Presented in Partnership with:

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

by Larry Zitko, ChromeTech, Inc.
March, 2002

Hard Chromium-Molybdenum Plating

Q. I am interested in a prosses marketed as hard chrome containing molybdemum.Is the molybdeum co-deposited with the chrome or is it just another after plating prossess designed to enhance the surface finish of the chrome?I would appreciate any information you can provide on this process and or data to support claims of increased hardness and better ware characteristics.

A. I think you are referring to an alloy plating process in which molybdenum resides in the bath and is codeposited with the chromium. My understanding is that the moly takes the form of a dispersion of molybdenum oxide or trioxide in the chromium deposit.

I have read claims of increased hardness, wear resistance and abrasion resistance (200-300%) for the coating. For maximum wear resistance, the coating is electropolished after plating. For evidence supporting these claims, see pg. 63-64 of "The Properties of Electrodeposited Metals and Alloys - A Handbook, Second Edition", William H. Safranek. This book was published by AESF in 1986.

If you are an STERC subscriber, you can get a fax-back copy of MIL-C-85455, "Military Specification: Chromium-Molybdenum Plating (Electrodeposited)" at It's entry #4325 in the Technical Database.

I hope this helps.




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.

Please note that many of the regulatory discussions on STERC refer to federal regulations. In many cases, states or local governments have promulgated relevant rules and standards
that are different and/or more stringent than the federal regulations. Therefore, to assure full compliance, you should investigate and comply with all applicable federal, state and local regulations.