Ion nitriding method for improving wear resistance and corrosion resistance of martensitic stainless steel
A martensitic stainless steel, ion nitriding technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve problems such as wear and corrosion
Inactive Publication Date: 2021-09-14
SHANGHAI JIAO TONG UNIV
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[0008] The purpose of the present invention is to solve the problem of wear and corrosion of nuclear grade martensitic precipitation hardening stainless steel in the process of use, using ion nitriding treatment, to provide a kind of ion nitriding method to improve the wear resistance and corrosion resistance of martensitic stainless steel, improve Wear and corrosion resistance of nuclear grade martensitic precipitation hardening stainless steel
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Embodiment 1
[0032] The invention provides an ion nitriding process method for improving the wear resistance and corrosion resistance of nuclear grade martensitic precipitation hardening stainless steel, comprising the following steps:
[0033] A1. Surface pretreatment:
[0034] a. In deionized water and alcohol solution, ultrasonically clean the circular flaky nuclear grade martensitic precipitation hardening stainless steel 17-4PH with a diameter of 150 mm and a thickness of 2 mm to remove impurities and oil stains on the surface;
[0035] b. Mechanically grind the surface of the circular flaky nuclei-grade martensitic precipitation hardening stainless steel 17-4PH with SiC water abrasive paper with a mesh number of 180, 400, 800, 1000, 1200, and 2000, and the roughness Ra of the final grinding is About 0.5 microns;
[0036] c. Before changing the water sandpaper of different meshes in step b, ultrasonically clean the circular sheet-shaped nuclei-grade martensitic precipitation hardenin...
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Abstract
The invention belongs to the technical field of metal surface treatment, and particularly relates to an ion nitriding method for improving wear resistance and corrosion resistance of martensitic stainless steel. The method comprises the following steps that firstly, the surface of the stainless steel is pretreated, ultrasonic cleaning and mechanical polishing are conducted on nuclear-grade martensitic precipitation hardening stainless steel, then nitriding treatment is conducted on the nuclear-grade martensitic precipitation hardening stainless steel, and the temperature of ion nitriding ranges from 410 DEG C to 430 DEG C; the ratio of N2 to H2 is 1: 3; the voltage is 700V; and the nitriding time is set to be 1-10 hours. Through the steps, a nitriding layer with a certain depth is obtained on the surface of the nuclear-grade martensitic precipitation-hardening stainless steel, so that the problems of abrasion and corrosion of the nuclear-grade martensitic precipitation-hardening stainless steel in the service process (in a high-temperature and high-pressure water environment) are solved; and the wear resistance and the corrosion resistance of the nuclear-grade martensitic precipitation-hardening stainless steel in service (in a high-temperature and high-pressure water environment) are improved.
Description
technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an ion nitriding method for improving the wear resistance and corrosion resistance of martensitic stainless steel. Background technique [0002] The rotation performance and life of the bearing of the reactor control rod driving mechanism directly affect the operation of the driving mechanism, and it is a key part of the driving mechanism. The bearings of the control rod drive mechanism are distributed in the reactor sealing shell, which not only bears the frictional load, but also is exposed to the water of the primary circuit and withstands the corrosion of high-temperature water. Therefore, bearings with excellent wear resistance and corrosion resistance are obtained. Material is one of the keys to ensure the safe and stable operation of the reactor. [0003] At present, the martensitic precipitation hardening stainless steel material (17-4PH) used...
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IPC IPC(8): C23C8/38C23C8/02
CPCC23C8/38C23C8/02
Inventor 郭相龙赖平韩忠立张乐福
Owner SHANGHAI JIAO TONG UNIV