Polypropylene (Modified - PP)

[FYS]

Polypropylene (Modified - PP) field joint coating, flame sprayed, 8mm thick, on epoxy (FBE). There is no adhesive layer between the FBE and the PP (the adhesive property comes from the PP?) the problem is the adhesion between the FBE and the PP in not good, easily comes off.

The test was done without any procedure, just cut the PP and test adhesion - easily comes off

Please can you advise, what is the cause of the failure and also what should be done in the future to prevent this and any test should be carried out.

 

[LittleWheels]

Is the Corrosion engineering forum the best choice for this enquiry?

 

[MikeHalloran]

PP is a great material for chemical containers because nothing attacks it ... which also means that nothing sticks to it.

Given the thermal spray coating method, you might have a chance at mechanical adhesion if you >severely< roughen the epoxy first.



Mike Halloran
Pembroke Pines, FL, USA

 

[Compositepro]

One possibility is to use epoxy to band a wire mesh or knit to the surface and then flame spray.

 

[SJones]

I'll give the same answer here as in the other forum where the question was double posted:

Review ISO 21809-3

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04