Corrosion-resistant coating on surface of cupronickel alloy and preparation method of corrosion-resistant coating

A corrosion-resistant coating and copper alloy technology, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of corrosion resistance of white copper alloy, etc., to improve corrosion resistance, good bonding, low cost effect

Pending Publication Date: 2022-04-08
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a surface corrosion-resistant coating on a cupronickel alloy and a preparation method thereof. , the combination of the coating and the cupronickel alloy and the technical problem of the effect of the infiltration layer on the corrosion resistance of the cupronickel alloy

Method used

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  • Corrosion-resistant coating on surface of cupronickel alloy and preparation method of corrosion-resistant coating
  • Corrosion-resistant coating on surface of cupronickel alloy and preparation method of corrosion-resistant coating
  • Corrosion-resistant coating on surface of cupronickel alloy and preparation method of corrosion-resistant coating

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Embodiment 1

[0024] 1) The steps of grinding and mechanically polishing the surface of the cupronickel alloy

[0025] The surface of the cupronickel alloy is polished step by step with sandpaper, then ultrasonically cleaned in absolute ethanol, and dried in an oven to obtain the polished surface of the cupronickel alloy.

[0026] 2) Preparation steps of aluminizing agent

[0027] Take copper-aluminum alloy powder, aluminum powder, aluminum oxide powder and ammonium chloride particle according to mass percentage, described copper-aluminum alloy powder (copper content 60%), copper-aluminum alloy powder content 70%, described copper-aluminum alloy powder granularity 40 μm, the aluminum powder content is 5%, the aluminum powder particle size is 60 μm, the ammonium chloride particle content is 1.6%, the balance is alumina powder, the alumina particle size is 10 μm, and the mixed powder is fully mechanically mixed to obtain an aluminizing agent .

[0028] 3) Preparation steps of high temperatu...

Embodiment 2

[0036] 1) The steps of grinding and mechanically polishing the surface of the cupronickel alloy

[0037] The surface of the cupronickel alloy is polished step by step with sandpaper, then ultrasonically cleaned in absolute ethanol, and dried in an oven to obtain the polished surface of the cupronickel alloy;

[0038] 2) Preparation steps of aluminizing agent

[0039] Take copper-aluminum alloy powder, aluminum powder, aluminum oxide powder and ammonium chloride particle according to mass percentage, described copper-aluminum alloy powder (copper content 60%), copper-aluminum alloy powder content 60%, described copper-aluminum alloy powder granularity 40 μm, the aluminum powder content is 4.5%, the aluminum powder particle size is 60 μm, the ammonium chloride particle content is 1.6%, the balance is alumina powder, the alumina particle size is 10 μm, and the mixed powder is fully mechanically mixed to obtain an aluminizing agent ;

[0040] 3) Preparation steps of high tempera...

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Abstract

The invention relates to a cupronickel alloy surface corrosion-resistant coating and a preparation method thereof, the coating is prepared by combining a powder coating method with a high-temperature diffusion heat treatment process, the coating is heated to an aluminized layer growth temperature through heat treatment, nitrogen is accompanied in the heating process, after growth is finished, when the temperature is reduced to a certain temperature, the nitrogen is closed, and furnace cooling is carried out; the process enables the aluminum source to form a diffusion aluminizing layer with a certain thickness and high binding force on the surface of the cupronickel alloy under the thrust of thermodynamic power, and the process comprises the process of diffusing aluminum atoms to a cupronickel matrix and the process of diffusing nickel atoms from the interior of the cupronickel to the aluminizing layer. The coating forms a diffusion aluminizing layer with the thickness of 120-200 [mu] m along with the change of the aluminum content from inside to outside, and the obtained cupronickel surface corrosion-resistant coating can improve the corrosion resistance of the cupronickel alloy on the basis of ensuring the interface bonding force.

Description

technical field [0001] The invention belongs to the field of copper alloy surface modification, and relates to a high-temperature heat treatment process to form a corrosion-resistant coating and a preparation method thereof. [0002] technical background [0003] With the further exploration of marine resources and the demand for economic development, the demand for corrosion-resistant materials is also increasing. At present, copper-nickel alloys are the current marine pipeline materials due to their high thermal conductivity and good mechanical operability. One of the main sources of the industry, including condenser and heat exchange tube materials for coastal power plants and seawater desalination plants, seawater piping materials for offshore drilling platforms and ships. It has good seawater corrosion resistance and antifouling performance, excellent mechanical ductility and antifouling performance. However, due to the harsh environment in the deep sea, the cupronickel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/48C23C10/02
Inventor 陈小红周洪雷刘平高宇航万梓璇张凯李伟马凤仓付少丽邵国森
Owner UNIV OF SHANGHAI FOR SCI & TECH
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