Summary for stable bare metal anode Discussion
stable bare metal anode is the key issue here: Mark O'Dowd asked what bare metal rod would resist rusting and deliver a stable current in highly acidic water, and whether iridium would work. The reply explained that the right metal depends on the exact chemistry of the reservoir, so the question is too vague for a single material recommendation. It is not only about corrosion resistance; the anode also has to favor oxygen liberation instead of being consumed itself. The answerer noted that platinum-clad titanium is commonly used in such applications and suggested searching for "dimensionally stable anodes" for more research. They also said pricing varies with quantity, but these anodes are not cheap, though still less expensive than solid precious-metal options.
Q. I would like to learn about some price ranges for bare metal anodes. the price range for a 6 inch by 8mm in diameter rod. what metals would resist rusting and provide a stable current into a reservoir of highly acidic water? Iridium?
your help will be appreciated……
Mark Odowd
mfk – Austin, Texas, US
2004
A. Which metal to use depends on exactly what is in that ‘reservoir of highly acidic water’, and your inquiry is vague about that. It’s not just a matter of chemical resistance, but the anode must be of a material which will cause oxygen to be liberated in preference to the anode metal being oxidized. Platinum clad titanium is used in many such applications. Price depends on whether you need one or millions, but they’re not cheap., although they’re far cheaper than solid precious metals.
If you look up ‘dimensionally stable anodes’ you can find more research material.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
2004