抄録
GFRP has been used as anti-corrosive material, but severe accidents were reported occasionally. Acid stress corrosion is the one of famous problem for such an application, and has been well studied. The examples of the accident related to corrosion of GFRP were shown and the cause of these accidents was investigated in this study. A GFRP vessel containing 75% H2SO4 and broken only for 1 year was investigated chemically and microscopically. Many cracks were found at inner surface of the vessel and the solution would have been leaked out through these cracks. From FT-IR analysis, it was confirmed that the matrix resin even at inner side was not affected by the solution. From microscopic observation, it seemed that the matrix/reinforcement interface would be debonded and the stress could not be transferred between matrix resin and reinforcement. This debonding was considered as the starting point of cracks. To understand the cause of this kind of accident, the specimen with the similar defects as the actual vessel was recreated. In consequence, it was found the cracks occurred in shot period. Furthermore, it was suggested that the curing condition seriously caused the accident.
