Patent ID: 8877084
Filing Date: 2014-11-04
Classification: C23F,C23G,H01L

Abstract:
1. A method for refreshing an acid bath solution comprising: a. determining a concentration of phosphoric acid in as sample of the acid bath solution via titration; b. determining a concentration of hydrochloric acid in the sample of the acid bath solution via titration; c. 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 based upon the concentration of the phosphoric acid; d. calculating a volume of hydrochloric acid to add to the acid bath solution with the volume of phosphoric acid based upon the concentration of the hydrochloric acid to increase the acid bath solution to a predetermined volume; and e. adding the volume of phosphoric acid and the volume of hydrochloric acid to the acid bath solution.