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
-----

Coating Problem In Chrome

2001

Dear Readers,

We are using Atotech's CR 843 chrome salt for plating chrome over pen parts after satin nickel. Of late we have observed that despite recommendation from Atotech to keep sulphate to chromic Acid ratio of 200:1, we face the problem of chromic acid getting coated on the surface. When we increase the sulphate content the burning of the parts starts. The Hull cell panel shows a throw of 80 mm. The temp. of the bath is 40 °C.

Can somebody throw more light on this.

SHAILENDRA
- India

Since this problem has developed "of late", I would suspect some kind of contamination problem--most likely iron, trivalent chromium, or chlorides. Technical service should be available for this proprietary bath; but a chrome plating consultant can help if the location is remote and the supplier truly can't.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

(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: