activation

in electrochemical corrosion
https://doi.org/10.1351/goldbook.A00094
The process of transition from the passive to the active state by removal of the passivating @F02366@. A necessary condition for @A00093-1@ is an @E01956@ negative to the equilibrium potential of formation of the passivating @F02366@. @A00093-2@ is achieved by cathodic currents, by a reduced substance in the adjacent solution, or by contact with an electronic conductor having a suitably negative @C01357@.
See also:
passive state
,
active state
Source:
PAC, 1989, 61, 19. (Electrochemical corrosion nomenclature (Recommendations 1988)) on page 21 [Terms] [Paper]