Q&A: Titrating Sulfuric Acid Anodizing Baths
Q: Do you have a recommended analytical method to determine the sulfuric and aluminum concentrations in sulfuric anodizing solutions?
.jpg;maxWidth=600)
Q. Do you have a recommended analytical method to determine the sulfuric and aluminum concentrations in sulfuric anodizing solutions? D.C.
A. Here are three good methods that can be used for titrating the sulfuric acid anodizing electrolyte:
Sulfuric Acid Anodize Titration Procedure:
Principle: One sample is titrated with caustic soda to determine the sum of acid and aluminum. Another is treated with potassium fluoride to precipitate aluminum and titrated to determine acid. The difference is calculated as aluminum.
Reagents: Standard sodium hydroxide solution, 1.0 N. Potassium fluoride solution. Dissolve 50 g KF:2H2O in 100 mL of water and neutralize to phenolphthalein. Store in a plastic container. (KF will etch glass.)
Procedure: Take two separate 10 mL samples, dilute each to about 150 mL with DI or distilled water and add phenolphthalein. While stirring vigorously, titrate one portion with standard caustic to the indicator end point. Record the titrant volume as “A.”
To read more of Larry Chesterfield's answer, please Click HERE:
Related Content
-
Understanding PEO Coatings
Using high-speed cameras and back side illumination (BSI) sensor technology to analyze plasma electrolytic oxidation.
-
NADCAP Shop Digitizes to Eliminate Paper Trail
Customizable ERP software has transformed a 27-year-old manual metal finishing job shop into a state-of-the-art paperless company with full digital traceability in about 10 months.
-
An Interview With Bryan Leiker, Metal Finishers Association of California
Bryan Leiker, executive director for the Metal Finishers Association of California (MFACA), offers an update on actions to counter a proposed ban on hexavalent chromium plating and anodizing operations in the state.
