Metal surface charge change due to deformation

Abstract

Deformation potential for one dislocation and dislocation pile-up in a thin surface layer was examined. It is shown that the deformation potential changes the electron work of exit, the surface charge of metal and the structure of the double electrochemical layer. The differential capacity method was used as the principal method of measuring the metal surface charge. The plastic strain increases the positive charge of the metal surface. This effect reached a maximum according to successive stages of strain hardening. The zero-charge potential of the metal surface was shifted towards negative values by the amount of the deformation potential, with the formation of an internal double layer in the metal. For example, this shift achieved the value of −0.16 V in the case of iron in 0.1 N H2SO4.