Does layering different metals create errosion?

[lamontjb]

I was talking with my dad tonight about an idea I had for a guard. I wanted to epoxy titanium, nickel-silver, and titanium together to see what it would look like for a 1/4" guard. He started to ask me whether the two metals would create some kind of reaction... so I wanted to ask you guys.

I'm guessing I don't really have to worry, but investing on some titanium would at least deserve the question to be asked.

I'm planning on just using epoxy too.

On a side note, I just got my Dewalt Bandsaw (porta version). Really excited. Sure beats using a damn jigsaw right? Going to order the mount/stand for it soon and then it will be really setup.

 

[mete]

Your father is talking about galvanic corrosion where dissimilar metals put together form a galvanic cell [battery] .With moisture and something like salt one of the metals will see accelerated corrosion. With epoxy however the epoxy is an insulating barrier so the cell doesn't work.

 

[Rody]

Nickel and titanium are pretty far apart in the galvanic series so I'd use a proper insulator for certain. If you use real silver however you shouldn't have any problems. they are right next to eachother in the galvanic series. Also, salt water tests I've performed with silver-brazed titanium shows no signs of corrosion.

Cheers Rody

 

[Dan Pierson]

Nickel and titanium are pretty far apart in the galvanic series so I'd use a proper insulator for certain.

Nickel silver is white brass http://en.wikipedia.org/wiki/Nickel_silver.

So where are copper and the other common constituents on the galvanic series vs. titanium? How does the galvanic series apply with alloys?

 

[mete]

http://www.corrosionsource.com/handbook/galv_series.htm This one has alloys !

 

[Tai Goo]

Your father is talking about galvanic corrosion where dissimilar metals put together form a galvanic cell [battery] .With moisture and something like salt one of the metals will see accelerated corrosion. With epoxy however the epoxy is an insulating barrier so the cell doesn't work.

What Mete said.

Galvanic corrosion:
http://en.wikipedia.org/wiki/Galvanic_corrosion

 

[artmichalek]

Your father is talking about galvanic corrosion where dissimilar metals put together form a galvanic cell [battery] .With moisture and something like salt one of the metals will see accelerated corrosion. With epoxy however the epoxy is an insulating barrier so the cell doesn't work.

The cell can still work if there's moisture on the surface for a prolonged period, but for a properly stored knife this shouldn't be a problem. Epoxy should be sufficient to prevent the real issue, which is water getting trapped between the metal layers.