×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Corrosion resistance of PVD coatings ?

Corrosion resistance of PVD coatings ?

Corrosion resistance of PVD coatings ?

(OP)
Can somebody tell how corrosion resistance is a PVD coating ? Can it withstand a salt spray resistance test (ASTM B117) of 2000 hours ? Which PVD coating (TiN, CrN, AlTiN, etc.) is best suited for a good corrosion resistance and what should be the coating thickness ?

RE: Corrosion resistance of PVD coatings ?

CrN has the best corrosion resistance and oxidation resistance but the worst wear resistance.  For the best wear resistance use a TiCN coating.
Not sure of salt spray test data as it is not a regular test used for coating assessment.

RE: Corrosion resistance of PVD coatings ?

My obervations on PVD coatings:
- PVD coatings generally used for wear resistance (e.g. TiC, TiCN, Alumina, CrN, etc).  We have seen wonderful wear resistance of 3to5 micron thick CrN in metal stamping operations.  CrN on die steel outperformed TiN in that particular situation.
- re. corrosion: most ceramic are very resistant to corrosive environments.  Obviously the selection of a psecific materials requires other considerations.  A major problem I have seen was the microstructure of the PVD coating - porpous/columnar defects, etc.  If you ca get dense (pore/coulmnar free) coating, it should resist salt spray test.
- thickness? most PVD coatings are produced under 10 microns.  Maybe multiulayer thick coatings should do the job.
- why PVD an why not other coating techniques?

Good luck

Chinnia

RE: Corrosion resistance of PVD coatings ?

If you require a combination of wear resistance and corrosion resistance I would suggest a multilayer PVD  CrN/NbN coating.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources