| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for preventing a scale from adhering, which completely prevents a cation from precipitating to adhere to a metal-made protection object such as a submergible pump and further can control in a state of preventing the scale from adhering conforming to the present condition of water, without wasting and most suitable even in a drainage tank frequently flowing in or discharging, and an apparatus used therefor. SOLUTION: The metal-made protection object 2 and an immersion electrode 3 are oppositely placed in a non-contact state in a low-conductivity liquid 1, in a state of connecting a plus side output terminal 7 of a direct current power supply to the metal-made protection object 2 and a minus side output terminal 8 to the immersion electrode 3, the direct current power supply is supplied to electrically charge the metal-made protection object 2 with a plus and the immersion electrode 3 with a minus, and the action of electrical repulsion is generated between a cation 13 to be electrically charged with the plus and dissolved in the low-conductivity liquid 1, and the contact liquid surface of the metal-made protection object 2 to be charged with the plus. COPYRIGHT: (C)2006,JPO&NCIPI
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