APPARATUS FOR MEASURING AMOUNT OF HYDROGEN PENETRATED INTO METAL

Provided is a measuring apparatus capable of accurately measuring an amount of hydrogen penetrated into a metal due to corrosion, in consideration of changes in residual electric current on the anode side that accompany changes in environmental temperature. In the apparatus, a specimen formed of a metallic material has one surface exposed to a corrosive environment so as to serve as a penetration surface of hydrogen generated by a corrosion reaction while having the other surface as a hydrogen detection surface. On the hydrogen detection surface side, an electrochemical cell constituted of a group of a plurality of cells is disposed, and the cells in the cell group each being filled with an electrolyte aqueous solution having a pH of 9 to 13 and having a reference electrode and a counter electrode independently disposed therein. At least one of the plurality of cells in the cell group is configured as a base cell for compensating a residual electric current, the base cell having a protective film formed on a region on the hydrogen penetration surface side corresponding to a hydrogen detection region thereof for the purpose of cutting off a contact with a corrosive environment, so that anodic current values detected in other cells than the base cell are compensated based on the residual electric current value detected in the base cell, and an amount of hydrogen penetrating from a corrosive surface side is calculated based on the compensated anodic current values.