Patent ID: 9677992
Date: 2017-06-13
CPC Classifications: C02F,C23F,F24D,F24H,G01N,Y10T

Claim:
1. A facility apparatus comprising: a circulation path through which a solvent circulates; a liquid feeding pump that supplies a corrosion inhibitor to the circulation path, the corrosion inhibitor inhibiting corrosion of an anticorrosion target material forming the circulation path; a detection electrode that reacts with the corrosion inhibitor dissolved in the solvent and forms on a surface thereof an electrode surface film which inhibits corrosion, the detection electrode is made of a material that is a same metal material used for the anticorrosion target material forming the circulation path; a counter electrode that is disposed so as to face the detection electrode with a predetermined distance therebetween; an AC power supply that applies an AC voltage with a predetermined frequency and a predetermined voltage between the detection electrode and the counter electrode; and a controller that controls an operation of the liquid feeding pump on a basis of a change in impedance of the electrode surface film formed on a detection electrode surface at a time when the AC voltage with the frequency of less than 1 kHz and more than 1 Hz is applied between the detection electrode and the counter electrode, wherein the controller is configured to obtain, in advance, an impedance at a time when the electrode surface film of the detection electrode is in a pining initiation state, as a lower limit, and start the liquid feeding pump when the impedance of the electrode surface film formed on the detection electrode surface falls below the lower limit.