DEVICE FOR DETERMINING AMOUNT OF HYDROGEN PENETRATING INTO METAL

摘要

The present invention addresses a problem of providing a measuring device which can accurately determine the amount of hydrogen that has penetrated into a metal with the progress of corrosion, while taking account of any change of anode-side residual current accompanying a change in the temperature of the environment. One surface of a specimen constituted of a metallic material is used as a hydrogen penetration surface, which is exposed to a corrosive environment and into which the hydrogen that is evolved by a corrosion reaction penetrates, and the other surface is used as a hydrogen detection surface. An electrochemical cell set configured of a plurality of cells is disposed on the hydrogen detection surface. An aqueous electrolyte solution having a pH of 9-13 is packed into each of the cells, and a reference electrode and a counter electrode that are independent of each other are disposed therein. At least one of the cells is used as a standard cell for correcting residual current, and a protective film for avoiding contact with the corrosive environment is disposed in the area of the hydrogen penetration surface which corresponds to the hydrogen detection area for the standard cell. The anode current value detected with each cell other than the standard cell is corrected with the value of residual current detected with the standard cell. On the basis of the corrected anode current value, the amount of hydrogen that has penetrated from the corrosion-surface side is calculated.