| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure an amount of hydrogen invasion into metal upon corrosion, while considering a change in a residual current on an anode side induced by environmental temperature change.SOLUTION: One side of metal material as an analyte is set as a hydrogen invasion surface, the hydrogen being generated by a corrosion reaction after being exposed to the corrosion environment, and the other surface thereof is set as a hydrogen detection surface, and then a hydrogen flux which diffuses in the hydrogen detection surface while a potential on the hydrogen detection surface side is held at -0.1 to +0.3 VvsSCE, is measured as an anode current. An electrochemical cell composed of a plurality of cell groups are arranged on the hydrogen detection surface side of the same analyte, and each of the cell groups is filled with an electrolyte aqueous solution having a pH of 9-13 and in each of the cell groups, independently provided reference electrode and counter electrode are installed. At least one cell is set as a reference cell to correct a residual current, and in a portion on the hydrogen invasion surface side corresponding to the reference cell, a protection film is provided to block the hydrogen invasion. Then, an amount of hydrogen invasion from the corrosion surface side is calculated, on the basis of the anode current value detected in the cells other than the reference cell. |
