Abstract: N80 steel sheet was polished and then modified by fluorination with 1H,1H,2H, 2H-perfluorodecyltriethoxysilane, and the effect of fluorination modification on the corrosion resistance of the test steel in 3.5wt% NaCl solution and anti-scaling performance in simulated seawater was studied. The results show that after immersion in NaCl solution for 7 d, the surface corrosion of the fluorination modified specimen was the lightest, and the low frequency (0.01 Hz) impedance modulus was 450 Ω·cm², which was much larger than that of the unpolished and polished specimens. After seven-time rapid evaporation scaling tests, the scaling amount of the fluorination modified specimen was reduced by about 42.55% and 37.00% those of the unpolished and polished specimens, respectively. After 35-day of multi-field coupling scaling test, there was no obvious scaling phenomenon in the fluorination modified specimen, and the scaling amount was close to 0. Fluorination modification could improve the corrosion resistance and anti-scaling performance of N80 steel.