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The electrochemical atomic force microscope (ECAFM) is an advanced, in-situ technique enabling synchronous measurements of local electrochemical potential and imaging three-dimensional structure and morphology of metal surface with an extremely high resolution up to nano-scale.An ECAFM is typically composed of several pieces of well-integrated components, including an AFM unit, an electrochemical potentiostat and a versatile environmental chamber.The high spatial resolution that can be typically achieved in AFM is able to easily distinguish the various microstructures, which usually have nano-scale dimensions, present in metals, and thus, to precisely monitor the early-stage of corrosion as well as its growth.The potentiostat will enable electrochemical control, as well as measurement of the electrochemical responses during corrosion reactions.