NMFRC
 

NCMSCompliance Assistance Centers

Funded by EPA
through a Cooperative Agreement

EPA

Disclaimer
The information contained in this site is provided for your review and convenience. It is not intended to provide legal advice with respect to any federal, state, or local regulation. You should consult with legal counsel and appropriate authorities before interpreting any regulations or undertaking any specific course of action.

Ask the Expert Question-and-Answer Archive
(Hard Chrome Plating)

by Larry Zitko, ChromeTech, Inc.
September, 2002

Determining if an Object is Chrome Plated

Q. First, how do we determine whether or not object is chrome plated? Second, is there a simple test to determine if plating is truly hard chrome?

A. Question 1:
If you are only dealing with chromium electrodeposits, and you merely wish to detect the presence or absence of the chrome on carbon (not stainless) steel, you can swab the cleaned region with a Blue Vitriol solution. It is made by dissolving enough copper sulfate in water to make up a strong solution (I don't think the exact concentration is critical), then adding a small amount of sulfuric acid to make the solution acidic. Unplated regions will turn a copper color, while chromium plated areas will retain the silvery chromium appearance.

Question 2:
If you wish to identify whether the deposit is chromium, you can place it in contact with warm, concentrated hydrochloric acid. Chromium will form a greenish film as it is immersion stripped by this solution.



| Compliance Assistance | Regulations | Directories | Resources | Hot Topics | News | Ask the Experts | Library | Online Training | About NMFRC | Search | Home |

NMFRC