| Hydrogen influences the corrosion behavior of metals and alloys. However, the mechanism of hydrogen promoted corrosion is still not clear. In this thesis, the effects of hydrogen on the localized corrosion of carbon steel have been studied. The purpose of the present work is to advance the understanding of hydrogen effects on corrosion.; The results show that hydrogen accelerates the nucleation and propagation of pitting of X70 carbon steel. The effect of hydrogen on crevice corrosion is more noticeable than that on pitting. At passive potentials, hydrogen retards the passive film formation and decreases its stability. Hydrogen also increases the donor concentration and decreases the thickness of the space charge layer in the passive film. A new explanation is proposed to explain the effect of hydrogen on the passive film formed on Fe and low carbon steel, which is accordant with the experimental results. |
