| 摘要 |
PROBLEM TO BE SOLVED: To confirm whether a sacrificial anode has a function satisfying a necessary protective current under influence of AC induction or not, or whether the sacrificial anode has a sufficient AC induction reduction effect or not, when grasping a cathode corrosion protection state of a structure placed in the state of cathode corrosion protection by a sacrificial anode system. SOLUTION: This system is equipped with a current measuring means 11 for measuring a current flowing in a wire connected between the sacrificial anode and a metal structure, and an operation processing means 12 for performing operation processing of a measured value measured by the current measuring means 11. The operation processing means 12 is equipped with a measured value extraction means 12A, a DC current density calculation means 12B, an AC current density calculation means 12C, a commercial frequency identification means 12D, and a cathode corrosion protection state evaluation means 12E. When the commercial frequency identification means 12D confirms to be a sine wave having a unit measuring time as a period, the cathode corrosion protection state evaluation means 12E determines whether or not the maximum value in a measuring period of an AC current density exceeds a reference value set by using a phenomenon that function decline is generated in the sacrificial anode 2 by AC induction as a reference. COPYRIGHT: (C)2009,JPO&INPIT
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