| 摘要 |
A method of minimizing corrosion in an iron plumbing system of the non-recirculating type through which water intermittently flows by interposing a magnesium anode therein that is electrically connected thereto to provide a galvanic couple. The magnesium in the anode after transforming from the atomic to the ionic state reacts with dissolved oxygen and carbon dioxide in the water to form soluble substantially non-corrosive magnesium salts. The magnesium anode unless subjected to water at a relatively high velocity tends to become enveloped in a protective film of magnesium hydroxide that renders it passive. By superimposing an alternating electric current on the galvanic cell the magnesium hydroxide is dislodged from the anode as it forms at the water interface, with magnesium dissolving into the water at a maximum rate to maintain the water at a pH of above seven and a maximum electrical potential between the anode and the iron plumbing.
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