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High-temperature-resistant composite coating and preparation method thereof

A composite coating, high temperature resistant technology, applied in the field of composite electrodeposition, to achieve the effect of enhancing the performance of composite coating, reducing internal defects and compact structure

Inactive Publication Date: 2017-01-04
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultrasound has the effect of dispersing and agglomerating particles, which can improve the dispersion of particles and the uniformity of distribution in the coating, but at the same time it will also affect the residence of particles on the cathode surface, so it is necessary to select and control the parameters of ultrasonic waves

Method used

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  • High-temperature-resistant composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the surface of 45 steel workpiece is pretreated, the surface is coated with Co-Cr by jet electrodeposition method. 3 C 2 Composite coating. Its plating method is:

[0024] 1) Configure the composite plating solution, which consists of: CoSO 4 ·7H 2 O 430g / L, NaCl 25g / L, H 3 BO 3 35g / L, CTAB0.2g / L, pH=3. The operating process is: current density 37A / dm 2 , the temperature is 40°C, the flow rate of the plating solution is 2.2L / min, and the relative moving speed of the anode and cathode is 3.0mm / s;

[0025] 2) Conduct electro-cleaning and activation treatment on the surface of 45 steel workpieces, and use nickel primer as the transition layer;

[0026] 3) The deposition time is 30 minutes.

[0027] The obtained coating is a pure cobalt coating, the hardness of the coating is 374HV, the friction coefficient of the coating is 0.786, and the wear volume is 5.888×10 -3 mm 3 .

Embodiment 2

[0029] 1) Configure the composite plating solution, which consists of: CoSO 4 ·7H 2 O 430g / L, NaCl 20g / L, H 3 BO 3 35g / L, CTAB0.1g / L, nickel-containing (nickel mass content is nickel-containing Cr 3 C 2 30%-35% of the particles, the following examples are the same) Cr 3 C 2 Granules 350g / L, pH=4. The operating process is: current density 35A / dm 2 , the temperature is 40°C, the flow rate of the plating solution is 2.2L / min, and the relative moving speed of the anode and cathode is 3mm / s;

[0030] 2) Conduct electro-cleaning and activation treatment on the surface of 45 steel workpieces, and use nickel primer as the transition layer;

[0031] 3) The deposition time is 30 minutes.

[0032] The resulting composite coating, Cr 3 C 2 The mass fraction of particles is 9.2%, the hardness of the coating is 485.4HV, the friction coefficient of the coating is 0.538, and the wear volume is 2.052×10 -3 mm 3 .

Embodiment 3

[0034] 4) Configure the composite plating solution, which consists of: CoSO 4 ·7H 2 O 450g / L, NaCl 20g / L, H 3 BO 3 30g / L, CTAB0.3g / L, nickel-containing Cr 3 C 2 Granules 500g / L, pH=3. The operating process is: current density 40A / dm 2 , the temperature is 40°C, the flow rate of the plating solution is 2.3L / min, and the relative moving speed of the anode and cathode is 3mm / s;

[0035] 5) Conduct electro-cleaning and activation treatment on the surface of 45 steel workpieces, and use nickel primer as the transition layer;

[0036] 6) The deposition time is 30 minutes.

[0037] The resulting composite coating, Cr 3 C 2 The mass fraction of particles is 15.4%, the hardness of the coating is 552HV, the friction coefficient of the coating is 0.445, and the wear volume is 1.453×10 -3 mm 3 .

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Abstract

The invention discloses a preparation method of a high-temperature-resistant composite coating. The composite coating employs cobalt as a base metal and nickel-covered chromium carbide particles as a disperse phase, and the chromium carbide particles of high content and uniform dispersion maintain high hardness of the composite coating at normal temperature and high temperature; composite coating liquid is dispersed by means of mechanical stirring and ultrasonic stirring to form uniform and stable composite coating liquid; electrodeposited base is a metal material, the surface of the base is pretreated, the metal Co and hard particles Cr3C2 are co-deposited into the composite coating by comprehensively controlling the process parameters such as electrodepositing temperature, current density, coating liquid flow and relative motion speed of cathode and anode. The problems that it is difficult to composite micro hard particles with high content in the composite electrodepositing process, the hard particles are unevenly distributed in the coating and the hard particles are in poor combination with the base metal Co are solved, and the prepared Co-Cr3C2 composite coating has high red hardness and excellent wear resistance.

Description

technical field [0001] The invention relates to the technical field of composite electrodeposition. Background technique [0002] With the development of industry and the continuous improvement of material performance requirements, the method of using surface coating technology to strengthen and protect the material surface has been widely used in industry. As a surface coating technology, electroplating technology has the advantages of operation The advantages of simplicity, low cost, less pollution and rapid molding have been widely used in industrial production. However, traditional single-metal coatings and alloy coatings have been difficult to meet modern requirements for high-temperature protection of material surfaces. Composite coatings formed by co-deposition of matrix metals and insoluble hard particles, fibers, etc. have more excellent properties and have wider application prospects. [0003] In the application process of materials, more and more working conditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D15/00
CPCC25D15/00
Inventor 谭俊王猛张庆郑晓辉宋皓孟令东臧艳刘晓亭吴迪
Owner ACADEMY OF ARMORED FORCES ENG PLA
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