finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsBooksHelpWantedAdvertiseForum
topic 7900

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, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.