Gordon England Surface Engineering Forum



Re: spraying on polycarbonate


Posted by Ben Nakhosteen on May 14, 2004 at 19:09:02:

In Reply to: Re: spraying on polycarbonate posted by Gordon England on May 14, 2004 at 13:42:49:

: Hi Ben

: It is possible to thermal spray zinc coatings and other some coatings onto this type of substrate. It is important that care is taken in the spray process to keep plastic substrates cool, this along with good surface preparation is the key to successful coatings. Not sure about comparative bond strengths between adhesive cladding metal and thermal spray coatings, I guess they would be in the same ball park. At the end of the day I think you will need to test both approaches and compare performance and cost.

: Regards Gordon

Hi Gordon,

thanks for your immediate help.

I did a quick coating test today and the results are quite promising. I compared smooth dry cleaned with ethanol cleaned substrates but could not see any significant difference in coating quality.

However, I'm a little concerned about preparation of the plastic surface using chemicals since it may absorb liquid and may swell later on. I haven't tried sand blasting jet.

I agree that cooling is a very important issue. The part I tried today was only 1mm thick and fixed to a piece of copper. Propably this resulted in insufficient cooling since the part was a little warped after the process.

Another parameter is surface speed. I think I should try to increase from now 200mm/sec to about 2000mm/sec to reduce heat input in the part but for this I'll have to change the setup.

Thanks once again

Ben


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