88WC - 8Co - 4Cr Removal Advice
01-31-2007, 11:33 AM,
Question  88WC - 8Co - 4Cr Removal Advice
Hi all. Glad to be part of the clubSmile

I currently have a dilema regarding the removal of 88tungsten-carbide-8Cobalt-4Chromium coatings which are between 4 and 5 thou thick.

I found some previous articles on this site which suggested Enstrip-317GT but unfortunately, after many trials, the results were not encouraging. I think the problem relates to the Cobalt-Chromium constituents in the coating because 317GT should be very effective at stripping WC.

I know that electrolytic processes are probably the best option but as this is a new trial, the cost of buying the neccessary equipment is too great.

Our testing abilities include the option to introduce temperature and aggitation to products immersed within solution.

Any help and advice is very well appreciated Exclamation

All the best, Batsy.
02-02-2007, 04:58 PM,
RE: 88WC - 8Co - 4Cr Removal Advice
Hi Batsy

Sign0016 to the Surface Engineering Forum.

The chromium addition to these coatings does increase the corrosion resistance some what which will make them harder to remove chemically. Have you tried to used a combination of chemical strip and gentle grit/shot blasting in a cyclic manner until the coating gives in? Agitation and higher temperatures will certainly increase the aggressiveness of the chemicals, but you will also have to bare in mind the effect on your substrate material. Trying alternative more aggressive stripping chemicals may be worth trying, but again test for suitability with your substrate.
02-05-2007, 09:21 AM, (This post was last modified: 02-05-2007, 09:28 AM by Batsy.)
RE: 88WC - 8Co - 4Cr Removal Advice
Cheers Gordon.

To reduce stripping cost in relation to the number of procedures we'd like to use during the stripping process, we were hoping to limmit a light grit blasting process to the final stage. Also, we were concerned about the effects that multiple blasting stages may have on the surrounding parts of the component as the coating area is only part of the whole test peice.

I think your suggestion of using more aggressive chemicals may be our next option.

Thanks again,


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