Blisterning on the epoxy coating
Blisterning on the epoxy coating
(OP)
Hello ,
We got some butterfly valve disc coated with epoxy. After immerge the disc into the water and applied the hydrostatic pressure of 200 psi and put the disc in the water with 200 F, the coating got blisterling problem.
Question:
It is blistering on the coating surface a failure?
After all, the disc works eventhough there are small bubbles on the surface
We got some butterfly valve disc coated with epoxy. After immerge the disc into the water and applied the hydrostatic pressure of 200 psi and put the disc in the water with 200 F, the coating got blisterling problem.
Question:
It is blistering on the coating surface a failure?
After all, the disc works eventhough there are small bubbles on the surface





RE: Blisterning on the epoxy coating
RE: Blisterning on the epoxy coating
RE: Blisterning on the epoxy coating
Let's assume your epoxy-coated valve was free of film imperfection prior to service. Blistering, then, must have occurred from water permeation.
Epoxies are thermally stable to 300 F, it's true. Still, this doesn't ensure the perfect barrier at elevated temperature and pressure.
For starters, identify your coating's thickness. Generally speaking, epoxies included, 10 mils (= 0.010 inch = 250 micrometer) should be a targeted minimum. You see, achieving a 'pin-hole-free' surface is key.
Consider, too, fluoropolymer-based coatings. ETFE offers exceptional corrosion protection and permeation strength, and with many of the characteristics of epoxies.
For more information, see:
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Good luck!
William Gunnar
http://www.IndustrialCoatingsWorld.com
RE: Blisterning on the epoxy coating
RE: Blisterning on the epoxy coating
You may also want to take a look at the discussion forum for simulation of chemical-physical properties of polymers and composite materials: h
On this forum you will find several cases similar to yours.
Regards,
Rodney
RE: Blisterning on the epoxy coating
Yours is a good link. I like it.
RE: Blisterning on the epoxy coating