In order to solve the environment problem caused by the inhibitors that are widely used to improve the corrosion and scaling of the carbon steel pipes and equipment in the transportation of the industrial water, the design of using coatings or films on carbon steel is put forward without adding inhibitor. Based on this design, the Ni3P-TiO2 coatings have been prepared on carbon steel by chemical plating and sol–gel method. The coatings mainly compose of Ni3P and TiO2 analyzed by the XRD patterns. The microstructure and morphology of the Ni3P-TiO2 coatings are full, smooth and no cracks using a scanning electron microscopy. The properties of the Ni3P-TiO2 coatings are determined through the electrochemical experiment, scaling inhibition and antibiosis experiment. The results demonstrate that the coatings have the excellent properties of anticorrosion, scaling inhibition and antibiosis. The mechanism of the efficiency maybe due to the change of the interfacial energy, but it need prove through the farther examination.