Method for surface treatment of corrosion-resistant nickel-based alloy and its structure

Abstract

A method for the surface treatment of a corrosion-resistant nickel-based alloy and the resulting surface structure of the treated alloy is disclosed. The method includes immersing a nickel-based alloy in a first neutral or alkaline solution to remove surface contaminants, followed by immersing the cleaned alloy in a second neutral or alkaline solution to form functional groups on its surface. Subsequently, a low-temperature heat treatment is performed to form a passivation layer on the surface of the nickel-based alloy. The passivation layer has a surface roughness of less than 0.04 microns and a thickness ranging from 5 nanometers to 200 nanometers. The resulting corrosion-resistant nickel-based alloy comprises a substrate made of the nickel-based alloy and a passivation layer established on at least one surface of the substrate. The nickel content of the alloy is greater than 50%, and the alloy may also contain additional metallic components such as chromium (Cr) and manganese (Mn). The passivation layer may be a layer of nickel oxide, manganese oxide, chromium oxide, or a combination thereof.

Dependencies are inferred from the claim text.