Posted by Gordon England on June 02, 2003 at 12:09:44:
In Reply to: Remove Chromium Carbide posted by C. Yeung on May 28, 2003 at 15:25:25:
: Dear All,
: What is the best way to remove chromium carbide on stainless steel substrate? Thanks for your help in advance.
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 method:
Sodium hydroxide molten salt bath (425 degree C)for up to 30 mins followed by water quench. Repetition may be necesary. Gentle grit blasting may also necessary if coating has only been degraded.
Mechanical methods such as grit blasting or very high pressure water jet blasting may be necessary if chemical or electrolytic methods fail.
Which 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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