| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to predict the danger of generation of a corrosion of a metallic piping, etc., by measuring a potential change of a metal because of the adhesion of stains essentially consisting of microbes and an oxidation property change of water. SOLUTION: A test water is supplied from a water feed pipe 1, branched, guided to A, B lines and regulated by a constant flow control valve 2 to be a constant flow rate. A metallic electrode 3a and a reference electrode 4 are inserted to a column 5 of the line A, and an electrode 3b and a reference electrode 4 of the same shape, the same structure are inserted to a column 5 of the line B. The line B is also provided with a filter 6 to eliminate stains and prevent the stains from adhering to the electrode 3b. A potential change of the electrode 3a, 3b is measured by a potential measurement device 7 on the basis of the reference electrode 4, and the presence/absence of a corrosion, a cause of the corrosion are estimated from potentials of the electrodes 3a, 3b. When the potentials of the electrodes 3a, 3b both change constantly and stably, there is no danger of a corrosion. When only the potential of the electrode 3a increases, stains essentially consisting of microbes adhere. When both potentials of the electrodes 3a, 3b increase, both lines are corroded and dangerous because of an increase of an oxidation property in a system.
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