Posted by John Carleton on July 24, 2003 at 10:03:40:
In Reply to: Re: Tungsten Carbide onto Titanium posted by Gordon England on July 22, 2003 at 13:09:28:
: : Can you tell me is a Nickel based Tungsten Carbide Coating resistant to hydrochloric acid up to 5% entrained in gas, which is 15% carbon monoxide, 30% carbon dioxide, 40% nitrogen, 2-3% carbonyl sulphide and sulphur dioxide. This is to be sprayed onto a Titanium substraight to resist abrasion. Working temp only 80 C.
: : Thanks for your help in advance
: John
: I would have doubts about the corrosion resistance of HVOF WC/Ni coatings in this environment, certainly without testing first. Also, consider WC/20Cr/7Ni.
: Chromium carbide/nickel chromium (or NiCrMo matrix preferably) may a bit more corrosion resistant, but will have lower abrasion resistance. Again, I would advise testing.
: Plasma sprayed alumina or chromium oxide coatings should not be effected by this environment, but you would have to check whether they are mechanically suited.
: Regards Gordon
Thanks for the reply.
I to have my doubts about plasma ceramic's to. I actualy did mean WC/20Cr/7Ni (my mistake) Both the above have proved successful in resisting abrasion in other areas of the same plant. My main worry is the Hydrochloric acid. I think I'll plump to trial the Nickel Chrome Carbide (safer bet) not a huge difference in hardness.
Many thanks again for your answer it confirmed my thoughts. congratulations on a useful site.
regards
John
p.s.
Looking at your past history, were you in Metco with the likes of Mick Biggnal, Steve Bomford, Doug Keyworth???etc.
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