Objective Cathodic electrodeposition technique was employed for improving the corrosion resistance of typical tube inner structure. Methods Electrochemical impedance spectroscopy (EIS) was coupled with salt spray test and filiform corrosion method to investigate the effects of applied voltage and bath temperature on the corrosion resistance of the coatings. Using accelerated corrosion test methods, the corrosion resistance of the coatings after the improvment of anticorrosion was evaluated. Results All the electrophoresis paint films showed rust in the scratch when the neutral salt spray test was conducted for 480 h. The test result showed only for 4# coating (applied voltage 350 V and bath temperature 34. 9 ℃ ), no rust expanded in the scratch of the test sample after salt spray test for 2000 h. The filiform corrosion resistance of all the electrophoresis paint films could meet the requirement of MIL-PRF-23377J. After immersion in 3. 5% NaCl aqueous solution for 2000 h, 4# coating possessed the maximum impedance value of 6×1010 Ω·cm2 , while 3# coating (applied voltage 350 V and bath temperature 34. 3 ℃ ) possessed the minimum impedance value and the impedance value changed from 6×1010 Ω·cm2 at the early stage of immersion to 9×107 Ω·cm2 . It indicated that all the films produced by the four electrocoating processes showed good corrosion resistance, while 4# coating possessed the best corrosion resistance. The results showed that the optimal process parameters of tube inner structure were applied voltage 350 V and bath temperature 34. 9 ℃ . The life period of the coating could be increased by over 40 times if irrigation film was replaced by electrophoresis paint film. Conclusion The corrosion problem of typical tube inner structure could be solved by cathodic electrodeposition technique which improved the anticorrosion performance of the holllowed structure.