Surface Engineering Forum

  • Alternative Forum Home PageSEF Portal
  • Old S E Message Board ArchivesOld Message Board Archives
  • Search
  • Member List
  • Calendar
  • Help

Current time: 04-23-2018, 12:08 PM Hello There, Guest! (Login — Register)


Surface Engineering Forum / Surface Engineering / Surface Engineering Threads v
1 2 3 4 5 ... 30 Next »
/ Winter spray problems




Post Reply 
Threaded Mode | Linear Mode
Winter spray problems
01-18-2018, 03:41 PM
Post: #1
Bacon Offline
Member
***
Posts: 5
Joined: Mar 2015
Reputation: 0
Question Winter spray problems
Hi everyone

Does anyone of you have problems during the colder month of the year? I work for a company in northern Canada that plasma spray chromium oxide with 100he gun and, between December and March, we always have problems like coating spitting, rough bond coat or coating pull-offs at the grinding step. Outside temperature varies between -35C and -5C.

Our powders are stored in a heated closet. Gases are outside but there are enough tubing inside the building that the gas temperature entering the mass flow meters stay near room temperature (20C)

Any ideas what to look for? Now we are testing smoother parameters at lower feed rate.

Thank you

Mike
Find all posts by this user
Quote this message in a reply
01-18-2018, 07:51 PM
Post: #2
Vadim Verlotski Offline
SuperMember
******
Posts: 113
Joined: Sep 2014
Reputation: 5
RE: Winter spray problems
(01-18-2018 03:41 PM)Bacon Wrote:  Hi everyone

Does anyone of you have problems during the colder month of the year? I work for a company in northern Canada that plasma spray chromium oxide with 100he gun and, between December and March, we always have problems like coating spitting, rough bond coat or coating pull-offs at the grinding step. Outside temperature varies between -35C and -5C.

Our powders are stored in a heated closet. Gases are outside but there are enough tubing inside the building that the gas temperature entering the mass flow meters stay near room temperature (20C)

Any ideas what to look for? Now we are testing smoother parameters at lower feed rate.

Thank you

Mike

Hi Bacon,
All these problems can be caused by water condensation on cold metallic surfaces. If your parts are not preheated before sandblasting, condensation may adversely affect adhesion (cold blasted surface tends to corrode). Condensation in powder containers and powder lines is equally dangerous, which can cause spitting.
Send this user an email Visit this user's website Find all posts by this user
Quote this message in a reply
02-07-2018, 09:19 PM
Post: #3
demionkrishan Offline
Active Member
****
Posts: 29
Joined: Dec 2015
Reputation: 0
RE: Winter spray problems
Try to increase chiller water temperature by another 10F. Usually it will be 60F make it as 70-75. Is your gun getting moisture during spray? If it so then, try to dry
Send this user an email Find all posts by this user
Quote this message in a reply
03-06-2018, 07:44 PM
Post: #4
ThePlummer54 Offline
Junior Member
**
Posts: 4
Joined: Feb 2018
Reputation: 0
RE: Winter spray problems
Reduce argon flow and pressure a little
Send this user an email Find all posts by this user
Quote this message in a reply
« Next Oldest | Next Newest »
Post Reply 




Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Cr2O3 chromium oxide spray problems by Plasma anne 9 3,054 08-01-2016
08:15 PM
Last Post: anne
  Plasma spraying microspheres, problems with clumping ThermalSprayingPhysicist 10 3,731 06-24-2015
02:26 PM
Last Post: loriolo
  Problems to coat small spheres with APS Victor Rubio 9 4,221 03-19-2014
02:45 AM
Last Post: Victor Rubio
  coating problems on spheres Victor Rubio 0 931 02-27-2014
09:37 PM
Last Post: Victor Rubio
  Porosity Problems Spraying Metco 72F-NS / Wc-114 J_rock 12 14,170 12-04-2013
05:18 PM
Last Post: JeffVigor
  problems with T800 HVOF stokee 22 28,112 08-13-2012
10:08 AM
Last Post: wgg237
  Clogging problems with WC-Co Fine powders Met.Eng. 2 2,845 01-03-2011
03:09 AM
Last Post: kschewe
  spray and fuse substrate problems pakalano 2 4,724 03-26-2009
11:44 PM
Last Post: pakalano
  problems spraying metco 320NS with F4 gun aerosam 5 8,678 02-24-2009
10:58 PM
Last Post: Diucky
  Problems with aluminium-silicon coating gasper 6 11,729 05-10-2007
03:01 PM
Last Post: gasper

  • View a Printable Version
  • Send this Thread to a Friend
  • Subscribe to this thread


User(s) browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd

    Subscribe in a reader

    Contact Us | Thermal Spray Coatings | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication

Powered By MyBB, © 2002-2018 MyBB Group.


© Copyright Gordon England