By distinguishing the induction period of scaling (IPS)and that of crystallization
a mathematical model was established for IPS of CaCO3 which heterogeneously nucleated on heated surfaces. The relationships between IPS and surface wall supersaturation
surface wall temperature
fluid flow velocity and surface properties were obtained through computation. The surface treatment technique of ion implant nitrogen was used to prepare new surfaces with low surface energy and without additional thermal resistance of metal substrates. The effects of these improved surfaces on IPS were experimentally investigated. It was found that IPS on treated surfaces was 0. 5-1 times longer than that on untreated surfaces.