Browse Prior Art Database

Acid Chrome Etchant

IP.com Disclosure Number: IPCOM000086215D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

McBride, DG: AUTHOR

Abstract

An improved acid chrome etchant is comprised of a base solution made up of 0.5M of CrCl(3) in 0.5M NaH SO(4). Approximately 80 milliliters of this solution is combined with 2 milliliters of a concentrated sulfuric acid and about 0.25 gram of a wetting agent. The resultant etchant solution is heated to 60 degrees C. In application, the speed of etchant may be tailored to any desired level by varying the temperature of the etchant and the concentration of sulfuric acid.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Acid Chrome Etchant

An improved acid chrome etchant is comprised of a base solution made up of 0.5M of CrCl(3) in 0.5M NaH SO(4). Approximately 80 milliliters of this solution is combined with 2 milliliters of a concentrated sulfuric acid and about
0.25 gram of a wetting agent. The resultant etchant solution is heated to 60 degrees C. In application, the speed of etchant may be tailored to any desired level by varying the temperature of the etchant and the concentration of sulfuric acid.

Any common wetting agent may be used in the solution and it is possible that hydrochloric acid, HCl, can be substituted for the sulfuric acid, so long as the HCl is not undesirable in the particular application.

This is an improved etchant which does not etch copper, but does etch chrome. Since it is acidic, it does not attack positive resists, thus making it possible to attain good resolution of fine lines and spaces in metallized ceramic and related applications.

1