No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Coating to stop caustic corrosion of SS316L




We have palm size SS316L cast [CF8M?] machined one side, electropolished the other, equipment corroding in the field. These components are not stressed [housing only] but subject to steam/caustic atmosphere up to 300F, unknown concentration. Can we apply a coating to significantly reduce the attack? I was thinking of electroless nickel, NEDOX NH2, etc. Tolerances are not an issue.

Sal Chirico
Honeywell - Vancouver, BC, Canada
2004



2004

Several years ago, Chevron found that a one mil coating of electroless nickel at least delayed caustic stress corrosion cracking of steel bolts in steel condensate service. Prior to plating bolts were failing in as little as 30 days. After plating they lasted for at least one year. With stainless steel, electroless nickel may also provide some galvanic protection.

Ron Duncan
Ron Duncan [deceased]
- LaVergne, Tennessee
It is our sad duty to note Ron's passing on Dec. 15, 2006. A brief obituary opens Episode 13 of our Podcast.




2004

I am interested in this problem. Which side is the corrosion occurring? Machined side only? Was it passivated after machining? You should have good resistance to NaOH/300F steam with CF8M if it did not have some iron on the surface to start with. How long did it take for the corrosion to show up?

Castings can be fickle!

lee kremer
lee kremer sig
Lee Kremer
Stellar Solutions, Inc.
supporting advertiser
McHenry, Illinois
stellar solutions banner




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"