No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Balanced Chemistry of Chrome Plating Bath

I am using single catalyst chrome plating in my industry. I am using the following chemistry for my bath.
Chromium - 250 g/lit
chrome:sulphate ratio - 90:1
current - 30 amp/dm2
We derived this chemistry after conducted many trials. But we still getting milky deposit and uneven thickness. Can you sugges me balanced chemistry and current density for better quality as well as performance.

V. Ranga Bhuvana Balaji
Process Shop - Medchal, Andra Pradesh, India

You fail to mention temperature which is as critical as the parameters mentioned.

James Watts
- Navarre, Florida


Dear Balaji,

I think everything seems to be ok. EXCEPT

1. Temp - you did not mention try maintaining at 55 Deg C
2. How about trivalent levels
3. How about metallic contaminations
4. Try slightly higher current density
5. Remember hard chrome does not use brighteners so a polished surface comes out brighter than an unpolished one.
So you see there are more things important other than 250 gm/l CrO3, and 90:1 chrome sulphate ratio.
I think all above points if correctly maintained should give a fairly bright deposit.
All the best,

vikram dogra
Vikram Dogra
Irusha India - Chandigarh, India

Thanks for your response. Actually I am running my bath in 60 °C.
Mr. Vikram I will give the mentioned details next week after completing my bath analysis. And one more thing that I feel efficiency is less. Do you know the procedure to Calculate the Cathode Efficiency.

V. Ranga Bhuvana Balaji
Process Shop - Medchal, Andra Pradesh, India

(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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact  -  Privacy Policy  -  ©1995-2024, Pine Beach, New Jersey, USA  -  about "affil links"