Abstract
Monocrystalline nickel with a (110 surface orientation was deformed during rolling in liquid nitrogen in a low-temperature rolling installation. The degree of deformation constituted 9, 23, 40 and 83 per cent. Plarization curves of deformed single crystal nickel showed that anodic oxidation processes depend on the degree of metal deformation. With the increase in degree of deformation the transition of monocrystalline nickel to the passive state is facilitated. It is evident from the deceleration of the dissolution rate in the region of the active state of the surface, from the decrease of critical passivation current as well as from the shifting of critical passivation potential towards the less noble values. Electron microscopic investigation has shown that the growth of the deformation degree results in an accumulation of faults in the crystal lattice. The growth of single crystal nickel susceptibility to passivation with the increase of deformation degree can be explained by the fact that growth of dislocation density leads to the increase of the number of nickel-oxygen compounds formation centres.
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