Abrégé

An aqueous electrolyte solution including a concentration of citric acid in the range of about 1.6 g/L to about 982 g/L and an effective concentration of ammonium bifluoride (ABF), and being substantially free of a strong acid. Methods of treating the surface of a non-ferrous metal workpiece include exposing the surface to a bath of an aqueous electrolyte solution including a concentration of citric acid less than or equal to about 300 g/L and a concentration of ammonium bifluoride greater than or equal to about 10 g/L, and having no more than about 3.35 g/L of a strong acid, controlling the temperature of the bath to be greater than or equal to about 54 °C, connecting the workpiece to the anode of a DC power supply and immersing a cathode of the DC power supply in the bath, and applying a current across the bath.

Classes IPC  ?

• C25F 3/02 - Attaque de surface
• C25F 3/08 - Attaque de surface des métaux réfractaires

Abrégé

A method of removing hydrogen from the surface of a non-ferrous metal workpiece, including exposing the surface to a bath of an aqueous electrolyte solution including a concentration of citric acid from about 1.665 g/L to about 982 g/L and a concentration of ammonium bifluoride less than or equal to about 360 g/L, and being substantially free of a strong acid; controlling the temperature of the bath to be about -2 °C to about 90 °C; connecting the workpiece to the anode of a DC power supply and immersing a cathode of the DC power supply in the bath; and applying a current across the bath at a voltage and a current density measured as current per surface area of the workpiece.

Classes IPC  ?

• C25F 3/26 - Polissage des métaux lourds des métaux réfractaires

Abrégé

An aqueous electrolyte solution including a concentration of citric acid in the range of about 1.6 g/L to about 982 g/L and an effective concentration of ammonium bifluoride (ABF), and being substantially free of a strong acid. Methods of micropolishing a surface of a non-ferrous metal workpiece including exposing the surface to a bath of an aqueous electrolyte solution including a concentration of citric acid in the range of about 1.6 g/L to about 780 g/L and a concentration of ammonium bifluoride in the range of about 2 g/L to about 120 g/L and having no more than about 3.35 g/L of a strong acid, controlling the temperature of the bath to be between the freezing point and the boiling point of the solution, connecting the workpiece to an anodic electrode of a DC power supply and immersing a cathodic electrode of the DC power supply in the bath, and applying a current across the bath.

Classes IPC  ?

• C25F 3/04 - Attaque de surface des métaux légers
• C25F 3/08 - Attaque de surface des métaux réfractaires