Storing Silver Coins In Titanium

that tube is gorgeous, I want one :), and back to my other comment, yes titanium powder is very reactive but as nod2003 stated large blocks are stable you would be really suprised how reactive most metals are at high temps and low SA, as in powder. Just another side note, I know you never clean coins but I would atleast dry them out VERY well because wet coins (from sweat or humidity) plus salt from your hands will form a salt bridge, which is required for the galvanetic effect to occur as Jaobler said. With no salt bridge, no battery will form and your coins will be completly safe :), that said...

CAN I GET ONE?!

ps. good discussion guys

Very cool looking tubes! I was thinking....a couple ideas for you.

* Make the tubes big enough to fit a papered roll into them. Then you don't have to worry about any galvanic effects.
* For long term storage, put some Teflon pipe tape around the threads to seal it better.

how do you machine titanium, can just heavy duty lathe do it, with special blades, or do you just change/sharpen the blades constantly and PM sent

If you look up the problems with dissimilar matals touching each other you would find that is actually a benifit for temperaturee analysis. An industrial type of thermocouple is based on different metals touching each other. It's not Oxygen or Moisture that does this though so that is not the problem. It's changes in temperature that creates the electrical charge from the touching of dissimilar metals. And pending on the location there are different types of those metals used for the wiring. Some wiring manufacturers specialize in thermocouple wiring for all types of temperature controls.
The principal is a small threaded holed is placed in a pipe, air duct, gas duck, etc. Into this thermowell is screwed into a thermohead where the two dissimilar wires are conntected. Those wires are placed in Steel only conduits back to a meter that is sensitive enough to record temperature changes. As a temperature change occurs in that item, an electrical pulse is created and the meter reads that change.
Similar electrical charges are created in the ground where different metals touch and that is the purpose of what is called cathodic protection of grounding systems. For example in areas where the ground is high in Aluminum content, Copper can not be used for grounding systems due to the dissentigration of the Copper.
In other words storing Silver coins in a metalic tube is dangerous if there are temperature changes in the area.

It's really not the conductivity of the metal, it's just the ability to create an electrical current with changes in temperatures. Leads and Northrup used to specialize in these types of wires. Some are the oddest metals that you wouldn't think would possibly be usefull for that purpose. However, some locations where these are used makes the types of wire metalic properties of spicific requirements. Over boilers in Fossil fuel power stations high heat metals are requred. Where air ducts are massive, several different types are utilized and the terminations are run through a swamping box for averaging temperature changes.
Summation is it is just not smart to place metalic coins in a metalic container where differences in temperature may and/or could occur.

We used to use stainless steel chests for storing infrequently used copper molds. To abate any chance of pitting or damage I just sprayed the stainless with a light coat of polyester resin (AKA liquid fibreglass resin). It's a long chain synthetic polymer basically impervious to anything and can be UV stabilized as well with an additive if required.

Later, when I built new ones, I switched to lining them with sheets of teflon which had become available and was about as inert as it anything on the planet.

I've stored coins in telfon wraps before but anything needing long term storage I always used plastic tubes since they are cheap, plentiful and offer great damage resistance and always happen to be just the right size.

Any usage of Stainless Steels for anything should be investigated as to the ASTM ratings. There are virtually many hundreds of types of Stainless Steels. Some are actually non-magnetic due to the composition. Such are used for medical supplies and for operations work well. Some will actually Stain, rust, tarnish, etc. Many of the SO CALLED Stainless Steels flooding into our country from certain other places list on their products Stainless Steel. This is usually the lowest possible grade allowed to be classified as Stainless Steel. As an example many knives from Pakistan are labled Stainless Steel and contain small amounts of dangerously poisonous substances but meet the bottom scale of Steel standards.
I really find it so amazing how so many of us attempt to find the perfect storage container for coins and those little plastic rolls work so well.