Method for preparing boride coating on stainless steel surface

A stainless steel and coating technology, which is applied in the field of stainless steel surface modification treatment, can solve the problems of high brittleness, easy peeling, easy formation of micro cracks or deformation of the coating, and achieve the effect of improving electrical conductivity, improving compactness and reducing cracks

Active Publication Date: 2016-08-03
上海韵申新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the traditional surface treatment technologies such as laser cladding, plasma spraying, etc. have a great impact on the preparation of titanium diboride (TiB 2 ) The compactness of the coating is unfavorable, and it is easy to form microcracks or deformation; titanium diboride (TiB 2 ) The coating has high brittleness, is not firmly combined with the substrate, is easy to peel off, and is not easy to deposit on the metal surface;

Method used

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  • Method for preparing boride coating on stainless steel surface
  • Method for preparing boride coating on stainless steel surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Surface pretreatment of stainless steel substrate

[0024] Cut the 304L stainless steel into samples of length × width × height 10mm × 10mm × 5mm, and use 400, 2000 # Grind with SiC sandpaper step by step to remove the surface oxide layer, then put it in acetone solution to degrease and clean for 3 minutes, wash with deionized water and dry;

[0025] (2)TiB 2 Preparation of deposited electrodes

[0026] Pure TiB 2 The powder is loaded into a steel mold, held at a pressure of 7 MPa for 4 minutes for compression molding, and then the compressed TiB 2 Under the protection of argon, it firstly rises from room temperature (25°C) to 450°C in 1.5 hours, then rises to 1600°C in 2 hours, then rises from 1600°C to 1900°C in 1.5 hours, and keeps it at 1900°C for 4 hours. Cool to room temperature;

[0027] (3) Connect the 304L stainless steel after surface treatment in step (1) to the cathode of high-energy micro-arc alloying equipment, and the TiB prepared in step (2) 2 ...

Embodiment 2

[0030] (1) Surface pretreatment of stainless steel substrate

[0031] Concrete operation is with embodiment 1;

[0032] (2)TiB 2 / C deposition electrode preparation

[0033] TiB 2 , After the toner is sieved through an 80-mesh filter, the TiB 2 The powder and carbon powder are doped and mixed uniformly, among which TiB 2 Powder is 98.0wt.%, carbon powder is 2.0wt.%,

[0034] Compression molding after ball milling again, ball milling adopts planetary ball mill, grinding medium is zirconia ball, wherein the ratio of large ball, medium ball and small ball is 1:2:4, adjust the rotating speed of ball mill to be 200r / min, and the ball milling time is 2h; TiB after ball milling 2 / C powder is loaded into a steel mold, held at a pressure of 7MPa for 4 minutes and pressed into shape;

[0035] Then the pressed TiB 2 / C Under the protection of argon, first rise from room temperature (25°C) to 450°C in 1.5 hours, then rise to 1600°C in 2 hours, then rise from 1600°C to 1900°C in 1...

Embodiment 3

[0040] (1) Surface pretreatment of stainless steel substrate

[0041] Concrete operation is with embodiment 1,

[0042] At this time, the stainless steel substrate is at 0.3MH 2 SO 4 Corrosion polarization curve in +2ppmF solution is attached figure 1 shown in;

[0043] (2)TiB 2 / C deposition electrode preparation

[0044] TiB 2 , After the toner is sieved through an 80-mesh filter, the TiB 2 The powder and carbon powder are doped and mixed uniformly, among which TiB 2 The powder is 96.0wt.%, the carbon powder is 4.0wt.%, and the ball milling, pressing molding, and sintering processes are the same as in Example 2;

[0045] (3) High-energy micro-arc alloying deposition

[0046] Concrete operation is with embodiment 2,

[0047] A layer of 18 μm thick and uniform and dense TiB was obtained after deposition for 4 minutes 2 / C coating, the coating surface has no obvious defects (if attached figure 2 shown in b), and provide good protection for the matrix under acidic c...

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Abstract

The invention belongs to the technical field of modified treatment of stainless steel surfaces and particularly relates to a preparation process of a TiB2 / C anti-corrosion coating. A stainless steel substrate is taken as the cathode of high-energy micro-arc alloying equipment, a depositing electrode is taken as the anode of the high-energy micro-arc alloying equipment, high-energy micro-arc alloying deposition is performed under the protection of argon, and a coating is obtained on the substrate surface. The TiB2 / C coating prepared after doping TiB2 powder with carbon powder is improved in compactness; and the high-energy micro-arc alloying process promotes metallurgical bonding of the coating and the substrate, so that the fragility is reduced, no obvious defect exists on the surface, and under such severe conditions as high temperature and acidity, the substrate can be effectively protected for a long term.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface modification treatment, in particular to a TiB 2 / C Corrosion-resistant coating preparation process. Background technique [0002] Titanium diboride (TiB 2 ), as a transition metal-based ceramic, has excellent thermal stability, oxidation resistance, hardness, wear resistance and electrical conductivity. Materials, cutting tools and other fields are titanium diboride (TiB 2 ) Typical application industries. Given that titanium diboride (TiB 2 ) has the characteristics of high hardness and good wear resistance. Many researchers use it as a coating material to improve the surface hardness of the metal substrate and improve its wear resistance. They use thermal spraying, laser cladding, pulse electrode deposition, etc. Technical method to obtain TiB on metal surface 2 The base coating material improves the surface hardness, wear strength, oxidation resistance and electrical cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/10C25D17/10
CPCC25D9/10C25D17/10
Inventor 潘太军沈杰陈杨左小伟陈婧
Owner 上海韵申新能源科技有限公司
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