High-strength die-casting aluminum alloy and processing technology thereof

A technology of casting aluminum alloy and processing technology, applied in the field of high-strength die-casting aluminum alloy and its processing technology, can solve the problems of thin natural oxide film thickness, unsuitable for heat treatment, uneconomical, etc., to improve corrosion resistance, improve mechanical performance and anti-corrosion performance, the effect of improving mechanical properties

Inactive Publication Date: 2022-06-03
海安宏宇合金材料有限公司
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AI-Extracted Technical Summary

Problems solved by technology

In fact, die castings are not suitable for heat treatment, and it is easy to cause quality risks such as deformation and foaming of castings, and it is not economical and the purpose of the country's advocacy of energy saving and emission ...
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Method used

Conclusion: From the comparison of Example 7 and Example 6, it can be seen that the modified hydrotalcite film layer on the aluminum alloy can play a role in corrosion resistance. After modification, the modified film layer effectively isolates the...
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Abstract

The invention discloses a high-strength die-casting aluminum alloy and a processing technology thereof. The prepared aluminum alloy material comprises aluminum, silicon, iron, copper, manganese and magnesium. La and Yb are added, the prepared rare earth aluminum alloy is good in quality and compact in structure through intermittent ultrasonic treatment, aluminum oxide, magnesium oxide, lanthanum oxide, ytterbium oxide and other inclusions are removed through ceramic foam filtration, the rare earth aluminum alloy prepared through the method is added into an aluminum alloy melt, and the rare earth aluminum alloy is obtained. And the mechanical property of the aluminum alloy is obviously improved. And meanwhile, the aluminum alloy is coated with a hydrotalcite film layer prepared from vanillin L-aspartic acid disodium salt, the film layer is modified through perfluorooctyltriethoxysilane, and the corrosion resistance of the aluminum alloy is improved.

Application Domain

Technology Topic

Examples

  • Experimental program(7)
  • Effect test(1)

Example Embodiment

[0018] Example 1:
Step 1: take the primary aluminum for heating and melting, the melting temperature is 685 ℃; add metal silicon, heat up and melt, the melting temperature is 765 ℃; at 740 ℃, add copper, iron, magnesium, manganese, melt at 740 ℃, static Set for 7min to obtain a melt.
[0019] Step 2: Refining treatment: compress ammonium chloride and perchloroethane into blocks, add them into the melt, set the melt temperature to 740°C, degas for 1.5 minutes, and let stand for 15 minutes.
[0020] Step 3: heating the ceramic foam to 190°C, and filtering when the aluminum alloy melt temperature reaches 780°C.
[0021] Step 4: Take the primary aluminum for heating and melting, and the melting temperature is 685°C; add rare earth La, rare earth Yb, Al-Ti-B refiner, Ti, Mo, stir for 1.5 hours, keep the temperature for 65 minutes, and perform intermittent ultrasonic treatment. The temperature of the aluminum melt is lowered to 710° C., refining treatment, heating the ceramic foam to 200° C., filtering with the ceramic foam, and casting to obtain a rare-earth aluminum alloy. The ultrasonic output frequency was 1.5KHZ, the ultrasonic time was 20min, the ultrasonic application time was 76s each time, and the intermittent time was 76s.
[0022] Step 5: Take the rare earth aluminum alloy and strontium, add them into the aluminum alloy melt, carry out air blowing treatment with 99.99% pure nitrogen, and let stand to obtain an aluminum alloy solution. The aluminum alloy ingot is sent to the side furnace of the die-casting machine to be melted and produced by die-casting. The die-casting process parameters are: casting temperature of 705°C, mold preheating temperature of 265°C, casting boost pressure of 300MPa, and injection speed of 4m/s. Alloy die casting samples. The die-casting sample obtained in this example is a thin-walled casting with a thickness of 3 mm. The chemical composition is: silicon 7.8%, iron 0.2%, copper 0.2%, manganese 0.7%, magnesium 0.2%, strontium 0.2%, lanthanum 0.1%, ytterbium 0.1%, ammonium chloride 0.4%, perchloroethane 0.4% %, titanium 0.2%, molybdenum 0.2%, the rest are aluminum and inevitable impurities.
[0023] Step 6: Dissolve 0.003 mol L-aspartic acid and 0.006 mol NaOH in a sufficient amount of anhydrous methanol, stir for 45 min to obtain solution A; take vanillin and anhydrous methanol, stir evenly, add solution A dropwise, and stir for 1.5 h , rotary steam at 60°C, suction filtration, washing, and drying to obtain disodium vanillin L-aspartate; add 2g lithium nitrate, 1g lithium hydroxide, 0.6 g vanillin acetal L-day in deionized water disodium aspartate, stirred for 1.5h to obtain a mixed solution, immersed the aluminum alloy die-casting sample in the mixed solution, reacted at 55 ℃ for 25 min, took out the aluminum alloy die-casting sample, rinsed clean, dried at 85 ℃ for 20 min, After cooling, an aluminum alloy with a hydrotalcite film layer was obtained.
[0024] Step 7: Mix 0.4g of perfluorooctyltriethoxysilane and 0.2ml of deionized water evenly, stir for 1.5h to obtain a mixed solution, and place the prepared aluminum alloy with a hydrotalcite film layer in the mixed solution , the temperature was raised to 120 °C, and the reaction was performed for 13 h to obtain an aluminum alloy.

Example Embodiment

[0025] Example 2:
Step 1: Take the primary aluminum for heating and melting, the melting temperature is 650 ℃; add metal silicon, heat up and melt, the melting temperature is 730 ℃; at 730 ℃, add copper, iron, magnesium, manganese, melt at 730 ℃, static Set for 5min to obtain a melt.
[0026] Step 2: Refining treatment: compress ammonium chloride and perchloroethane into blocks, add them into the melt, set the melt temperature to 730°C, degas for 1 min, and let stand for 10 min.
[0027] Step 3: heating the ceramic foam to 190°C, and filtering when the aluminum alloy melt temperature reaches 770°C.
[0028]Step 4: Take the primary aluminum for heating and melting, and the melting temperature is 650°C; add rare earth La, rare earth Yb, Al-Ti-B, Ti, Mo, stir for 1 hour, keep the temperature for 60 minutes, perform intermittent ultrasonic treatment, and adjust the temperature of the primary aluminum melt to The temperature is lowered to 700° C., refining treatment, heating the ceramic foam to 190° C., filtering with the ceramic foam, and casting to obtain a rare earth aluminum alloy. The ultrasonic output frequency was 1.5KHZ, the ultrasonic time was 15min, the ultrasonic application time was 71s each time, and the intermittent time was 71s.
[0029] Step 5: Take rare earth aluminum alloy and strontium, add them into the aluminum alloy melt, carry out air blowing treatment with 99.99% pure nitrogen, and let stand to obtain an aluminum alloy solution, making the temperature of the aluminum alloy solution to be 690° C. The aluminum alloy ingot is sent to the side furnace of the die-casting machine to be melted and produced by die-casting. The die-casting process parameters are: casting temperature of 700 ° C, mold preheating temperature of 260 ° C, casting boost pressure of 300 MPa, and injection speed of 4 m/s to obtain aluminum alloy. Alloy die casting samples. The die-casting sample obtained in this example is a thin-walled casting with a thickness of 3 mm. The chemical composition is: silicon 7.8%, iron 0.2%, copper 0.2%, manganese 0.7%, magnesium 0.2%, strontium 0.2%, lanthanum 0.1%, ytterbium 0.1%, ammonium chloride 0.4%, perchloroethane 0.4% %, titanium 0.2%, molybdenum 0.2%, the rest are aluminum and inevitable impurities.
[0030] Step 6: Dissolve 0.003 mol L-aspartic acid and 0.006 mol NaOH in a sufficient amount of anhydrous methanol, stir for 40 min to obtain solution A; take vanillin and anhydrous methanol, stir evenly, add solution A dropwise, stir for 1 h, Rotary evaporation at 55°C, suction filtration, washing and drying to obtain disodium vanillin L-aspartate; add 2g lithium nitrate, 1g lithium hydroxide, 0.6 g vanillin L-aspartate in deionized water disodium citrate, stirred for 1 h to obtain a mixed solution, immersed the aluminum alloy die-casting sample in the mixed solution, reacted at 50 °C for 20 min, took out the aluminum alloy die-casting sample, rinsed clean, dried at 80 °C for 15 min, cooled, An aluminum alloy with a hydrotalcite film layer was obtained.
[0031] Step 7: Mix 0.4g of perfluorooctyltriethoxysilane and 0.2ml of deionized water evenly, stir for 1 hour to obtain a mixed solution, and place the prepared aluminum alloy with a hydrotalcite film layer in the mixed solution , the temperature was raised to 115 °C, and the reaction was performed for 12 h to obtain an aluminum alloy.

