[en] It has been investigated theoretically the corrosion phenomena of iron (Fe) in liquid lead (Pb) by molecular dynamics methods. The corrosion phenomena was regarded as a diffusion process in which the Fe atoms of bulk material spreading into a liquid Pb. The D diffusion coefficient of the corrosion was calculated. We reported the self-diffusion coefficient of Fe in liquid Pb is D_MD (750 deg.) = 2.59x10^-9m²/s. This is in the range of (1.31-5.75)x10^-9 m²/s from literature and also closed to D_Robertson(750 deg. C) = 2.74x10^-9 m²/s based on the Robertson curve.