I am heating the galvanizing bath with ceramic tubes which is covering the heaters but the life of that tubes is between 6-12 months. I am searching the pure titanium to using in galvanizing bath for covering heaters. Does anybody have information?
Titanium heaters work well in chromating bath (CrO3 + H2SO4) and in baths using nitric acid. In hydrochloric, sulfuric, phosphoric and particular in hydrofluoric acid titanium will be destroyed.
Dear Vadim,
Thanks for reply but the heaters are not titanium. I mean covering the heaters by pure titanium. If I use the pure titanium tubes instead of ceramic tubes, what will be the behaviour of pure titanium?
Thermal conductivity of pure titanium is 21.9W/mK at 300K.
Dear Abdulwahab,
I know that some galvanizers use titanium for the jigs (hanging structure for the goods to go through the galva process). The jigs only remain for some minutes in the zinc bath and not constantly, as in your case. But since titanium does not or even very little react with the zinc alloy and experience in case of jigs seems to be positive I suppose, that titanium could well resist.
The answer depends partly on the temperature of the galvanizing bath. The Zn - Ti equilibrium diagram shows that Zn forms many high-Zn intermetallic compounds with Ti. So the life of the Ti tubes is going to depend on the kinetics of Zn diffusion into the solid state Ti. On the basis of "lattice" diffusion, this should take a long time, but at low temperatures (from the point of view of Ti) there may be complications from short circuit diffusion, depending on how the Ti is processed. I suggest an experiment. I assume you are still using ceramic tubes. So why not place a couple of Ti samples into your bath, one anodized and one not. Next time you need to replace the ceramic tubes, take out the Ti samples, examine them metallurgically and see how they are doing.
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