Posted by Gordon England on March 25, 2003 at 14:29:48:
In Reply to: remove tungsten carbide HVOF posted by Paul on March 21, 2003 at 16:43:25:
: Dear all,
: We need to weld some Ni-Fe-Cr compressor blades that are coated with tungsten carbide HVOF. What is the best way to remove these coatings? Thanks for any help you can provide
Hi Paul
Electrolytic method:
20% sodium carbonate
5% tartaric acid
75% water
temperature 70-80 degree C
Stainless steel cathode, coated part anode
current density 4-8 amps/sq in @ 6 volts DC
Chemical/mechanical method:
Various commercial nickel strip solutions may be used to degrade the coating in conjunction with mechanical methods such as gentle grit blasting.
Mechanical methods such as grit blasting or very high pressure water jet blasting may be necessary if chemical or electrolytic methods fail.
What ever method you choose it would be advisable to conduct tests first, to ensure effective coating removal with minimal damage to substrate.
Regards Gordon
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