chrome oxide coating failure - 24" dia. steel roll
07-04-2012, 08:51 PM,
chrome oxide coating failure - 24" dia. steel roll
We are having premature roll failures in our cleaner bath on our tin mill. We use suppliers to apply a chrome finish on our rolls. We build up the roll based on drawing specs to a O.D of about 24", we send the roll to one supplier for chrome plating and another supplier for chrome oxide coating.

We are seeing blistering in the middle of the roll followed by chrome flaking. Oddly, only the center of the roll has the thin band (2"-3" wide) where the chrome plating is failing. Roll width is a maximum 45".

Our colleagues in another tin mill claim this is a sign of poor roll surface preparation. However, I have not had feedback from this colleague on what "poor surface preparation" means. What standard should I hold my suppliers to if I want a chrome oxide surface coating for this roll, in a caustic cleaner bath? Has anyone had a better experience with another surface coating in this application? The chrome oxide coated rolls are lasting anywhere's from less than a month to about 3 months, but not more.
07-05-2012, 08:34 AM,
RE: chrome oxide coating failure - 24" dia. steel roll
If i had to guess I would say the surface was contaminated with something. Is the acid bath being checked for contamination and the right concentration?
07-06-2012, 09:09 PM,
RE: chrome oxide coating failure - 24" dia. steel roll
I understand that chrome oxide coating is being done over hard chrome plating. Hard chrome plating has a hardness of 55 HRC, so probably a decent surface profile is not being created prior to coating it with chrome oxide...this is what your colleagues may mean by " poor surface preparation"
Also, is the chrome oxide coating being plasma sprayed or spayed using Rokide?

07-10-2012, 02:37 PM,
RE: chrome oxide coating failure - 24" dia. steel roll
We use to coat zincroll with HVOF and chrome oxide, without any problem, but it's important to apply a sealcoat on the coating.
Best regards

Possibly Related Threads…
Thread Author Replies Views Last Post
Shy HVOF Coating Calender Roll issues. Suggestion needed tobjung 4 1,638 07-24-2021, 08:53 AM
Last Post: tobjung
  Hardness increase in Chrome Ceramic Plasma Coating DMan 6 1,930 03-25-2021, 01:24 PM
Last Post: DMan
  Ra value 1.6 to 1.7┬ÁM in CGL POT Stabilizer roll Packiaraj Mutharasu 3 2,267 02-28-2020, 08:44 AM
Last Post: Vadim Verlotski
  Chrome Oxide Hardness Neufeld 1 1,790 02-18-2020, 09:25 PM
Last Post: Lemster68
  bridal roll coating rmsengineering 0 1,358 12-15-2019, 02:31 PM
Last Post: rmsengineering
  Chrome-Carbide coating issue DanyGans 11 8,491 10-08-2019, 05:19 PM
Last Post: Lemster68
  oxide cluster in NiCrAl plasma coating Zhiguo 5 6,618 09-26-2018, 04:48 PM
Last Post: bpls670
  Defect Missing Material and Coating Failure achmadarifudinh 2 2,785 02-12-2018, 05:47 AM
Last Post: achmadarifudinh
  Hearth roll coating kim jong hun 2 3,061 10-12-2017, 09:11 AM
Last Post: kim jong hun
  Surface hardening [steel + steel alloys] haggis 1 2,957 07-09-2017, 12:42 PM
Last Post: plasmajet1990
  Un-common surface pattern on coating failure shantanu 2 2,974 10-06-2016, 02:55 PM
Last Post: Vig
  Cr2O3 coating failure specialized 5 4,894 08-23-2016, 02:29 PM
Last Post: specialized
  Bonding coating for Cast steel subsrate plzc126330 5 4,677 08-15-2016, 09:01 AM
Last Post: plzc126330
  WC/Co/Cr on Stainless steel 420 coating Arturas 2 3,637 06-01-2016, 03:53 PM
Last Post: shantanu
  abradable coating failure stvon 11 7,712 11-17-2015, 12:33 PM
Last Post: Joris Kraak

Users browsing this thread: 1 Guest(s)

Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd