Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

pub
Free personalized metal finishing help!


Zinc trivalent blue passivation in crs gets white rust



(-----) 2007

The plating thickness is 8-12 Microns and salt spray test also pass 72 hrs but after 14-15 days the comp will getting white rust so please suggest solution.

If there any problem in cyanide/non-cyanide bath concentration.

Prem Kumar
Employee - Karnataka, India
^


2007

Decidedly, it is a problem of passivation or post-treatment. Especially, incorrect the pH or concentration. When it comes to post-treatment, pay your attention on rinsing or drying. Rinse water is often too acidic and it may cause real damages of passivation layer during drying. Some trivalent passivations need drying in really hot air and then conditioning 24 hours before operating. If not - the corrosion resistance is significantly reduced.
Best regards,

Janusz LABEDZ
- Warsaw, Poland
^


2007

Hi there,

please check the drying of the component, secondly the porousity of the base material and thirdly the packing material and lastly note the storage components are away from the plating zone where there is lot of acidic fumes.

Regards

praveen kumar
Praveen Kumar
plating process supplier
Mumbai, India

^

adv.    saify ind banner

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    -    ©1995-2022 finishing.com, Pine Beach, New Jersey, USA