Method for producing electrode for aluminum electrolytic capacitor

A method for producing an electrode for an aluminum electrolytic capacitor, the method comprising:

• a first hydration treatment step of forming a hydrated film onto an aluminum electrode including a porous layer by immersing the aluminum electrode into a first hydration treatment liquid whose temperature is 80° C. or more and a boiling point thereof or less;
• a dehydration step of heating the aluminum electrode in an atmosphere having a temperature of 150° C. or more and 350° C. or less after the first hydration treatment step;
• a second hydration treatment step of immersing the aluminum electrode into a second hydration treatment liquid whose temperature is 80° C. or more and a boiling point thereof or less after the dehydration step;
• and
• a chemical formation step of performing chemical formation of the aluminum electrode in which a voltage of 400 V is applied to the aluminum electrode in chemical formation liquid, after the second hydration treatment step,
• wherein the first hydration treatment liquid and the second hydration treatment liquid have a pH of 5.0 or more and 9.0 or less, and
• at least one hydration treatment liquid out of the first hydration treatment liquid and the second hydration treatment liquid is made by blending a hydration inhibiting agent into water.