No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

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

-----

Clear zinc chromate finish on cast iron

I have an iron sand casting that has some extensive machining done to it. After the maching was complete, it was sent out for a clear zinc chromate finish. The part came back and the machined surfaces were extremely rough, almost like sandpaper. Is clear zinc chromate the correct finish to use for corrosion protection? What caused the finish to become so rough? Is there something special that must be done to cast iron to prevent this roughness? Any help with this problem would be appreciated. The part is approximately 10 inches by 5 inches and 1 inch thick.

James A. Micket
- Rochester, New York
2005

You can try to improve the base metal finish by giving sand blasting. Regarding the corrosion protection, clear chromate will give lower sst life. If you are under ELV regulation then trivalent chromate over zinc cobalt alloy will give sst life of 120 plus hour.

P. Gurumoorthi
electroplating process chemicals - Chennai, Tamilnadu, India
2005

(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: