Spraying on nitriding surface
06-14-2007, 02:07 PM,
Spraying on nitriding surface
Hi forum,

I need help. Ashamed0002We have troubles with HVOF spraying on nitriding surfaces. We use stainless steel FeCrNiBSiC. If coating contact with nitriding surface, his crashed. What I can to do?
May be anybody recommend other material with microhardness around 800HV for repair and build-up.

Thank you.
06-14-2007, 02:31 PM,
RE: Spraying on nitriding surface
Hi Panf

Coating nitrided surfaces can be difficult. It is difficult to get a decent grit blast profile and many coatings appear not to bond too well compared to untreated steel, particularly if white layers are present.

I would recommend removing the nitrided layer if that is possible.
06-18-2007, 04:41 PM,
RE: Spraying on nitriding surface
Nitrided layer removal, as suggested by Gordon is necessary to build up spray deposit.To soften the nitriding layer you can do a heat treatment at 500-540C,nitriding temperature.Alternatively you can use diamond/or BN tools to remove the thin nitride layer.
ram chattopadhyay
06-21-2007, 08:59 AM,
RE: Spraying on nitriding surface
Yes, I see
But what to do, if I coating the surface right against the nitrided surface
I need to place masking shield over nitrided surface, and during spraying the coating deposit on her and crashed Sad
06-25-2007, 02:07 PM,
RE: Spraying on nitriding surface
Hi Panf

Sorry, I am having trouble understanding what you are trying to achieve. Could you try to give us more information (a sketch or drawing may be helpful).
06-26-2007, 02:56 PM,
RE: Spraying on nitriding surface
yes, my English is very bad Ashamed0002


I hope Gordon will attach the sketch to my post
06-26-2007, 03:56 PM,
RE: Spraying on nitriding surface
Hi Panf

You can email me here or here with your image ideally in jpg or gif format. Or you could use one of many free file hosting sites, see http://www.gordonengland.co.uk/sef/image...t-139.html

Possibly Related Threads…
Thread Author Replies Views Last Post
  Surface corrosion when HVOF spraying vcduramais 4 1,069 08-20-2021, 11:25 AM
Last Post: vcduramais
  Thermal spray coating for Nitriding shantanu 4 4,843 04-25-2015, 08:47 AM
Last Post: Joris Kraak
  horizontal spraying on surface of circular parts. Eagleman 1 3,249 10-14-2013, 03:13 PM
Last Post: djewell
  Surface preparation before spraying HVOF minh_8888 4 8,480 06-20-2011, 12:18 PM
Last Post: Met.Eng.
  Porous Machined Surface on Part Lower Inner Diameter on Inco 718 Coating Surface Alexangel1226 4 8,104 03-19-2008, 02:05 PM
Last Post: Gordon

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd