High-temperature-resistant and corrosion-resistant aluminum alloy capable of being used for high-pressure die-casting process

Abstract

The invention discloses a high-temperature-resistant and corrosion-resistant aluminum alloy capable of being used for a high-pressure die-casting process. The high-temperature-resistant and corrosion-resistant aluminum alloy comprises the following components in percentage by weight: greater than or equal to 94% of A00 aluminum and 2.0-2.5% of Ni; the content of Mn is 1.5%-2.0%; the Fe content is less than or equal to 0.5%; the content of Si is less than or equal to 0.5%; the content of Cu is less than or equal to 0.3%; the content of Mg is less than or equal to 0.3%; by controlling the aluminum-manganese-nickel alloy made of materials such as aluminum, manganese and nickel, the requirement of a high-pressure die-casting metal product can be met, the minimum wall thickness of the product can reach 1 mm, the average aluminum content of the aluminum-manganese-nickel alloy reaches 94%, die-casting forming is met, the demolding effect is good, filling is uniform, the product reduction phenomenon is avoided, and the production cost is reduced. The aluminum-manganese-nickel alloy is free of deformation, slump and bubbling on the surface during high temperature implementation, the high temperature resistance and corrosion resistance of the aluminum-manganese-nickel alloy are improved, the melting point of the aluminum-manganese-nickel alloy is larger than 630 DEG C, the extensibility and tensile strength are improved, and the reliability and safety of the light alloy material applied to the gas cooker industry are improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-pressure die-casting alloys, in particular to a high-temperature-resistant and corrosion-resistant aluminum alloy that can be used in a high-pressure die-casting process, and the minimum wall thickness of the product can be 1 mm. Background Art

[0002] Since the aluminum alloy die-casting parts required by customers are both functional structural parts and appearance parts, and are in a special working environment of long-term high temperature (450℃), the thermal stability and corrosion resistance of raw materials under high temperature conditions are very high. Therefore, the material must have a low alloy content to meet its special needs of high melting point (>630℃), and at the same time, it is required to have a certain comprehensive strength.

[0003] The existing standard series of die-cast aluminum alloys all belong to the category of high alloy content. Although the comprehensive physical properties are high, the melting points are generally low and the oxidation resistance is insufficient. For example, the average melting point of aluminum-silicon series aluminum alloys is 575℃-585℃, the average melting point of aluminum-silicon-copper series aluminum alloys is 540℃-565℃, and the average melting point of aluminum-silicon-magnesium series aluminum alloys is 570℃-580℃, which can no longer meet customers' technical requirements for such parts.

[0004] Once the pure aluminum content in the existing aluminum alloy exceeds 90%, some problems such as poor demoulding effect, uneven filling and product shrinkage will occur during the die-casting process. Therefore, aluminum alloy metal materials with a pure aluminum content exceeding 90% are not suitable for die-casting products. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a high-temperature and corrosion-resistant aluminum alloy that can be used for the needs of high-pressure die-casting process, which effectively solves the problem that once the pure aluminum content in the existing aluminum alloy exceeds 90%, some problems such as poor demoulding effect, uneven filling and product shrinkage will occur during the die-casting process. Therefore, the aluminum alloy metal material with a pure aluminum content exceeding 90% is not suitable for die-casting products.

[0006] The technical solution is a high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process, including the following weight backup ratio components: A00 aluminum content is greater than or equal to 94%,

[0007] Ni content is 2.0%-2.5%;

[0008] Mn content is 1.5%-2.0%;

[0009] Fe content is less than or equal to 0.5%;

[0010] Si content is less than or equal to 0.5%;

[0011] Cu content is less than or equal to 0.3%;

[0012] Mg content is less than or equal to 0.3%, and the rest is Al and other unavoidable impurity elements;

[0013] S1, an aluminum-nickel master alloy having a Ni content of 15%;

[0014] S2, an aluminum-manganese master alloy having a Mn content of 15%;

[0015] S3, dissolving the A00 aluminum ingot, and when the dissolving temperature reaches 760°C, gradually adding the prepared aluminum-nickel master alloy and aluminum-manganese master alloy according to the composition;

[0016] S4, after the alloy components are fully melted, heating is stopped to carry out refining and degassing, and then the temperature is cooled down to 740℃ for ingot casting.

[0017] Preferably, the harmful substance content in the die-cast aluminum alloy is controlled as follows: the Pb content is less than or equal to 0.1%;

[0018] Hg content is less than or equal to 0.1%;

[0019] The Cd content is less than or equal to 0.01%.

[0020] Preferably, in step S1, the smelting furnace is preheated to an appropriate temperature, and then aluminum is placed in the smelting furnace for heating and dissolution. After the aluminum is completely melted, the calculated nickel is slowly added. After the nickel is completely melted, the melt is fully stirred with a stirring rod so that the aluminum and nickel are evenly mixed to form an aluminum-nickel intermediate alloy, wherein the aluminum content is 85% and the nickel content is 15%.

[0021] Preferably, in step S2, the smelting furnace is preheated to an appropriate temperature, and then aluminum is placed in the smelting furnace for heating and dissolution. After the aluminum is completely melted, the calculated manganese is slowly added. After the manganese is completely melted, the melt is fully stirred with a stirring rod so that the aluminum and manganese are evenly mixed to form an aluminum-manganese intermediate alloy, wherein the aluminum content is 85% and the manganese content is 15%.

[0022] Preferably, in step S3, the smelting furnace is preheated to an appropriate temperature, and then the A00 aluminum ingot is placed in the smelting furnace for heating and dissolution. After the A00 aluminum ingot is completely melted and the solution temperature reaches 760°C, the configured aluminum-nickel master alloy and aluminum-manganese master alloy are gradually added, and the melt is fully stirred with a stirring rod so that the alloy solution is evenly mixed and melted.