Example Embodiment

[0032] Example 3:
Step 1: Take primary aluminum for heating and melting, the melting temperature is 720 °C; add metal silicon, heat up and melt, and the melting temperature is 800 °C; at 750 °C, add copper, iron, magnesium, manganese, and melt at 750 °C, static Set for 10min to obtain a melt.
[0033] Step 2: Refining treatment: Compress ammonium chloride and perchloroethane into blocks, add them into the melt, set the melt temperature to 750°C, degas for 2 minutes, and let stand for 20 minutes.
[0034] Step 3: heating the ceramic foam to 200°C, and filtering when the aluminum alloy melt temperature reaches 790°C.
[0035] Step 4: Take the primary aluminum for heating and melting, and the melting temperature is 720°C; add rare earth La, rare earth Yb, Al-Ti-B, Ti, Mo, stir for 2 hours, keep the temperature for 70 minutes, perform intermittent ultrasonic treatment, and adjust the temperature of the primary aluminum melt to The temperature is lowered to 720° C., refining treatment, heating the ceramic foam to 210° C., filtering with the ceramic foam, and casting to obtain a rare earth aluminum alloy. The ultrasonic output frequency is 1.5KHZ, the ultrasonic time is 25min, the ultrasonic application time is 80s each time, and the intermittent time is 80s.
[0036] Step 5: Take rare earth aluminum alloy and strontium, add them into the aluminum alloy melt, carry out air blowing treatment with 99.99% pure nitrogen gas, and let stand to obtain an aluminum alloy solution. The temperature of the aluminum alloy solution is 720° C. The aluminum alloy ingot is sent to the side furnace of the die-casting machine to be melted and produced by die-casting. The die-casting process parameters are: casting temperature of 710 °C, mold preheating temperature of 270 °C, casting boost pressure of 300 MPa, and injection speed of 4 m/s. Alloy die casting samples. The die-casting sample obtained in this example is a thin-walled casting with a thickness of 3 mm. The chemical composition is: silicon 7.8%, iron 0.2%, copper 0.2%, manganese 0.7%, magnesium 0.2%, strontium 0.2%, lanthanum 0.1%, ytterbium 0.1%, ammonium chloride 0.4%, perchloroethane 0.4% %, titanium 0.2%, molybdenum 0.2%, the rest are aluminum and inevitable impurities.
[0037] Step 6: Dissolve 0.003 mol L-aspartic acid and 0.006 mol NaOH in a sufficient amount of anhydrous methanol, stir for 50 min to obtain solution A; take vanillin and anhydrous methanol, stir evenly, add solution A dropwise, stir for 2 h, Rotary steam at 65°C, suction filtration, washing and drying to obtain disodium vanillin L-aspartate; add 2g lithium nitrate, 1g lithium hydroxide, 0.6 g vanillin L-aspartate in deionized water Disodium carbamide, stir for 1~2h to obtain a mixed solution, immerse the aluminum alloy die-casting sample in the mixed solution, react at 60°C for 30min, take out the aluminum alloy die-casting sample, rinse clean, and dry at 80~90°C 25min, cooled to obtain an aluminum alloy with a hydrotalcite film layer.
[0038] Step 7: Mix 0.4g of perfluorooctyltriethoxysilane and 0.2ml of deionized water evenly, stir for 2h to obtain a mixed solution, and place the prepared aluminum alloy with a hydrotalcite film layer in the mixed solution , the temperature was raised to 125 ° C, and the reaction was performed for 14 h to obtain an aluminum alloy.
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PUM

PropertyMeasurementUnit
Thickness3.0mm
Tensile strength285.0MPa
Hardness67.0 ~ 74.0
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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