The general corrosion behavior of T22 material steam generator tube was studied in the simulating water chemical environment of secondary loop of high temperature gas cooled reactor. The results show that

the general corrosion of T22 material was inhibited to a certain extent by increasing the solution pH value and reducing the concentration of hydrazine. With the increase of reaction temperature

the general corrosion rate of T22 heat pipe was accelerated. In the high-temperature and high-pressure water chemical environment

Fe3 O4 oxide film was formed on the surface of T22

and Fe3 O4 grain size and compactness of oxide film increased significantly with the extension of reaction time

leading to a significant decrease in T22 general corrosion rate

which decreased to 0.016 0 g/（m2·h） after 768 hours’ reaction.