THICKNESS TESTING OF 316 L COATING
02-02-2007, 01:13 PM,
#1
THICKNESS TESTING OF 316 L COATING
Which is the best metod to check thickness of arc sprayed 316L coating on mild steel substrate
Vijay Deshpande
Reply
02-02-2007, 04:14 PM,
#2
RE: THICKNESS TESTING OF 316 L COATING
Hi Vijay

The best way would be to physically measure thickness with a micrometer or vernier type instrument. Using electronic devices (see quote from another thread) will have problems with this combination of coating and substrate. You may initially think that a non-magnetic 316 stainless steel wire would produce a non-magnetic coating and thus be suitable for measurement using a magnetic method as you would with a zinc coating. Unfortunately, 316 stainless often becomes slightly magnetic after spraying. The magnetic testing method can be used, but you need to be very careful to calibrate the instrument using known coating samples and not just relying on the plastic calibration shims.

Quote:Hi Aturas

There are many portable electronic thickness measuring devices out there. Ideally, the ones using both magnetic and eddycurrent methods would best suit your needs. Select the models that cover your particular thickness measuring range. These devices are good for:

* non-magnetic coatings on ferromagnetic substrates like aluminium on steel
* non-electrical conductive coatings on conductive substrates like ceramic on austenitic (non-magnetic) stainless steel


You will find that these instruments will not work with every coating/substrate combination though. Always calibrate and test on specific coating/substrate materials before relying on their readings.

The measurement of metals on non-ferrous metal substrates is not easily achieved using eddy-current method unless there is a 3:1 ratio in the conductivity between substrate and coating. The calibration of instruments must be carried out using samples of the materials with known thickness. Such instruments do not use the normal calibration characteristics and would have to be specially made for the specific coating and substrate.

Regards Gordon
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  WC-CO-CR hvof coating thickness measurement on Base SS 316L JRB VIRANI 3 1,152 06-20-2019, 09:16 AM
Last Post: loriolo
  Coating Thickness Measurement Equipment Taz 1 1,241 01-09-2019, 07:46 PM
Last Post: Lemster68
  Abradable Coating Thickness limitation wasif 1 2,656 07-28-2015, 10:57 PM
Last Post: Johnny_Blaze
  The thickness of coating minh_8888 5 4,937 03-25-2015, 10:31 AM
Last Post: Dr.Boris A.Eizner
  Drum Thickness Coating Requirement for SS316. samshah 0 1,894 11-13-2014, 04:56 PM
Last Post: samshah
  APS and HVOF coating testing Oeno 5 4,178 02-24-2014, 09:37 PM
Last Post: KevinS
  coating thickness Brent 7 5,636 03-09-2013, 11:56 AM
Last Post: sreenuvundela
  uneven Wc coating thickness Brent 5 5,008 01-20-2012, 04:13 AM
Last Post: KevGarty
  Vicker's Hardness testing complete method for copper(thickness 0.07mm to 0.28mm) Boopesh 1 7,599 02-24-2011, 07:01 PM
Last Post: Gordon
  Peel of coating during pressure testing raviswanadha 6 7,284 01-14-2011, 08:49 PM
Last Post: Gordon
  COATING THICKNESS GAUGE ehasan 3 4,600 01-14-2011, 08:07 PM
Last Post: Gordon
Cool Instrument to check coating thickness of Thermal Barrier Coatings odski0317 5 15,288 12-01-2010, 10:09 AM
Last Post: dienngothe
  Coating Thickness Met.Eng. 2 3,391 12-01-2010, 04:17 AM
Last Post: omcblacksmith
  ferrous coating thickness gauge ehsan 1 3,440 04-27-2009, 04:15 PM
Last Post: Gordon
  testing of abradable coating wasif 4 7,994 03-19-2008, 03:51 PM
Last Post: Gordon



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd