Adhesion to Shot Peened Titanium
09-26-2013, 02:25 AM, (This post was last modified: 09-26-2013, 02:27 AM by ServiceTech.)
Adhesion to Shot Peened Titanium
I have an aerospace application to plasma spray WcCo 12% onto shot peened Ti 6-4. The powder material is Metco 72F-NS or Praxair Wc-114
I am spraying onto test specimens of Ti 6-4 which have been shot peened to the intensity as the production part. The parts and specimens are grit blasted with virgin Aluminum Oxide 60 mesh grit to 100 Ra. I am experiencing interface separation when examining the coating microstructure. On unpeened samples, there is no separation. I have even shotpeened half of a sample and sure enough, only the peened half presents interface separation. Also, I've tried cleaning the samples with some light abrasive (Scothbrite) and acetone with the same results. I assume the problem is the hardness of the peened surface however, I am at a loss to remedy the situation. I am going to experiment with various grit blast pressures in an attempt to improve the situation. I would appreciate any input from people with experience in this application. Thank you.
02-10-2014, 10:48 PM,
RE: Adhesion to Shot Peened Titanium
Have you tried (or can you try) and cleaning Ti acid cleaning solution. You may be accidentally laying down a lubricant or contamination layer during the shot peening that is not removed by the grit blasting.

Possibly Related Threads…
Thread Author Replies Views Last Post
  Adhesion testing MartinFe 2 3,539 05-04-2015, 01:49 PM
Last Post: djewell
  How can adhesion of Gold Germanium alloy on GaAs substrate be improved??? xoobiii 0 3,356 02-21-2012, 12:09 PM
Last Post: xoobiii
  High Temp Adhesive for TSA Adhesion test wrjordan 3 6,431 07-22-2011, 06:51 PM
Last Post: MichiganMan
  Titanium adhesion Superspray 2 4,277 06-27-2011, 03:23 PM
Last Post: Superspray
  Non-stick and adhesion properties of coatings qwerty 2 6,388 12-15-2010, 06:46 AM
Last Post: ives
  Shot peening and increase in Stainless 316L hardness? bry1975 3 9,843 11-30-2009, 03:22 PM
Last Post: Grettir

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd