APS WC coating delamination
07-19-2010, 11:00 PM,
APS WC coating delamination
Hello all,
I am new to this forum and am in need of some help. I work for a company that uses the Northwest Mettech Axial III spray system to spray WC powder onto a thin steel substrate (as low as 0.015”). We have run into some issues, namely poor porosity and delamination from the substrate and in the coating itself. We seem to have corrected our porosity issue by using a finer grain of powder, but that has only served to increase the amount of delamination we are seeing. Typically our coating needs to be anywhere from 0.005” to 0.012” thick. Is there anything short of purchasing an HVOF system we can do to reduce the amount of delamination?

Thanks in advance
07-22-2010, 03:36 PM,
RE: APS WC coating delamination
Delamination occurs when the stress in the coating exceeds the bond strength to the substrate. To solve your problem, you need to increase bond strength or decrease stress. Using the finer powder increases the coating stress because the molten particles contract when they cool and solidify. If you are doing a good job preparing the surface for spraying, you could try applying thinner layers or a bond coat. Otherwise, I would suggest going back to the larger particle size and working on another solution for the porosity problem.
07-22-2010, 04:30 PM,
RE: APS WC coating delamination
djewell thank so much for responding

Possibly Related Threads…
Thread Author Replies Views Last Post
  T800 coating delamination alvliew 5 4,382 05-05-2017, 02:54 AM
Last Post: KevinS
  Thermal barrier delamination problem Hector Monjardin 2 3,528 09-25-2015, 11:05 AM
Last Post: Joris Kraak
  Coating delamination problem texnicar 13 9,020 07-07-2015, 10:37 PM
Last Post: Johnny_Blaze
  45VFNS Delamination Meeker77 2 3,313 05-24-2015, 05:46 PM
Last Post: Meeker77
  Delamination BatuhanCemreAyas 2 3,381 01-02-2014, 06:30 AM
Last Post: sprayjet
  delamination in the coating codep 3 5,648 05-15-2013, 05:04 PM
Last Post: Gordon
  delamination in general epilson 1 3,375 06-21-2011, 07:45 PM
Last Post: Gordon
  delamination of spray - fuse coating Arturas 10 11,160 04-01-2009, 05:13 PM
Last Post: Gordon
  Inco 718 complete delamination!! TurbineWorks 5 7,670 06-15-2008, 03:28 PM
Last Post: Gordon
  Delamination bgmach 2 5,389 04-04-2008, 02:49 PM
Last Post: Vijay Deshpande
  Delamination of Aluminium Polyester Coating fhyuan 1 8,236 01-27-2008, 08:19 PM
Last Post: Gordon
  Delamination in Polyester B50TF222 top coat gejohn 1 6,905 05-03-2007, 05:52 PM
Last Post: Gordon

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd