A method for preparing seawater corrosion-resistant aluminum alloy

Abstract

The invention discloses a method for preparing a seawater corrosion resistant aluminum alloy. First, a crucible containing a pure aluminum ingot is placed in a medium frequency melting furnace, and an inert gas protective gas is introduced after vacuuming to control the temperature in the medium frequency melting furnace to be 800-850 DEG C. When the pure aluminum is completely melted, a certain amount of aluminum-vanadium master alloy is added, and the temperature in the medium frequency melting furnace is controlled to be 1250-1350 DEG C. After maintaining for 15-30 minutes, the temperature is lowered to control the temperature in the medium frequency melting furnace to be 750-850 DEG C, and then a certain amount of magnesium stannate is added, and the temperature is controlled to be maintained for 30-45 minutes, and the melting is complete to obtain the seawater corrosion resistant aluminum alloy. The preparation method of the invention has wide raw material sources, is environmentally friendly, safe and controllable, has a simple process, and is easy to industrialize.

Description

Technical Field

[0001] The invention relates to aluminum alloy preparation technology and alloy corrosion resistance modification technology, and specifically to a method for preparing seawater corrosion-resistant aluminum alloy. Background Art

[0002] Aluminum alloys have excellent properties such as low density, high strength, and good electrical conductivity. They have been widely used in aviation, marine engineering, chemical industry and other fields, and have broad market and application prospects. However, aluminum alloys will corrode in corrosive environments such as the atmosphere and the ocean, affecting their service life and performance. Therefore, in response to the corrosion problem of aluminum alloys, researchers have carried out a series of technical measures, including improving the alloy structure, enhancing the corrosion-resistant adhesion layer, and using appropriate corrosion inhibitors.

[0003] Vanadium is a corrosion-resistant material. Adding an appropriate amount of vanadium to aluminum alloys can improve their corrosion resistance. Vanadium can promote the precipitation hardening of aluminum alloys and inhibit the precipitation of hydrogen, thereby improving the mechanical properties and corrosion resistance of aluminum alloys. Magnesium stannate is a corrosion-resistant adhesion layer with good stability and film-forming properties. Adding magnesium stannate to corrosion-resistant aluminum alloys can form a dense adhesion layer, which blocks the contact between the aluminum alloy surface and the environmental corrosive medium, thereby protecting the aluminum alloy. Magnesium stannate is a corrosion-resistant adhesion layer with good stability and film-forming properties. Adding magnesium stannate to corrosion-resistant aluminum alloys can form a dense adhesion layer, which blocks the contact between the aluminum alloy surface and the environmental corrosive medium, thereby protecting the aluminum alloy.

[0004] Currently, there is no document disclosed that is identical with the technical solution of the present invention. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing a seawater corrosion-resistant aluminum alloy, so as to solve the defects that the current aluminum alloy will corrode in corrosive environments such as the atmosphere and the ocean, thus affecting its service life and performance. Therefore, developing an aluminum alloy that is easy to prepare and process and can withstand seawater corrosion is one of the research focuses of corrosion-resistant modification of aluminum alloy materials. The present invention prepares a seawater corrosion-resistant aluminum alloy by introducing vanadium-magnesium stannate, which can effectively improve the corrosion resistance of the material in a seawater environment.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for preparing a seawater corrosion-resistant aluminum alloy, the method steps are as follows:

[0008] (1) First, place the crucible containing pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce inert gas protection gas, and control the temperature in the medium frequency melting furnace to 800-850℃;

[0009] (2) When pure aluminum is completely melted, add a certain amount of aluminum-vanadium master alloy and control the temperature in the medium frequency melting furnace to 1250-1350°C for 15-30 minutes;

[0010] The aluminum-vanadium master alloy is one of AlV55, AlV65, AlV75 and AlV85 described in YS / T 579-2014;

[0011] (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 750-850°C, then adding a certain amount of magnesium stannate, controlling the temperature to maintain for 30-45 minutes, and completely melting to obtain a seawater corrosion-resistant aluminum alloy.

[0012] When the pure aluminum and aluminum-vanadium master alloy are smelted, the temperature in the medium frequency smelting furnace is controlled to be 1250-1350° C. and maintained for 15-30 minutes;

[0013] When the aluminum alloy and magnesium stannate are smelted, the temperature in the medium frequency smelting furnace is controlled to be 750-850° C. and maintained for 30-45 minutes;

[0014] The seawater corrosion-resistant aluminum alloy is an aluminum alloy smelted from pure aluminum, aluminum-vanadium master alloy, and magnesium stannate; the mass ratio of pure aluminum to the aluminum-vanadium master alloy is 100:1 to 50:1, and the mass ratio of pure aluminum to magnesium stannate is 500:1 to 200:1.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The preparation method of the present invention is simple, low in cost, and has mild reaction conditions;

[0017] (2) The corrosion rate of the corrosion-resistant aluminum alloy product produced by the product of the present invention is V≤0.08mm / a in 3.5% salt water (ambient temperature 25°C);

[0018] (3) The preparation method of the present invention has a wide range of raw materials, is environmentally friendly, safe and controllable, has a simple process, and is easy to industrialize. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below through the attached tables and examples, but the protection scope of the present invention is not limited to the contents.

[0020] Embodiment 1:

[0021] A method for preparing a seawater corrosion-resistant aluminum alloy, the method steps are as follows:

[0022] (1) First, place a crucible containing 1 kg of pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce argon protective gas, and control the temperature in the medium frequency melting furnace to 800°C;

[0023] (2) When pure aluminum is completely melted, add 10g of AlV55 master alloy and control the temperature in the medium frequency melting furnace to 1250℃ and keep it for 15min;

[0024] (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 750°C, then adding 5 g of magnesium stannate, controlling the temperature and maintaining it for 30 min, and melting it completely to obtain a seawater corrosion-resistant aluminum alloy.

[0025] The seawater corrosion-resistant aluminum alloy prepared in this embodiment was tested for corrosion resistance in 3.5% NaCl solution + air (ambient temperature 25° C.), and the corrosion rate was 0.06 mm / a.

[0026] Embodiment 2:

[0027] A method for preparing a seawater corrosion-resistant aluminum alloy, the method steps are as follows:

[0028] (1) First, place a crucible containing 1 kg of pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce argon protective gas, and control the temperature in the medium frequency melting furnace to 850°C;

[0029] (2) When pure aluminum is completely melted, add 20g of AlV85 master alloy and control the temperature in the medium frequency melting furnace to 1350℃ and maintain it for 30min;

[0030] (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 850°C, then adding 2 g of magnesium stannate, maintaining the temperature for 40 min, and melting completely to obtain a seawater corrosion-resistant aluminum alloy.

[0031] The seawater corrosion-resistant aluminum alloy prepared in this embodiment was tested for corrosion resistance in 3.5% NaCl solution + air (ambient temperature 25° C.), and the corrosion rate was 0.08 mm / a.

[0032] Embodiment 3:

[0033] A method for preparing a seawater corrosion-resistant aluminum alloy, the method steps are as follows:

[0034] (1) First, place a crucible containing 1 kg of pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce argon protective gas, and control the temperature in the medium frequency melting furnace to 800°C;

[0035] (2) When pure aluminum is completely melted, add 15 g of AlV65 master alloy and control the temperature in the medium frequency melting furnace to 1300 °C for 15 min;

[0036] (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 800°C, then adding 3 g of magnesium stannate, controlling the temperature and maintaining it for 40 min, and melting it completely to obtain a seawater corrosion-resistant aluminum alloy.

[0037] The seawater corrosion-resistant aluminum alloy prepared in this embodiment was tested for corrosion resistance in 3.5% NaCl solution + air (ambient temperature 25° C.), and the corrosion rate was 0.05 mm / a.

[0038] Embodiment 4:

[0039] A method for preparing a seawater corrosion-resistant aluminum alloy, the method steps are as follows:

[0040] (1) First, place a crucible containing 1 kg of pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce argon protective gas, and control the temperature in the medium frequency melting furnace to 800°C;

[0041] (2) When pure aluminum is completely melted, add 15g of AlV75 master alloy and control the temperature in the medium frequency melting furnace to 1200℃ and maintain it for 15min;

[0042] (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 800°C, then adding 4 g of magnesium stannate, and maintaining the temperature for 40 minutes. After complete melting, a seawater corrosion-resistant aluminum alloy is obtained.

[0043] The seawater corrosion-resistant aluminum alloy prepared in this embodiment was tested for corrosion resistance in 3.5% NaCl solution + air (ambient temperature 25° C.), and the corrosion rate was 0.04 mm / a.

[0044] Embodiment 5:

[0045] A method for preparing a seawater corrosion-resistant aluminum alloy, the method steps are as follows:

[0046] (1) First, place a crucible containing 1 kg of pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce argon protective gas, and control the temperature in the medium frequency melting furnace to 800°C;

[0047] (2) When pure aluminum is completely melted, add 15 g of AlV55 master alloy and control the temperature in the medium frequency melting furnace to 1300 °C for 15 min;

[0048] (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 800°C, then adding 5 g of magnesium stannate, controlling the temperature and maintaining it for 35 minutes, and melting it completely to obtain a seawater corrosion-resistant aluminum alloy.

[0049] The seawater corrosion-resistant aluminum alloy prepared in this embodiment was tested for corrosion resistance in 3.5% NaCl solution + air (ambient temperature 25° C.), and the corrosion rate was 0.05 mm / a.

[0050] Table 1 shows the metal corrosion rates of the seawater corrosion-resistant aluminum alloys prepared in Examples 1-5 in 3.5% salt water (ambient temperature 25°C).

[0051]

Claims

1. A method for preparing a seawater corrosion-resistant aluminum alloy, characterized in that: The specific steps are as follows: (1) First, place the crucible containing pure aluminum ingot in a medium frequency melting furnace, evacuate the furnace, introduce inert gas protection gas, and control the temperature in the medium frequency melting furnace to 800-850℃; (2) When pure aluminum is completely melted, add a certain amount of aluminum-vanadium master alloy and control the temperature in the medium frequency melting furnace to 1250-1350°C for 15-30 minutes; (3) Cooling the aluminum material in step (2), controlling the temperature in the medium frequency melting furnace to 750-850°C, then adding a certain amount of magnesium stannate, controlling the temperature to maintain for 30-45 minutes, and melting completely to obtain a seawater corrosion-resistant aluminum alloy; The aluminum-vanadium master alloy is one of AlV55, AlV65, AlV75, and AlV85 described in YS / T 579-2014, the mass ratio of pure aluminum to the aluminum-vanadium master alloy is 100:1-50:1, and the mass ratio of pure aluminum to magnesium stannate is 500:1-200:1.

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