"Valve Metal" origin
"Valve Metal" origin
(OP)
Does anybody know the origin of the term "valve metal?" I know what a valve metal is, but not why they use the word "valve."
Thanks!
Thanks!
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RE: "Valve Metal" origin
That said it is not a technical specification that I know of.
Nick
I love materials science!
RE: "Valve Metal" origin
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Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net
RE: "Valve Metal" origin
These anodes are often referred to as composite anodes. Physically, this term refers to a ductile, corrosion resistant base metal covered with the highly conductive stable film described above. The base metal, titanium, provides the required toughness for the system. The titanium substrate is classified as a "valve metal" or film forming metal. Such metals in their natural state are protected by thin, self-healing, tightly adherent oxide films which are acid resistant and resist the passage of current in the anodic direction. Thus, if an attempt is made to operate a valve metal as an anode, it is necessary to raise the potential of the valve metal surface to a high value in order to pass significant current through the anode.
RE: "Valve Metal" origin
Modified oxygen reduced valve metal oxides - Patent 6639787Pressed material such as anodes are described and formed from oxygen reduced oxide powders using additives, such as binders and/or lubricants.
www.freepatentsonline.com/6639787.html - 71k - Cached - Similar pages
[ More results from www.freepatentsonline.com ]
RE: "Valve Metal" origin
RE: "Valve Metal" origin
I would agree with sreid, that in your case the derivation probably comes from the old (British?) term for electronic vacuum tubes.
RE: "Valve Metal" origin
= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net
RE: "Valve Metal" origin