Corrosion prevention apparatus and corrosion prevention method for cut faces of pipes

A corrosion prevention apparatus for cut faces of pipes, comprising:

• a telescopic double tubular member accommodated in an outer case that is mounted such as to surround an outer circumferential surface of a fluid pipe, and placed from above between a pair of cut faces formed by making a full cut of the fluid pipe,
• the double tubular member including an anti-corrosion member that faces the pair of cut faces of the pipe and a core member to be inserted into the anti-corrosion member from above, and the double tubular member being configured such that the anti-corrosion member expands radially by the core member being inserted into the anti-corrosion member, so as to be pressed against the pair of cut faces of the pipe,
• the anti-corrosion member having a through hole that communicates with the fluid pipe, and a flange positioned above the through hole and extending radially outward, and
• the flange having an abutment surface that abuts on an outer circumferential surface of the fluid pipe, the abutment surface being curved along the outer circumferential surface of the fluid pipe.