| 摘要 |
<p>In a process to de-scale water pipes and tanks, a copper or stainless steel cathode electrode is introduced and coupled to a 6-12 volt direct current. The interior metal face of the tank functions as the anode. The subsequent electrolysis of water separates calcite, while the H +>ions released at the anode lower the pH, slightly dissolving the innermost layer of limescale which is liberated from the boiler inner face. Following its release from the boiler face, the encrustation falls away and may be completely removed by filtration or sedimentation. An electrode (4) is introduced to the center of a metal boiler tank (1) whose inner face is encrusted with water-soaked limescale (2) and containing calceous water (3). The electrode is connected to the negative side of a 6-12 volt d.c. supply to become a cathode, while the positive side is connected to the boiler metal wall to become an anode. The voltage (6) and current (5) are monitored by suitable instruments. Electrolysis splits water into hydrogen and oxygen. A concentration of OH ->ions is liberated at the cathode, combining with the Ca 2>+>ions present in solution to form and liberate calcite, reducing the calcite level present in water. The H +>ions liberated at the anode and boiler inner wall react with the HCO 3>->ions present in the water to carbonic acid and dissolved free CO 2, sharply lowering the pH value and liberating the limescale from the boiler wall.</p> |
