| 摘要 |
PROBLEM TO BE SOLVED: To realize an efficient and inexpensive cathode protecting method in a high resistance soil environment low in a water content and suitable for a nonelevated tank made of steel. SOLUTION: By adding organic phosphonic acid and zinc chloride to the inside of fundamental soil, at the time of flowing the corrosion protecting current, an insoluble film composed of phosphorous and zinc is deposited on the whole face of the contact face between a tank borrom board 71 and the fundamental soil 83 in a short time, the speed of the cathode polarization of the tank bottom board 71 is promoted, the required corrosion protection maintaining current is reduced, as well, and, moreover, the resistivity of the fundamental soil 83 is reduced, by which the efficiency of the cathode protecting method is improved. |
