANODIC OR LEAST NOBLE)
>
> MAGNESIUM -2.375
> MAGNESIUM ALLOYS
> ZINC -0.7628
> ALUMINUM 5052, 3004, 3003, 1100, 6053
> CADMIUM
> ALUMINUM 2117, 2017, 2024
> MILD STEEL (1018), WROUGHT IRON
> CAST IRON, LOW ALLOY HIGH STRENGTH STEEL -0.036
> CHROME IRON (ACTIVE)
> STAINLESS STEEL, 430 SERIES (ACTIVE)
> 302, 303, 321, 347, 410,416, STAINLESS STEEL (ACTIVE)
> NI - RESIST
> 316, 317, STAINLESS STEEL (ACTIVE)
> CARPENTER 20CB-3 STAINLESS (ACTIVE)
> ALUMINUM BRONZE (CA 687)
> HASTELLOY C (ACTIVE) INCONEL 625 (ACTIVE) TITANIUM (ACTIVE)
> LEAD - TIN SOLDERS +0.15
> LEAD
> TIN
> INCONEL 600 (ACTIVE)
> NICKEL (ACTIVE)
> 60 NI-15 CR (ACTIVE)
> 80 NI-20 CR (ACTIVE)
> HASTELLOY B (ACTIVE)
> BRASSES +0.522
> COPPER (CA102)
> MANGANESE BRONZE (CA 675), TIN BRONZE (CA903, 905)
> SILICONE BRONZE
> NICKEL SILVER
> COPPER - NICKEL ALLOY 90-10
> COPPER - NICKEL ALLOY 80-20
> 430 STAINLESS STEEL
> NICKEL, ALUMINUM, BRONZE (CA 630, 632)
> MONEL 400, K500
> SILVER SOLDER
> NICKEL (PASSIVE)
> 60 NI- 15 CR (PASSIVE)
> INCONEL 600 (PASSIVE)
> 80 NI- 20 CR (PASSIVE)
> CHROME IRON (PASSIVE)
> 302, 303, 304, 321, 347, STAINLESS STEEL (PASSIVE)
> 316, 317, STAINLESS STEEL (PASSIVE)
> CARPENTER 20 CB-3 STAINLESS (PASSIVE), INCOLOY 825NICKEL - MOLYBDEUM -
> CHROMIUM - IRON ALLOY (PASSIVE)
> SILVER +0.7996
> TITANIUM (PASS.) HASTELLOY C & C276 (PASSIVE), INCONEL 625(PASS.)
> GRAPHITE +0.8
> ZIRCONIUM
> GOLD +1.68
> PLATINUM
>
> PROTECTED END (CATHODIC OR MOST NOBLE)=20
>
> ---------------------------------------------------------------------- 
> ----
>
> The Mc Nally Institute
> 1986 S. Belcher Rd. Clearwater, Florida 33764
> Phone 727 535 6450 Fax 727 535 8150
> E mail mcnally@earthlink.net
> http://www.mcnallyinstitute.com/Charts/galvanic-series.html</x-rich>