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A preparation method of an oxide diffusion barrier and a corrosion-resistant layer on the surface of Cr-containing stainless steel

A surface oxide and stainless steel technology, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of diffusion barrier cracking under force, affecting diffusion resistance, cracking, etc., and achieve the effect of simple preparation method and continuous dense bonding performance

Active Publication Date: 2017-08-25
XI AN JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the preparation of the diffusion barrier by the above-mentioned traditional coating technology will have a certain impact on the preparation of the corrosion-resistant Ni layer. For example, the non-conductivity of the oxide diffusion barrier will have an adverse effect on the preparation of the Ni layer by the electroplating process, while the spray coating The Ni layer prepared by the process is easy to cause the diffusion barrier to be broken by force, which further affects its anti-diffusion effect.
In addition, the oxide and Ni layers prepared successively by coating technology are physically bonded, and cracks are easily caused by differences in thermophysical properties during service.

Method used

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  • A preparation method of an oxide diffusion barrier and a corrosion-resistant layer on the surface of Cr-containing stainless steel
  • A preparation method of an oxide diffusion barrier and a corrosion-resistant layer on the surface of Cr-containing stainless steel
  • A preparation method of an oxide diffusion barrier and a corrosion-resistant layer on the surface of Cr-containing stainless steel

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preparation example Construction

[0034] The preparation method of the Cr-containing stainless steel surface oxide diffusion barrier and the corrosion-resistant layer of the present invention comprises the following steps:

[0035] 1) Take Ni(O) solid solution powder, and then sieve Ni(O) solid solution powder with a particle size less than 50 μm as cold spray powder;

[0036] 2) Degreasing and cleaning the Cr-containing stainless steel substrate to be treated, followed by sandblasting;

[0037] 3) spraying the cold spray powder obtained in step 1) onto the surface of the Cr-containing stainless steel substrate treated by step 2) by using cold spray technology, and depositing a Ni(O) solid solution layer on the surface of the Cr stainless steel substrate;

[0038] 4) depositing a corrosion-resistant Ni layer on the surface of the Ni(O) solid solution layer obtained in step 3);

[0039] 5) Place the Cr stainless steel substrate deposited with the corrosion-resistant Ni layer obtained in step 4) in a container ...

Embodiment 1

[0047] Using 310 stainless steel with a Cr content of about 25wt.% as the base material (see Table 1 for the composition), the material is pretreated: ultrasonic degreasing with acetone, cleaning with absolute ethanol and drying;

[0048] Table 1

[0049]

[0050]The preparation of Ni(O) solid solution powder adopts the method of mechanical alloying. The spherical Ni powder with a particle size of 63-75 μm is placed in a stainless steel ball mill tank. The ball-to-material ratio is 10:1, and the stainless steel ball is large (12mm) , The ratio of the number of small (6mm) balls is about 1:10:3, the speed is 150r / min, and the particle size of the powder after mechanical alloying for 8 hours is about 30μm. It is measured by an oxygen meter (RO-316, LECO). When the processing time When being 8h, the oxygen content of Ni(O) powder is 3.2wt.%, refer to Fig. 1 (a) and Fig. 1 (b);

[0051] The 310SS substrate is sandblasted before depositing the corrosion-resistant Ni layer to re...

Embodiment 2

[0058] Using 316 stainless steel with a Cr content of about 18.wt% as the base material (see Table 4 for the composition), the material was pretreated: ultrasonic degreasing with acetone, cleaning with absolute ethanol and drying.

[0059] Table 4

[0060]

[0061] The preparation of Ni(O) solid solution powder adopts the method of mechanical alloying. The spherical Ni powder with a particle size of 63-75 μm is placed in a stainless steel ball mill tank. , The ratio of the number of small (6mm) balls is about 1:10:3, the rotation speed is 120r / min, and Ni(O) solid solution powder is obtained after mechanical alloying for 15h. The oxygen content of Ni(O) powder is 4.1wt.%.

[0062] The 316SS substrate is sandblasted before depositing the corrosion-resistant Ni layer to remove surface pollutants and improve the bonding strength of the coating. The cold spraying process parameters are listed in Table 2. The inner layer is sprayed with ball-milled Ni(O) powder, and the outer l...

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Abstract

The invention discloses a preparation method of a surface oxide diffusion barrier and an anti-corrosion layer of a Cr-contained stainless steel. The preparation method of the surface oxide diffusion barrier and the anti-corrosion layer of the Cr-contained stainless steel comprises the steps as follows: 1) extracting a Ni(O) solid solution powder, then sieving the Ni(O) solid solution powder whose particle size is less than 50Mum as a cold spraying powder; 2) implementing a sand blast process to a to-be-processed Cr-contained stainless steel matrix after removing oil and rinsing; 3) using a cold spraying technology to spray the cold spraying powder obtained in the step 1) onto a surface of the Cr-contained stainless steel matrix that is processed by the step 2), and depositing a Ni(O) solid solution layer on the surface of the Cr-contained stainless steel; 4) depositing an anti-corrosion Ni layer on a surface of the Ni(O) solid solution layer that is obtained in the step 3); and 5) putting the Cr-contained stainless steel matrix into a container that is protected by an inert gas, then implementing a thermal treatment, thereby growing a Cr2O3 diffusion barrier on the surface of the Cr-contained stainless steel matrix; then preserving the heat, thereby obtaining the surface oxide diffusion battier and the anti-corrosion layer of the Cr-contained stainless steel. A continuous and compact anti-corrosion Ni layer that has an excellent bonding property with the Cr-contained stainless steel matrix can be prepared by the preparation method of the surface oxide diffusion barrier and the anti-corrosion layer of the Cr-contained stainless steel.

Description

technical field [0001] The invention belongs to the technical field of surface alloying and coating, and relates to a method for preparing an oxide diffusion barrier and a corrosion-resistant layer on the surface of Cr-containing stainless steel. Background technique [0002] Molten Salt Reactor (Molten Salt Reactor-MSR) is a fourth-generation nuclear reactor, because of its extremely high neutron economy, high power density, inherent load controllable, large negative temperature coefficient, high conversion ratio, high reliability, fuel combination The advantages of low cost and proliferative properties have attracted widespread attention at home and abroad. However, the molten fluoride used in fuel and coolant in MSR is extremely corrosive, and most protective oxide films such as Al 2 o 3 、Cr 2 o 3 and SiO 2 Active dissolution will occur, which will lead to the failure of the material of the hot end parts (mainly stainless steel). Ni has high chemical stability in mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/02
Inventor 徐雅欣李长久雒晓涛李成新杨冠军
Owner XI AN JIAOTONG UNIV
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