| 1 MINUTE READ

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?

Share

Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

�

 

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 Topics

RELATED CONTENT

  • Deoxidizing Aluminum as a Pretreatment

    This important first step can help prepare the metal for subsequent surface finishing.

  • Plating Process Control

    The cornerstone of quality and productivity for any finishing operation, process control is a plater’s key to success. To find out how far techniques have come, where they’re headed in the future, and how platers can raise the bar, Products Finishing convened a panel of experts for a roundtable discussion on the topic. With well over 100 years of combined plating experience, experts Greg Arneson, Art Kushner, Peter Gallerani and Joelie Zak share their thoughts.

  • 2020 Vision: The Future of Coatings

    The year 2020 will be here before you know it, signaling the beginning of a new decade and bringing changes to the world as we know it.