Concentration of Free Alkali

Question from someone: Could someone please advise their method for titration of the anodizing bath? Free alkali become a tool meter to understand the running of cleaning process or in activation of anodizing surface. The aluminum results derived by calculation from free alkali versus used acid concentration. With regard to maximum concentrations: before beginning work for anodizing process the method should be fixed to analyses this condition.

Good cleaning of the aluminum before anodizing is essential to achieve an attractive finish. Cleaning is usually done in a non-etching alkaline solution. Concentration of alkaline and density, time, temperature, and concentration of the electrolyte during anodizing become parameter on success of anodizing process.