Hetal

A coating seals in as well as out.

It would seem from your description that you have a very dirty assembly and are expecting a conformal coating to protect the circuit from a tough environment. There is no coating in the world that will do what you ask if the problem pre-exists beneath it.

Happily the acrylic coating will be relatively easy to remove and, in so doing, the board will be cleaned. This would be a good thing.

Of course you have already verified that you had applied the correct coating thickness and coverage in the first place?

Graham Naisbitt
Gen3 Systems

On 22 Mar 2011, at 15:00, Hetal Shah wrote:

> Hello,
> 
> 
> We have been using the acrylic  coating and it is failing.  My application
> is a small, expensive  copper/solder circuit board which must operate
> exposed in a greenhouse environment with humidity up to at least 80 per cent
> and temperature from about 55 to 85 deg F.  There is evidence of green
> corrosion products and peeling conformal coating which presumably need a
> more appropriate coating.
> 
> We have to do rework and use agin same pcb boards. We would be very grateful If
> anyone can be advised how to remove corrosion from the board.
> 
> 
> 
> thanks
> 
> Hetal Shah
> 
> MG Chemicals
> 
> 
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