Abstract
The small grain size and the high volume fraction of grain boundaries result in significantly different corrosion behaviors between nanocrystalline materials and corresponding coarse crystalline materials. In active dissolution, nanocrystallization accelerates the corrosion reactions. In passivation, nanocrystallization changes the composition of the passive film, improves the formation of compact film, influences the semiconductor property and possesses the different morphology and growth process of passive film. The small grain size influences the passivation depending on fast element diffusion and special adsorbed ability, all of which increase the corrosion resistance of materials. In local corrosion, nanocrystallization increases the unstable points on the surface of the materials, which increases the possibility of local corrosion. However, the excellent ability of element diffusion helps heal the local corrosion points, which inhibits the growth of the local corrosion.
Published Version
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