CORROSION PREVENTION METHOD OF STEEL MATERIAL

摘要

PURPOSE:To provide a corrosion prevention method which displays corrosion prevention properties favorable to a high-temperature steel material and does not necessitate a special heating device for its execution, by a method wherein a tape obtained by sticking the same together with thermosetting resin composite as an adhesive agent layer after applying an undercoating agent to the same is wound round the surface of the steel material through lapping. CONSTITUTION:An undercoating agent composed of two-pack cold-setting type epoxy resin composite is applied to the surface of a steel material and then a corrosion prevention tape constituted by sticking a thermosetting resin composite as an adhesive agent layer and a plastic sheet or rubber sheet together is wound round the steel material through lapping. A quantity of coating of an undercoating agent solution is regulated so that the thickness of the undercoating agent layer after volatilization of an inorganic solvent becomes 0.002-0.2mm. Corrosion prevention properties possessed by epoxy resin is displayed sufficiently without the intrusion of corrosive substance into an adhesive interface between the surface of a steel pipe and the undercoating agent as the undercoating agent is dried to the touch in a period of time from scores of minutes to several hours and cured completely after the lapse of several times as long as of the period of time. Then after the adhesive agent layer of the corrosion prevention tape has been cured through heat of a pipe line after working of the same, sufficient adhesiveness is displayed by the undercoating agent layer and adhesive agent layer and sufficient corrosion prevention properties are displayed even at a high temperature.