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A preparation method for a composite coating for protection of Cr-containing stainless steel in molten fluoride salt

A composite coating, stainless steel technology, applied in coatings, electrolytic coatings, etc., can solve the problems of poor bonding force, can not completely block the mutual diffusion of elements, etc., and achieves the reduction of electroplating time, the uniform and dense deposition layer, and the reduction of coating porosity. Effect

Active Publication Date: 2021-02-09
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers have used the in-situ growth method to prepare an oxide diffusion barrier between the cold sprayed coating and the substrate, but found that the bonding force between the coating and the substrate under the cold spraying process is poor, resulting in the diffusion barrier of the subsequent preparation. Microscopic defects cannot be avoided, and the interdiffusion of elements cannot be completely blocked during the long-term service of the coating

Method used

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  • A preparation method for a composite coating for protection of Cr-containing stainless steel in molten fluoride salt
  • A preparation method for a composite coating for protection of Cr-containing stainless steel in molten fluoride salt
  • A preparation method for a composite coating for protection of Cr-containing stainless steel in molten fluoride salt

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Embodiment 1

[0045] With stainless steel containing about 16wt.% Cr (see Table 1 for composition) as the cathode base material, the stainless steel cathode base material was cut into 15×10×2 mm thin slices, and the nickel sheet was used as the anode base material. The size of the nickel sheet was the same as that of the stainless steel The size of the cathode substrate is equivalent, and the cathode and anode substrates are pretreated, that is, after grinding and chamfering, ultrasonic degreasing with acetone, cleaning with deionized water, acidification, and finally rinsing. Then put it into the plating solution containing NiO nanoparticles (50nm) that has been dispersed (this plating solution contains the following components in every 1L: nickel sulfate hydrate 250g, nickel chloride hydrate 40g, boric acid 40g, lauryl sulfuric acid Sodium 0.3g, nickel oxide powder 20g, and the rest are deionized water) for electroplating. The power supply is an adjustable double pulse power supply, the p...

Embodiment 2

[0051] With stainless steel containing about 16wt.% Cr (see Table 1 for composition) as the cathode substrate, the stainless steel cathode substrate is cut into 15×10×2mm thin slices, and the nickel sheet is used as the anode substrate, and the size of the nickel sheet is the same as that of the stainless steel The size of the cathode substrate is equivalent, and the cathode and anode substrates are pretreated, that is, after grinding and chamfering, acetone ultrasonic degreasing, deionized water cleaning, acidification, and finally rinsing. Then put it into the plating solution containing NiO nanoparticles (50nm) that has been dispersed (this plating solution contains the following components in every 1L: nickel sulfate hydrate 250g, nickel chloride hydrate 40g, boric acid 40g, lauryl sulfuric acid Sodium 0.3g, nickel oxide powder 100g, and the rest are deionized water) for electroplating. The power supply is an adjustable double pulse power supply, the pulse frequency used i...

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Abstract

The invention discloses a preparation method of a composite coating for Cr-containing stainless steel protection in fused fluoride salt. The method comprises the following steps that (1) stainless steel is selected as a cathode base material, and a nickel sheet is selected as an anode base material; (2) the cathode base material and the anode base material are placed in a nano composite plating tank, nano composite pulse plating is carried out during stirring, and a Ni(NiO) transition layer is prepared; (3) the base materials are subjected to stirring and nickel plating in a bright nickel plating tank; and (4) the base materials are put in a container full of inert gas shielding to be subjected to heat treatment, the temperature of heat treatment ranges from 850 DEG C to 900 DEG C, the time of heat treatment is 8 h, Cr in the bas materials reacts with NiO in the transition layer, and then a Cr2O3 diffusion barrier is grown out on the surface in situ. According to the method, operationis simple and convenient; controllability of the plating layer is high; the anticorrosion effect is good; the electroplating time is reduced; few additives of plating liquid are needed; cost is reduced, and meanwhile pollution to the environment is reduced; and the compactness and binding force of the prepared coating are good.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, in particular to a method for preparing a composite coating for protecting Cr-containing stainless steel in molten fluoride salt. Background technique [0002] Molten fluoride salt is a new type of heat transfer and storage medium with high temperature and high heat flux density. Its thermal physical and thermochemical properties are widely used in high temperature industrial fields. However, molten fluoride is very corrosive at high temperatures. When using corresponding equipment or systems, metal-based structural materials are prone to active dissolution of metal elements in high-temperature molten fluoride, which significantly reduces the service life of materials, which is also one of the main obstacles restricting the industrial application of molten fluoride salts. . In recent years, with the development of technologies such as molten salt stacks, spent fuel rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/18C25D3/12C25D5/50C25D5/36C25D15/00
Inventor 王艳丽王萍张盛华李伟华卢朝霞王立升
Owner GUANGXI UNIV
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