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Earlier someone had asked me for an galvanic corrosion chart and I said I
would send it in when I found it.

Titanium was not listed on this chart but the Kitplanes article I got this
from said that it is down near the bottom.

Like materials in contact will corrode less. You can also insulate active
materials from each other with fiberglass or paint if you can keep the joint
dry.

Here is the chart in order of potential:

Anodic (most active)

Magnesium alloys
Zinc
Alclad 7000 series aluminum alloy
bare 5000 series aluminum alloy
bare 7000 series aluminum alloy
cadmium
bare 2000 series aluminum alloy
steel/iron
lead
chromium
brass/bronze alloys
copper
stainless steel/high heat steels
silver
nickel/high nickel alloys
graphite composites

cathodic (least active)

(from Sept 97 Kitplanes, pg. 34)

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