| 摘要 |
<p>Provided is a steel material with a rust layer, said steel material being highly resistant to corrosion even in a paintless state and even in a severe corrosive environment where a large amount of air-borne salt is present, particularly, in a seaboard region. Specifically, this steel material with a rust layer can be obtained by forming a rust layer on the surface of a base steel material. The rust layer contains Nb and Sn, and the number of Nb atoms in the rust layer in terms of the maximum is 0.01 or more relative to 100 Fe atoms, while the number of Sn atoms therein in terms of the maximum is 0.005 or more relative to 100 Fe atoms.</p> |
