Disclosed is a surface anti-corrosion treatment method for stainless steel. The method comprises the following steps: (1) performing chemical de-oiling and alkaline corrosion treatments on the surface of stainless steel by using a sodium hydroxide solution and a solution containing an alkaline corrosion active agent, and then washing with water; (2) performing, by using an oxidation solution, an oxidation treatment on the surface of the stainless steel treated in step (1), and then washing with water; (3) using the surface of the stainless steel treated in step (2) as a cathode and soaking same in an electrolyte for electrolysis, and then washing with water; and (4) placing the surface of the stainless steel treated in step (3) at a temperature of 50° C.-60° C. under a humidity of 60%-70%, and performing a hardening treatment. Also disclosed are the use of the treatment method in the treatment of a stainless steel part and a stainless steel part obtained after the treatment by means of the treatment method.

A nanocrystalline material based on a stainless steel surface. In percentage by weight, the nanocrystalline material comprises: 0 to 3% of carbon, 20% to 35% of oxygen, 40% to 53% of chromium, 10% to 35% of ferrum, 0 to 4% of molybdenum, 1% to 4% of nickel, 0 to 2.5% of silicon, 0 to 2% of calcium, and the balance of impurity elements. Also disclosed is a preparation method for the nanocrystalline material, and the nanocrystalline material that is based on a stainless steel surface and that is prepared by using the preparation method.

A nanocrystalline material based on a stainless steel surface. In percentage by weight, the nanocrystalline material comprises: 0 to 3% of carbon, 20% to 35% of oxygen, 40% to 53% of chromium, 10% to 35% of ferrum, 0 to 4% of molybdenum, 1% to 4% of nickel, 0 to 2.5% of silicon, 0 to 2% of calcium, and the balance of impurity elements. Also disclosed is a preparation method for the nanocrystalline material, and the nanocrystalline material that is based on a stainless steel surface and that is prepared by using the preparation method.

Disclosed is a surface anti-corrosion treatment method for stainless steel. The method comprises the following steps: (1) performing chemical de-oiling and alkaline corrosion treatments on the surface of stainless steel by using a sodium hydroxide solution and a solution containing an alkaline corrosion active agent, and then washing with water; (2) performing, by using an oxidation solution, an oxidation treatment on the surface of the stainless steel treated in step (1), and then washing with water; (3) using the surface of the stainless steel treated in step (2) as a cathode and soaking same in an electrolyte for electrolysis, and then washing with water; and (4) placing the surface of the stainless steel treated in step (3) at a temperature of 50 C.-60 C. under a humidity of 60%-70%, and performing a hardening treatment. Also disclosed are the use of the treatment method in the treatment of a stainless steel part and a stainless steel part obtained after the treatment by means of the treatment method.

Provided is a grain oriented electrical steel sheet including a base metal steel sheet, an intermediate layer and an insulation coating, wherein: the intermediate layer is an oxide film; an average thickness of the oxide film is 2-500 nm; the insulation coating is a phosphate coating; an average thickness of the insulation coating is 0.1-10 ?m. When grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-K? excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2?=24.8?; a half value width FWHM.sub.0.5 of the diffraction peak under a diffraction condition with an X-ray incident angle ?=0.5? and a half value width FWHM.sub.1.0 of the diffraction peak under a diffraction condition with an X-ray incident angle ?=1.0? satisfy 0.20??FWHM.sub.0.5?2.00?, 0.20??FWHM.sub.1.0?2.00?, and 0??|F.WHM.sub.0.5?FWHM.sub.1.0|?1.00?.

Provided is a grain oriented electrical steel sheet including a base metal steel sheet, an intermediate layer and an insulation coating, wherein: the intermediate layer is an oxide film; an average thickness of the oxide film is 2-500 nm; the insulation coating is a phosphate coating; an average thickness of the insulation coating is 0.1-10 m. When grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-K excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2=24.8; a half value width FWHM.sub.0.5 of the diffraction peak under a diffraction condition with an X-ray incident angle =0.5 and a half value width FWHM.sub.1.0 of the diffraction peak under a diffraction condition with an X-ray incident angle =1.0 satisfy 0.20FWHM.sub.0.52.00, 0.20FWHM.sub.1.02.00, and 0|FWHM.sub.0.5FWHM.sub.1.0|1.00.