Abstract: With the continuous development of the automobile industry, people′s requirements for automobiles are becoming more and more strict. On the one hand, traditional fuel vehicles will face the stringent requirements of fuel consumption of 100 kilometers; on the other hand, new energy vehicles will also bear battery life. The mileage challenge, both of which are closely related to the weight of cars. Therefore, the demand for lightweight vehicles is very urgent and has become an important development trend in the automotive industry in the future. The choice of materials is the key to lightweighting. Carbon fiber has excellent specific strength, specific stiffness and other properties, and has excellent lightweight performance. Carbon fiber composites are used on body structural components, which not only reduce the weight of the car, but also provide reliable pedestrian protection and safety. Therefore, the discussion of the interaction between electrophoretic coating and composite materials has important research significance in the development of lightweight automotive structural parts. In this paper, the interaction between composite materials and electrophoresis bath was studied by electrophoretic coating of composite samples. The study on the influence of composite materials on electric swimming pool bath and the effect of electrophoretic coating on the properties of composite materials. Thus, at the material level, the applicability of carbon fiber composite materials in the field of lightweight automotive structural parts is demonstrated.

Key words: automotive structural parts, lightweight, carbon fiber, composite materials, electrophoretic coating