We are having an issue where polyester powder coated brass samples are developing brown spots (almost certainly corrosion) after being powder coated and sitting for a while. The technicians claim they do not see this phenomenon during salt spray and humidity testing. Pinholes? Contamination?
I...
Compositepro, we are not synthesizing the polyester. It is a prepared powder coat from a reputable vendor. We are applying the polyester clear coat onto a metal substrate, curing it and then subjecting it to salt/fog testing. Then after ~24 hrs at rest at RT, the micro-cracking/crazing is...
The polymer is a spray on powder coat polyester. It is fine when it comes out of the salt/fog chamber, but after aging for ~24 hours at RT, micro cracks/crazing is observed. According to the Datapaq cure cycle profile it is being cured properly. Thoughts? Thanks.
My first day on the job is today. I will find out for myself and then pass it along. I am unsure of the polymer, but the ambient conditions are just regular RT temperature and humidity as far as I know. Thanks for your response, cloa.
Hello, we use a polymer coating on steel and although it comes out of the salt/fog chamber fine, after about 24 hours it shows micro cracks. Any ideas? Thanks in advance.
