Gordon England Surface Engineering Forum

Re: remove tungsten carbide HVOF

Posted by Hugo on April 06, 2004 at 03:49:41:

In Reply to: Re: remove tungsten carbide HVOF posted by Gordon England on March 25, 2003 at 14:29:48:


what about other coatings such as TiO2, Cr2O3 on titanium and duplex parts?. I would like to remove them without blasting.



: : 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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