Gordon England Surface Engineering Forum



Re: remove HVOF


Posted by Gordon England on April 25, 2003 at 01:31:14:

In Reply to: remove HVOF posted by Ard Trieling on April 15, 2003 at 15:28:50:

: Dear all,

: for my study project id like have some information about removing a WCoCr-HVOF coating.
: Thanks for any help you can provide

Hi Ard

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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