MANUFACTURE OF SEAWATER-RESISTANT AL-COATED STEEL MATERIAL

摘要

PURPOSE:To obtain a metallic material having superior corrosion resistance in the sea or other environment by irradiating laser beams on an Al film formed on a steel material in an oxidizing atmosphere to melt the surface of the Al film and to form a stable Al2O3 layer. CONSTITUTION:An Al or Al alloy film is formed on the surface of a steel material by spraying or other method. Laser beams such as CO2 laser beams are irradiated on the Al film in an oxidizing atmosphere to melt the surface of the Al film and to form a stable Al2O3 layer having high seawater resistance as the top layer. By this method, an Al coated steel material having superior corrosion resistance in brine or other environment and high adhesion is obtd.