| 摘要 |
PURPOSE:To stably prevent corrosion by providing a gaseous hydrogen discharge part to a polyvalent cation shielding membrane for isolating a liq. from a sacrificial anode main body, holding a metal ion and its hydrate in the membrane, and discharging hydrogen generated. CONSTITUTION:The sacrificial anode main body 2 electrically connected to a metallic can body (not shown in the figure) through a wire 1 is isolated from a liq. by the polyvalent cation shielding membrane 3 which is permeable to water, OH<->, H<+>, etc., and impermeable to a metal ion. Consequently, the metal ion and its hydrate eluted from the sacrificial anode main body 2 are held in the membrane, and the contamination of the liq. is prevented. The gaseous hydrogen discharge parts 4 are fixed to the polyvalent cation shielding membrane 3 through a fastener 5. The gaseous hydrogen discharge part 4 is preferably formed with a polymeric material having water-repellent micropores or a polymeric material having micropores covered with a membrane permselective only to gas. Consequently, the hydrogen generated in the membrane is discharged, and the contact of the liq. with the sacrificial anode main body 2 is facilitated. |
