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Lead and bismuth corrosion resistant protection method for T91 and SIMP steel

A corrosion protection, T91 technology, applied in the direction of ion implantation plating, metal material coating process, coating, etc., can solve the problems of oxide film dissolution, corrosion, failure, etc.

Pending Publication Date: 2022-02-25
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0003] In order to improve the corrosion resistance of nuclear reactor structural materials and prolong their service life, in recent years, there have been many methods to slow down the corrosion of structural materials in liquid lead-bismuth solutions, including controlling the concentration of dissolved oxygen in the reaction through oxygen control technology , the principle is to form a stable oxide film on the steel surface, but when the temperature exceeds 500°C, the oxide film will dissolve and corrode and fail ]

Method used

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  • Lead and bismuth corrosion resistant protection method for T91 and SIMP steel
  • Lead and bismuth corrosion resistant protection method for T91 and SIMP steel
  • Lead and bismuth corrosion resistant protection method for T91 and SIMP steel

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Embodiment Construction

[0028] The specific technical solutions of the present invention are described in conjunction with the examples.

[0029] 1. Wire-cut T91 steel and SIMP steel substrates into several pieces of block-shaped small samples with a size of 20mm×10mm×5mm. After pretreatments such as grinding and derusting, dust and decontamination, and sandblasting, they are then placed in electric blast drying box for use

[0030] 2. Deposit a chromium coating on one side of the T91 steel and SIMP steel by magnetron sputtering, the thickness of the chromium coating is 2-3 microns.

[0031] 3. The T91 steel and SIMP steel with chromium coating on the surface were corroded in liquid LBE at 700°C for 50 hours and 140 hours.

[0032] 4. After the corrosion experiment is completed, take out the sample, wash off the residual lead and bismuth on the surface of the sample with glycerin solution at 170°C, then wash the glycerol on the surface of the sample with hot water at 70°C, and finally clean the samp...

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Abstract

The invention belongs to the technical field of metal protection, and particularly relates to a lead and bismuth corrosion resistant protection method for T91 and SIMP steel, which adopts a magnetron sputtering method to deposit chromium coatings on the surfaces of the T91 steel and the SIMP steel, wherein the thickness of the chromium coating is 2-3 microns. The Cr coating prepared by adopting magnetron sputtering has the thickness of 2-3 microns, and in a lead-bismuth solution at the high temperature of 700 DEG C, ferrimand steel still keeps relatively good stability, and compared with a coating-free coating, the coating can effectively relieve the thickness of a corrosion layer.

Description

technical field [0001] The invention belongs to the technical field of metal protection, in particular to a method for protecting T91 and SIMP steel against lead and bismuth corrosion. Background technique [0002] T91 steel and SIMP steel were selected as the main candidates for load and transfer components such as reactor fuel cladding and heat exchangers due to their high yield and tensile strength, good high temperature performance, radiation swelling resistance and thermal conductivity One of the structural materials. However, under the operating conditions of the reactor, LBE with high temperature, high flow rate and high density will corrode the structural materials of the reactor and reduce its service life. Its mechanism is relatively complex, including various physical and chemical processes, such as the dissolution of material component elements, the erosion of materials by flowing LBE, the migration of component elements in solid-liquid two-phase, and the chemic...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/16
CPCC23C14/35C23C14/165
Inventor 李炳生廖庆徐帅戴亚堂
Owner SOUTHWEAT UNIV OF SCI & TECH
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