WIP - Making the "Coppadashi"

Fellhoelter said:
No, I believe the method you fused them with will not negate the last condition, but most definitely assures that the first 3 are met.
As soon as you have an electrolyte touching both metals, you have met all 4 requirements.
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I was speaking more of corrosion occuring between the copper and steel. Surface oxidation is easily dealt with(especially considering that my finishes welcome patination... lol)

I have seen this discussed in other threads over the years but have yet to see any examples of GC in knife fittings. Perhaps, it doesn't pose as much of a threat as "regular old oxidation". Like I said, my only worry is if corrosion can break the bond, causing the copper of flake off. As I see it, the fusion of the copper and steel forms the electron conduction and the atmosphere allows for the ionic conduction. That said, I believe that basic carbon steel knife care practices would keep it in check . If you aren't taking care of plain carbon steel blades, they will rust, regardless of dissimilar metal corrosion.

Thanks for the compliment, Brian... and I appreciate you bringing the question to the table(screen?... whatever... thanks).
 
In my experiance, if complete bonding occured, the chances are slim to none of GC effecting the bond. All my years in the marine industry dealing with corrosion I have yet to see a copper clad object separate without a point of entry of some form of inclusion near the edge of the bond. For hundreds of years ships were sheathed in copper below the waterline for its antifouling properties, and would only need to be replaced maybe every 30-40 years.

I imagine that brazing would be susceptable to similar issues but is widely used with no issues. But I could be wrong about that.

In short, with no "extra" care I bet these knives will outlive us all and in 2000 years when archiologists dig them up they can confirm just how primitive Rick really is by not leaving the copper age...


This is just my opinion and experiances, not backed up by any white papers or anything.


-Xander

ETA: of course if your concerned you could include a grounding wire and sacrificial annode in the sheath...
 
fast14riot said:
and in 2000 years when archiologists dig them up they can confirm just how primitive Rick really is by not leaving the copper age...

ETA: of course if your concerned you could include a grounding wire and sacrificial annode in the sheath...
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A couple of awesomes right there, I tell ya!:thumbup:
 
Yes that is! Xander had me rolling... :D

Cool stuff Rick, I'm really liking the idea.

I used to sell copper jewelry for a living, my wife made most of it. With copper it seems on one hand people just won't buy it because it can oxidize. On the other hand some people find it cool that it changes. Either way their mind is usually made up! A friend of ours treated her copper with a secret process, I think it was baked on shellac made from melted wax dop sticks but I'm not sure. I still have some of her work and it has been four years with no change.

I have been working with some copper and I have to say it is way tougher than expected! I used some liver of sulpher to patina it and it came out cool.

I can't wait to see this one finished up!
 
Thanks a lot for this thread it is really informative. The gears in my head are spinning double time.

Charlie
 
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