Uncertainty studies of topographical measurements on steel surface corrosion by 3D scanning electron microscopy

► Uncertainties in measurements on the topographies of corrosion pits from 3D SEM images were studied. ► Reliable values of pit depths were obtained even at magnifications as low as 100×. ► Orthopedic implant samples under different surface treatments showed difference in pit depth. ► These results are in agreement with electrochemical measurements.