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A method for improving the comprehensive properties of cobalt-based alloy surface

A cobalt-based alloy with comprehensive performance technology, applied in the direction of anodic oxidation, etc., can solve the problems of high hardness of cobalt-based alloys, rare modification methods, and difficult formation of nano-layers, etc., to achieve improved wear resistance and corrosion resistance, Avoid the effects of reduced toughness, improved strength and wear resistance

Active Publication Date: 2020-06-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: there are few methods for modifying Co-Cr-Mo alloys in the prior art, and the hardness of cobalt-based alloys is relatively high. Common techniques are not easy to form nanometer layers on the surface of alloys. Invented and selected boron carbide ceramic projectiles for nano-processing, combined with the improved electrochemical nitriding method

Method used

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  • A method for improving the comprehensive properties of cobalt-based alloy surface
  • A method for improving the comprehensive properties of cobalt-based alloy surface
  • A method for improving the comprehensive properties of cobalt-based alloy surface

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Embodiment 1

[0027] (1) Use the 9070A dry shot peening machine to carry out nano treatment on the surface of the alloy, and select the boron carbide ceramic projectile with high hardness to carry out the nano treatment on the alloy at a speed of 150m / s. The shot peening particle size is 4mm, and the nozzle is vertically downward The alloy is 100mm, the sample is placed on a horizontal support, and the sample is shot peened at a frequency of 100Hz to obtain a nano-layer with a thickness of 10nm.

[0028] (2) A three-electrode system was used to modify the surface of the nano-treated Co-Cr-Mo alloy by electrochemical constant potential method. The working solution of the three-electrode system is a mixed solution of nitric acid, sodium nitrite and sodium nitrate, HNO 3 、NaNO 2 and NaNO 3 The molar ratio is 1:2:3, the working temperature is 25°C, the reference electrode in the system is a saturated calomel electrode, the auxiliary electrode is a platinum sheet, and the Co-Cr-Mo alloy with g...

Embodiment 2

[0032] (1) Use the 9070A type dry shot peening machine to carry out nano treatment on the surface of the alloy, select high-hardness boron carbide ceramic projectiles to carry out nano treatment on the alloy at a speed of 200m / s, the shot peening particle size is 6mm, and the distance between the nozzle and the alloy is vertically downward 100mm, the sample is placed on a horizontal support, and the sample is shot-peened at a frequency of 100Hz to obtain a nano-layer with a thickness of 20nm.

[0033] (2) Same as implementation case 1.

Embodiment 3

[0035] (1) Same as implementation case 1.

[0036] (2) A three-electrode system was used to modify the surface of the nano-treated Co-Cr-Mo alloy by electrochemical constant potential method. The working solution of the three-electrode system is a mixed solution of nitric acid, sodium nitrite and sodium nitrate, HNO 3 、NaNO 2 and NaNO 3The molar ratio is 1:2:3, the working temperature is 25°C, the reference electrode in the system is a saturated calomel electrode, the auxiliary electrode is a platinum sheet, and the Co-Cr-Mo alloy with good surface activity is treated as the cathode. When working, set the working voltage to -0.9V, control the current between 2 ~ 20mA, and the time is 4h. After the modification treatment, the sample is cleaned with deionized water and dried with nitrogen to obtain high wear resistance and corrosion resistance. Co-Cr-Mo alloys with good plasticity and toughness.

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Abstract

The invention relates to a process technology method for improving comprehensive performance of the surface of Co-Cr-Mo alloy. The process adopts the following technology method that firstly, a dry type shot blasting machine is used for conducting nanometer treatment on the surface of the Co-Cr-Mo alloy, the surface activity of the alloy material is improved, then the treated Co-Cr-Mo alloy with good surface activity serves as an anode and is soaked into a specific nitrogen-containing solution, and surface treatment is conducted on the Co-Cr-Mo alloy with electrochemical technology. Surface nanometer treatment and electrochemical nitriding surface treatment are conducted sequentially, and the overall plasticity and toughness of the Co-Cr-Mo alloy are prevented from being influenced greatlywhile abrasion resistance and corrosion resistance of the Co-Cr-Mo alloy are improved substantially. The process technology method can be conducted without the need for high temperature, relevant equipment is simple and controllable, and compared with a traditional surface nitriding process, the process technology method has the advantages of being low in preparation cost, low in energy consumption, environmentally friendly and capable of achieving good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of alloy material surface treatment, and in particular relates to a process method for improving the comprehensive performance of Co-Cr-Mo alloy surface. Background technique [0002] Cobalt-based alloys are widely used and rich in types of alloys. Because of their good resistance to various types of wear and corrosion, as well as high-temperature oxidation properties, they are widely used in the fields of medical biomaterials and aerospace engine manufacturing. Useful. The Co-Cr-Mo alloy is one of the cobalt-based alloys, which has better corrosion resistance, wear resistance and excellent casting performance than stainless steel, and is easy to form and process, and can be used as casting products and hot forging precision processing Products, among which cast Co-Cr-Mo alloys have been used in the field of metal dentistry for decades, while hot forged Co-Cr-Mo alloys are used for hips, shoulders, elbows, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/34C22C19/07
CPCC22C19/07C25D11/34
Inventor 潘太军江健郭莉莉刘苏李远士
Owner CHANGZHOU UNIV