Patent Number: 8,877,084

Title: Method for refreshing an acid bath solution

Abstract: A method for refreshing an acid bath solution includes determining a concentration of phosphoric acid in the acid bath solution and determining a concentration of hydrochloric acid in the acid bath solution. The method further includes calculating a volume of phosphoric acid to add to the acid bath solution to achieve a predetermined concentration of phosphoric acid in the acid bath solution. In addition, the method includes calculating a volume of hydrochloric acid to add to the acid bath solution with the volume of phosphoric acid to increase the acid bath solution to a predetermined volume, and adding the volume of phosphoric acid and the volume of hydrochloric acid to the acid bath solution.

Inventors: Zhang; Liming (Greer, SC), Zhou; Hong (Shanghai, CN), Liu; Yanping (Shanghai, CN)

Assignee: General Electric Company

International Classification: C23F 1/46 (20060101)

Expiration Date: 2019-11-04 0:00:00