In a centrifugal pump (10) for liquids comprising an impeller casing (50) inside which a centrifugal impeller (40) is rotatably mounted including a hub (42) from which a plurality of curved blades (44) delimited by two curved edges (44a,44b) extend, from one of the curved edges (44a) of the curved blades (44) a tab (48) extends on the side of the concavity of the blades (44) and is folded in the opposite direction to the blade (44) with respect to a radial plane.