The invention discloses a control method for coast
atmospheric corrosion resistant scale on the surface of a boat
deck, which belongs to the field of steel for
hull structures. According to the invention, the structure and thickness of scale on the surface of a boat
deck is controlled by optimizing production processes for boat decks. The method comprises the following key points: controlling parameters of
heating temperature, time,
residual oxygen and the like for
continuous casting billets and reinforcing a de-scaling effect once; controlling the index of
chloride ion in water for production, reducing the content of deposited
chloride ions in scale and inhibiting corrosive pitting; controlling initial rolling temperature and finishing rolling temperature in the stage of finish rolling, reasonably utilizing a weak
water cooling system, increasing the content of Fe3O4 in scale, reducing the content of Fe2O3, retaining a small amount of FeO and enabling the scale to have good
plasticity, a bonding force and
corrosion resistance. The advantages of the invention are as follows: it does not need to reconstruct existing equipment, and the surface quality and production efficiency of the boat
deck can be enhanced through technological optimization;
structural composition of the scale is reasonably controlled, which enables the surface of the boat deck to have excellent coast
atmospheric corrosion resistance, especially enables corrosive pitting caused by
chloride ions to be inhibited, and enables the storage duration of the boat deck in coast environment to be prolonged.