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Cast aluminum alloy with pinholes removed and smelting method thereof

A casting aluminum alloy and pinhole technology, which is applied in the field of casting aluminum alloy, can solve the problems of corrosion resistance, corrosion, and loss of protection of castings, and achieve high heat treatability, enhanced alloy strength, and improved strength and hardness.

Inactive Publication Date: 2012-04-18
GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, pinholes also have a great influence on the corrosion resistance of castings
The corrosion resistance of aluminum mainly depends on a dense oxide film on the surface (Al 2 o 3 ), the pinholes make the oxide film structure loose to varying degrees, which reduces the chemical stability of the oxide film, becomes the source of corrosion, and even loses its protective effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A cast aluminum alloy, in terms of mass percentage, including 0.7% Si, 0.4% Fe, 0.1% Cu, 0.1% Mn, 0.4% Mg, 0.15% Zn, 0.01% Ti , 0.8% of Mo, 0.09% of B, 0.06% of Li, the balance is Al and unavoidable impurities, the content of each impurity is not more than 0.05% of the total mass percentage, and the content of all impurities is not more than 0.05% of the total mass percentage 0.1%.

[0027] The present invention also provides a method for preparing the cast aluminum alloy, adding MoB and LiAlH in a composite treatment 4 , including the following steps:

[0028] Step 1: Prepare materials according to the composition of the cast aluminum alloy, including 0.7-1.1% of Si, less than or equal to 0.4% of Fe, 0.1-0.4% of Cu, 0.1-0.3% of Mn, 0.4-0.4% of the total product mass percentage 0.8% Mg, less than or equal to 0.15% Zn, 0.01-0.04% Ti;

[0029] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat it to melt it completely, ad...

Embodiment 2

[0033] Embodiment 2: A cast aluminum alloy, in terms of mass percentage, including 0.91% Si, 0.3% Fe, 0.3% Cu, 0.2% Mn, 0.6% Mg, 0.1% Zn, 0.03% Ti , 1.1% Mo, 0.12% B, 0.08% Li, the balance is Al and unavoidable impurities, the content of each impurity does not exceed 0.05% of the total mass percentage, and the content of all impurities does not exceed 0.05% of the total mass percentage 0.1%.

[0034] The present invention also provides a method for preparing the cast aluminum alloy, adding MoB and LiAlH in a composite treatment 4 , including the following steps:

[0035]Step 1: preparing materials according to the components of the cast aluminum alloy, including 0.91% Si, 0.3% Fe, 0.3% Cu, 0.2% Mn, 0.6% Mg, 0.1% Zn, 0.03% Ti;

[0036] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat it to melt it completely, add the materials prepared in Step 1 first according to the formula ratio, make it completely dissolved and melted, and heat it at 7...

Embodiment 3

[0040] Embodiment 3: A cast aluminum alloy, in terms of mass percentage, including 1.1% Si, 0.29% Fe, 0.4% Cu, 0.3% Mn, 0.8% Mg, 0.08% Zn, 0.04% Ti , 1.4% of Mo, 0.16% of B, 0.1% of Li, the balance is Al and unavoidable impurities, the content of each impurity is not more than 0.05% of the total mass percentage, and the content of all impurities is not more than 0.05% of the total mass percentage 0.1%.

[0041] The present invention also provides a method for preparing the cast aluminum alloy, adding MoB and LiAlH in a composite treatment 4 , including the following steps:

[0042] Step 1: preparing materials according to the components of the cast aluminum alloy, including 1.1% Si, 0.29% Fe, 0.4% Cu, 0.3% Mn, 0.8% Mg, 0.08% Zn, 0.04% Ti;

[0043] Step 2: Add aluminum ingots or molten aluminum into the smelting furnace first, heat it to melt it completely, add the materials prepared in Step 1 first according to the formula ratio, make it completely dissolved and melted, and...

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Abstract

The invention discloses a cast aluminum alloy with pinholes removed and a smelting method thereof. The smelting method comprises the steps of: firstly, heating an aluminum ingot or molten aluminum for completely melting the aluminum ingot or molten aluminum; adding Si, Fe, Cu, Mn, Mg, Zn and Ti, and completely dissolving and melting the added components; refining, and maintaining the temperature at 700-1000 DEG C to obtain alloy melt; degassing and purifying the alloy melt by using nitrogen or inert gas or mixed gas of nitrogen and inert gas at any ratio, and persistently introducing the gas until reaction is finished; simultaneously adding MoB and LiAlH4 powder to the alloy melt in a fluidized manner along with the gas; stirring to make MoB and LiAlH4 be uniformly distributed in the alloy melt and sufficiently react with the alloy melt; and standing, adjusting the temperature to 680-730 DEG C, discharging the molten alloy out of a furnace and carrying out casting production. According to the cast aluminum alloy with pinholes removed and the smelting method thereof, the defects of the performance of the traditional aluminum alloy are overcome, the tenacity, forming performance andhardenability of the aluminum alloy are improved, and high-grade base materials are provided for high-efficiency deep processing.

Description

technical field [0001] The invention relates to a cast aluminum alloy and also relates to its melting method. Background technique [0002] Pinholes are a common defect in cast aluminum alloys. When the aluminum alloy is smelting and pouring, the alloy liquid can dissolve more hydrogen. Under normal pressure, the solubility of hydrogen increases with the increase of the temperature of the alloy liquid, and decreases with the decrease of the temperature. When aluminum changes from a liquid state to a solid state, the solubility of hydrogen in aluminum suddenly decreases. Therefore, more hydrogen is precipitated to form hydrogen bubbles, and it is too late to float up and discharge, so a large number of small and scattered pores are formed, which are called pinholes. Under normal production conditions, it is difficult to avoid the occurrence of pinholes, especially in thick sand castings. Pinholes in castings are more serious when melting and pouring in an environment with ...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/02
Inventor 门三泉张中可车云
Owner GUIZHOU ALUMINUM MATERIALS ENG TECHRES CENT
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