Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

The authoritative public forum
for Metal Finishing since 1989
-----

Passivation on aluminum castings

Is it necessary to do passivation ( Cr or Zr ) during pre treatment of aluminum castings for painting , when we are using 3~4 DM water rinses after de greasing and later on applying anti-corrosive primer before painting?

NAVEEN SHARMA
AUTOMOTIVE - GURGAON , Haryana , INDIA
2007

That ALL depends on what quality of a job you desire. A chromate conversion coating is optimum (price vs adhesion) Zinc phosphate and anodize are two other options for pre paint.
Some primers do not like chromate, so check with your prime MFG before you use it.

James Watts
- Navarre, Florida
2007

(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: