Process Monitor for Ferric Chloride Etchant
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Ferric chloride solutions are used to etch stainless steel for a variety of applications, e.g., the fabrication of print bands. Knowledge of and control of the concentration of the active etching species in the bath, ferric ion, is necessary to achieve uniform results. The following describes a method of measuring and controlling the composition of ferric chloride etchants.