SURFACE-TREATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND METHOD FOR PRODUCING THE SAME

• Main Authors: SUGAE KIYONOBU, KAMIMURA TAKAYUKI, YUKI HIDEAKI, KAJIMA KAZUYUKI
• Format: Patent
• Language: English
• Published: 29.08.2013
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PROBLEM TO BE SOLVED: To provide a surface-treated steel material which exhibits excellent corrosion resistance even in a concentrated chloride environment where the concentration of chloride ions is high, can extremely suppress the peeling of a coating even in an environment of the cooling/heating cycle, caused by solar irradiation and atmospheric temperature, and shows superior long-term durability, and to provide a method for producing the surface-treated steel material.SOLUTION: A surface-treated steel material is characterized in that a surface of a steel material is covered with a rust layer or an organic resin layer containing α-FeOOH together with Sn and/or Ce. An organic resin having a dry film thickness of ≥20 μm may be applied as a topcoat layer.