Abstract: The thickness detection on the top plate, wall plate and bottom plate of two hydrodesulphurized diesel tanks is made and serious corrosion can be seen at the location of top plate and upper wall plate. Analysis results show that the corrosion is galvanic corrosion by salty atmosphere, aqueous vapor and hydrogen sulfide contained in diesel oil. The control measures are put forward, including zinc and aluminum spraying plus coating materials on top' plate and wall plate.