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Location: New Orleans Louisiana
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Re: Aluminum screws instead of stainless
Titanium is higher on the galvanic chart, but it has the advantage that when exposed to air or water titanium instantly creates a titanium oxide coating that is an insulater. So that a titanium-aluminium joint has a lot of galvanic potential, but very little current. Simply because the resistance is so high.
I DO NOT recommend installing titanium directly onto other metals without insulation, but I can point you to a few studies that found that a titanium-stainless joint actually corrodes slower than a stainless-stainless joint. Because of the insulating properties of titanium.
And as for cost... Somewhere between the cost of 316L and siliconized bronze fasteners typically. Specialty fasteners can vary widely though.
Last edited by Stumble; 04-08-2013 at 12:58 PM.