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Preparation method for 2XXX aluminum and aluminum alloy surface high-wear-resistance self-lubricating micro-arc oxide film layer

A technology of aluminum alloy surface, micro-arc oxidation, applied in surface reaction electrolytic coating, anodizing, coating and other directions, can solve problems such as high cost, complexity, lubrication failure, etc., achieve uniform thickness, reduce instantaneous current impact, combine good effect

Active Publication Date: 2018-12-18
FUJIAN LONGXI BEARING (GROUP) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some of these methods are more complicated in process, and some are more costly, and once the anti-friction layer is worn out, lubrication failure will occur

Method used

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  • Preparation method for 2XXX aluminum and aluminum alloy surface high-wear-resistance self-lubricating micro-arc oxide film layer
  • Preparation method for 2XXX aluminum and aluminum alloy surface high-wear-resistance self-lubricating micro-arc oxide film layer
  • Preparation method for 2XXX aluminum and aluminum alloy surface high-wear-resistance self-lubricating micro-arc oxide film layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Material preparation: After the 2A12 aluminum alloy is cut and polished, it is cleaned and degreased by ultrasonic waves in acetone solution.

[0034] 2. DC copper-rich passivation: In the passivation electrolyte, water glass 20g / L, sodium adipate 5g / L, stabilizer 2g / L, and the rest is water. The temperature is 20-45°C, and it is treated for 10 minutes. After taking it out, it is immediately washed with tap water for 1-2 minutes, and then with deionized water for 1-2 minutes. The thickness of the obtained copper-rich dense passivation film is 2 µm.

[0035] 3. AC α-Al 2 o 3Sintering of self-lubricating dense film layer: In the electrolyte, sodium gluconate 20g / L, sodium silicate 2g / L, molybdenum disulfide 10g / L, sodium borate 5g / L, combustion agent 2g / L, and the rest is water.

[0036] The first stage: oxidation time: 60min, forward voltage: 400V, forward current density: 2A / cm 2 , negative voltage: 60V, negative current density: 3A / cm 2 , Pulse frequency: 400Hz;...

Embodiment 2

[0041] 1. Material preparation: After the 2A16 aluminum alloy is cut and polished, it is cleaned and degreased by ultrasonic in acetone solution.

[0042] 2. DC copper-rich passivation: In the passivation electrolyte, water glass 30g / L, sodium adipate 8g / L, stabilizer 2g / L, and the rest is water. The temperature is 20-45°C, and it is treated for 20 minutes. After taking it out, it is immediately washed with tap water for 1-2 minutes, and then with deionized water for 1-2 minutes. The thickness of the obtained copper-rich dense passivation film is 5 µm.

[0043] 3. AC α-Al 2 o 3 Sintering of self-lubricating dense film layer: In the electrolyte, sodium gluconate 20g / L, sodium silicate 3g / L, molybdenum disulfide 20g / L, sodium borate 2g / L, combustion agent 5g / L, and the rest is water.

[0044] The first stage: oxidation time: 80min, forward voltage: 450V, forward current density: 3A / cm 2 , negative voltage: 80V, negative current density: 3A / cm 2 , Pulse frequency: 400Hz; posi...

Embodiment 3

[0049] 1. Material preparation: After the 2A70 aluminum alloy is cut and polished, it is cleaned and degreased by ultrasonic in acetone solution.

[0050] 2. DC copper-rich passivation: In the passivation electrolyte, water glass 15g / L, sodium adipate 8g / L, stabilizer 3g / L, and the rest is water. The temperature is 20-45°C, and it is treated for 20 minutes. After taking it out, it is immediately washed with tap water for 1-2 minutes, and then with deionized water for 1-2 minutes. The thickness of the obtained copper-rich dense passivation film is 5 µm.

[0051] 3. AC α-Al 2 o 3 Sintering of self-lubricating dense film layer: In the electrolyte, sodium gluconate 30g / L, sodium silicate 3g / L, molybdenum disulfide 15g / L, sodium borate 2g / L, combustion agent 5g / L, and the rest is water.

[0052] The first stage: oxidation time: 80min, forward voltage: 450V, forward current density: 2A / cm 2 , negative voltage: 80V, negative current density: 5A / cm 2 , Pulse frequency: 200Hz; posi...

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Abstract

The invention relates to a preparation method for a 2XXX aluminum and aluminum alloy surface high-wear-resistance self-lubricating micro-arc oxide film layer. The preparation method comprises preparation of a direct-current copper-rich passivating film layer, and sintering of an alternating-current alpha-Al2O3 self-lubricating compact film layer, wherein in preparation of the direct-current copper-rich passivating film layer, a used electrolyte solution is sodium oxalate, a copper complexing agent, sodium silicate and the like; sintering of the alternating-current alpha-Al2O3 self-lubricatingcompact film layer is performed in an electrolyte solution system containing an organic combustion agent, wherein potassium (sodium) gluconate is main salt, potassium (sodium) borate is an additive, tartaric acid is a combustion agent, sodium silicate and sodium hydroxide are a stabilizer, molybdenum disulfide, graphite and the like are self-lubricating particles; the combustion agent is added, sothat the micro-arc oxide film realizes high-temperature-phase conversion, and can be sufficiently sintered with the self-lubricating particles; and the obtained alpha-Al2O3 self-lubricating compact film layer has a relatively thick compact layer, has relatively high hardness and wear resistance, and is firmly combined with matrix. The preparation method can realize automatic control, and has theadvantages of being simple to operate, adopting cheap equipment, being environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a method for preparing a highly wear-resistant self-lubricating micro-arc oxidation film on the surface of 2XXX aluminum and aluminum alloys. Background technique [0002] Al-Cu-Mg (2XXX series) aluminum alloy belongs to aviation aluminum, which is a kind of heat-resistant duralumin. Its characteristic is that the strength is not too high at room temperature, but it has high creep strength at high temperature. The alloy has strong plasticity in hot state, no extrusion effect, and can be processed and strengthened. Spot welding, seam welding and other welding properties are good, the tendency to form cracks is not obvious, and the weld air tightness and machinability are good. [0003] Although aluminum alloy has great advantages in light weight, due to its low hardness, poor wear resistance and corrosion resistance, for high friction applications, the surface of...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D15/00
CPCC25D11/024C25D11/026C25D11/06C25D15/00
Inventor 张伟陈志雄朱圣龙王艺农张丽盆陈巧燕
Owner FUJIAN LONGXI BEARING (GROUP) CO LTD
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