公开(公告)号：US10156008B2

公开(公告)日：2018-12-18

申请号：US15510343

申请日：2015-10-05

Applicant: AIR WATER NV INC.

Inventor： Hisao Fujikawa ,  Atsushi Miyamoto ,  Morihiro Fujita

IPC: C22F1/10 ,  C23C8/26 ,  C23C12/00 ,  C21D1/06 ,  C23C8/24 ,  C23C8/02 ,  C23C8/08 ,  C23C8/80 ,  C23C10/02 ,  C23C10/28 ,  C23C10/30 ,  C23C10/32 ,  C23C10/34 ,  C23C10/36 ,  C23C12/02 ,  C23C28/00 ,  C22F1/00

Abstract: Provide a metal surface reforming method enabling metallic products with superior characteristics such as surface hardness, heat resistance, corrosion resistance, high temperature oxidation, high temperature corrosion, and environmental corrosion and the like.Halogenation treatment of heating and retaining a base material in an atmosphere containing a halogen based gas is performed on a base material of iron based metal or nickel based metal, then nitride processing of heating and retaining the halogenated base material described above in an atmosphere containing a nitrogen source gas is performed, then chromizing treatment is performed by placing the nitrided base material in a powder containing metal chromium powder to form a surface reformed layer on the base material described above. These metallic products obtained have high hardness, superior heat resistance and corrosion resistance, and exhibit superior performance in high temperature oxidation, high temperature corrosion, erosion, and cavitation and the like environments. Further, the metallic products described above exhibit superior performance in acid or alkali environments, neutral environments, and corrosive environments such as chlorides like salt water.