Galvanic corrosion (brass to aluminum)

[Stelios_Rjk]

I face the effects of galvanic corrosion often while restoring a seagull outboards. Aluminum to steel or Brass to steel is relatively easy to handle. Heat, some lubricant or just excessive heat will free the screw that was stuck.

My last attempt was to free one brass thumb screw from an aluminum C-clamp (one of the latest transom bracket). Fairly nothing worked. It was one small piece broken inside the c-clamp. I could catch it so I heated the point and try in vain. Then I screwed it again in and with a die cleaned the threads. Again in the same point it stuck. In the end with the torch burning and me trying to turn the piece it finally break. I drill it and retap the c-clamp. If the screw was made of steel it would have been freed without much effort.

Again a support lug with the brass rod never freed. The lug was broken so I decided to cut it to remove it from the transom bracket.

Has anyone a solution to this situation?

[Collector Inspector]

A Marine environment and metals.

Once apon a time floating things were made from timber.............then metals of all sorts were introduced.

From then on the problems made manifest.

We have what we have now. Just depends on how what we have has been looked after.

B

[david doyle]

Bummer, that is why you should never buy buy one of those aluminum brackets with the titanium thumb screws

[Collector Inspector]

Wooden you have guessed?

Sigh........

B

[david]

Doesn't that cat ever stop?

[Collector Inspector]

She stops....................Keep on watching for the finale.

B

[denchen]

Ahhhh days when ships were made of wood and the men made of steel. Now, well ships of steel etc. Swing them lights.