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Cathodic micro-arc oxidation solution and method for preparing DLC composite oxidation film on steel surface

A technology of composite oxide film and cathode micro-arc, which is applied in anodic oxidation, surface reaction electrolytic coating, electrolytic coating, etc. Density and other issues, to achieve the effect of increased hardness, increased growth rate, and high processing efficiency

Active Publication Date: 2019-03-22
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the micro-arc oxidation process, aluminum, magnesium, titanium, and zirconium samples are usually used as anodes, but steel materials are not valve metals, and it is difficult to form high-quality anodic micro-arc oxidation films
Anodic micro-arc oxidation is difficult to grow a dense oxide film, and the film layer is not dense and has poor bonding force, which limits the improvement of the friction performance of the film layer

Method used

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  • Cathodic micro-arc oxidation solution and method for preparing DLC composite oxidation film on steel surface
  • Cathodic micro-arc oxidation solution and method for preparing DLC composite oxidation film on steel surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this example, the processed steel material is Q235 low carbon steel sample.

[0018] Firstly, the steel material to be treated is pretreated, and the steel surface is pretreated step by step with sandpaper (200#-1200#), rinsed with acetone, rinsed with deionized water and dried.

[0019] Then configure the cathodic micro-arc oxidation solution. The cathodic micro-arc oxidation solution is: methanol 200mL, ethanolamine 200mL, urea 210g, nickel sulfate 15g, nano-carbon powder 20g, sodium chloride 100g, deionized water 450mL.

[0020] After the electrolyte is prepared, immerse the two electrodes in the electrolytic cell equipped with the prepared electrolyte, ventilate and stir; quickly raise the voltage to 420V at room temperature and keep it for 12 minutes.

[0021] After the above steps, the Q235 low-carbon steel whose surface is covered with a uniform DLC composite oxide film is finally obtained.

[0022] The workpiece was cut and mounted with bakelite powder. Aft...

Embodiment 2

[0024] According to the same method as in Example 1, the Q235 low-carbon steel sample was pretreated, the electrolyte was prepared, and the low-carbon steel was subjected to cathodic micro-arc oxidation treatment. The difference from Example 1 is that in this example, the electrolyte components are methanol 240mL, ethanolamine 300mL, urea 200g, nickel sulfate 15g, nano carbon powder 15g, sodium chloride 80g, deionized water 560mL. Apply a voltage of 350V for 4 minutes.

[0025] After the above steps, the Q235 low-carbon steel whose surface is covered with a uniform DLC composite oxide film is finally obtained. The thickness of the composite oxide film measured by the same method as in Example 1 was 25 μm, and the microhardness of the film layer was 610 HV.

Embodiment 3

[0027] According to the same method as in Example 1, the Q235 low-carbon steel sample was pretreated, the electrolyte was prepared, and the low-carbon steel was subjected to cathodic micro-arc oxidation treatment. The difference is that in this example, 280mL of methanol, 200mL of ethanolamine, 300g of urea, 15g of nickel sulfate, 30g of nano-carbon powder, 100g of sodium chloride, and 450mL of deionized water are contained in the electrolyte. Apply a voltage of 520V for 12 minutes.

[0028] After the above steps, the Q235 low-carbon steel whose surface is covered with a uniform DLC composite oxide film is finally obtained. The thickness of the composite oxide film measured by the same method as in Example 1 was 100 μm, and the microhardness of the film layer was 1150 HV.

[0029] The Raman spectrum of the DLC composite oxide film was detected by a Horiba LabRAM Aramis Raman spectrometer, and it was determined that the film layer contained diamond-like carbon (DLC) components...

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Abstract

The invention discloses a solution and method for preparing a diamond-like carbon (DLC) composite oxidation film on a steel surface by a cathodic micro-arc oxidation method, and belongs to the field of material surface treatment. The solution is an aqueous solution and comprises the components of 10-15% of methyl alcohol, 15-30% of cholamine, 10-25% of urea, 1-5% of nickel sulfate, 1-4% of nanometer carbon powder, 5-10% of sodium chloride and 25-55% of deionized water. The concrete method comprises the steps of using a steel workpiece to be processed as cathode, using graphite as anode, and immersing the steel workpiece to be processed and the graphite together in an electrolytic cell containing with the solution; rapidly increasing voltage to 250-550 V at room temperature, keeping for 2-15min, and thus generating the DLC composite oxidation film on the steel surface, wherein the thickness of the DLC composite oxidation film is 20-100 Mu m, the highest hardness can be up to1200 HV andare more than four times larger than a matrix. The method has the advantages of simple process, wide range of applicable materials and high treatment efficiency, and the hardness and friction resistance of steel materials are improved remarkably.

Description

technical field [0001] The invention belongs to the field of material surface treatment, and relates to a solution and a method for preparing a DLC composite oxide film on a steel surface by using a cathodic micro-arc oxidation method. The treated steel material can improve its hardness and wear resistance. Background technique [0002] Steel is widely used as the most common metal material, but most types of steel materials, especially low carbon steel, have low hardness and poor wear resistance. Steel parts with high wear resistance requirements usually need surface strengthening treatment to improve its wear resistance and corrosion resistance. Common surface treatment methods include quenching heat treatment, laser hardening, gas carburizing, vacuum carburizing, ion nitriding and Boronizing etc. Patents 200710050131.0 and 200880005440.9 are traditional methods of obtaining carburized layers on steel surfaces. [0003] Micro-arc oxidation is a metal material surface tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/34C25D15/00
CPCC25D11/026C25D11/34C25D15/00
Inventor 薛文斌张亦凡余佳浩魏克俭金小越杜建成
Owner BEIJING NORMAL UNIVERSITY
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