[0023] Preferably, in step S4, heating is stopped after the alloy solution components are fully melted, the molten alloy is refined and degassed, and then the molten alloy is cooled and the aluminum-nickel-manganese alloy is cast when the temperature drops by 740°C.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The aluminum-manganese-nickel alloy of the present invention is made by controlling aluminum, manganese, nickel and other materials, and can meet the needs of high-pressure die-casting metal products. The minimum wall thickness of the product can be 1 mm, and the aluminum content of the aluminum-manganese-nickel alloy reaches 94% on average, which meets the requirements of die-casting molding, has good demoulding effect, is evenly filled and does not shrink the product. The aluminum-manganese-nickel alloy has no deformation, no melting collapse and no bubbling on the surface during high-temperature realization, which improves the high-temperature resistance and corrosion resistance of the aluminum-manganese-nickel alloy. The melting point of the aluminum-manganese-nickel alloy is greater than 630°C, and the ductility and tensile strength are improved at the same time, thereby improving the reliability and safety of the light alloy material in the gas cooker industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the process steps of the present invention for producing a high temperature resistant and corrosion resistant aluminum alloy required by a high pressure die casting process.

[0027] Figure 2 It is a data diagram of the aluminum-nickel-manganese alloy tensile specimen 1 of the present invention.

[0028] Figure 3 This is a data diagram of the aluminum-nickel-manganese alloy tensile specimen 2 of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Depend on Figures 1 to 3 Provided is a high temperature resistant and corrosion resistant aluminum alloy that can be used in a high pressure die casting process, comprising the following components in weight backup ratio: a base alloy ratio, A00 aluminum content greater than or equal to 94%;

[0031] The main alloy composition ratio is Ni content of 2.0%-2.5% and Mn content of 1.5%-2.0%;

[0032] Second, the alloy composition ratio is that the Fe content is less than or equal to 0.5%, the Si content is less than or equal to 0.5%, the Cu content is less than or equal to 0.3%, and the Mg content is less than or equal to 0.3%;

[0033] The content of harmful substances is controlled, with Pb content less than or equal to 0.1%, Hg content less than or equal to 0.1%, Cd content less than or equal to 0.01%, and the rest being Al and other unavoidable impurity elements;

[0034] The production process method comprises the following steps: S1, preparing an aluminum-nickel master alloy with a Ni content of 15%;

[0035] S2, an aluminum-manganese master alloy having a Mn content of 15%;

[0036] S3, dissolving the A00 aluminum ingot, and when the dissolving temperature reaches 760°C, gradually adding the prepared aluminum-nickel master alloy and aluminum-manganese master alloy according to the composition;

[0037] S4, after the alloy components are fully melted, heating is stopped to carry out refining and degassing, and then the temperature is cooled down to 740℃ for ingot casting.

[0038] According to the above steps, specifically, S1, preheat the smelting furnace to an appropriate temperature, then put aluminum into the smelting furnace for heating and dissolution, and after the aluminum is completely melted, slowly add the calculated nickel, and after the nickel is completely melted, use a stirring rod to fully stir the melt so that the aluminum and nickel are evenly mixed to form an aluminum-nickel intermediate alloy, wherein the aluminum content is 85% and the nickel content is 15%.

[0039] S2, preheating the melting furnace to an appropriate temperature, then putting aluminum into the melting furnace for heating and dissolving, and slowly adding the calculated manganese after the aluminum is completely melted. After the manganese is completely melted, using a stirring rod to fully stir the melt so that the aluminum and manganese are evenly mixed to form an aluminum-manganese intermediate alloy, wherein the aluminum content is 85% and the manganese content is 15%.

[0040] S3, preheating the melting furnace to an appropriate temperature, then putting the A00 aluminum ingot into the melting furnace for heating and dissolving, after the A00 aluminum ingot is completely melted and the solution temperature reaches 760°C, gradually adding the configured aluminum-nickel master alloy and aluminum-manganese master alloy, and using a stirring rod to fully stir the melt so that the alloy solution is evenly mixed and melted.

[0041] S4, after the alloy solution components are fully melted, the heating is stopped, the molten alloy is refined and degassed, and then the molten alloy is cooled down. When the temperature drops to 740°C, the aluminum-nickel-manganese alloy ingot is cast.

[0042] The data obtained from the experiment according to the above scheme are as follows: the testing of aluminum-nickel-manganese alloy includes testing of aluminum-nickel-manganese alloy chemical composition, testing of aluminum-nickel-manganese alloy physical properties, testing of aluminum-nickel-manganese alloy melting point, testing of high temperature resistance of aluminum-nickel-manganese alloy die-castings and testing of corrosion resistance of aluminum-nickel-manganese alloy die-castings.

[0043] Aluminum-nickel-manganese alloy melting point detection 1:

[0044] Specifically, the aluminum-nickel-manganese alloy was cut into 20 mm sheet specimens, and cyclic heating was performed and observed in sections;

[0045] The test instrument is a 500mm*500mm*500mm electric heating precision box-type high temperature furnace;

[0046] The test requires that the melting point of aluminum-nickel-manganese alloy is greater than 630°C.

[0047]

[0048] Aluminum-nickel-manganese alloy melting point detection 2:

[0049] Specifically, the test instrument is a 500mm*500mm*500mm electric heating precision box-type high temperature furnace;

[0050] Test method: high temperature baking method (10 cycles of testing);

[0051] The test requires that the sample be kept at an ambient temperature of 500°C for 2 hours. After natural cooling, visual inspection of the appearance is not allowed to show deformation, collapse, melting, or surface blistering.

[0052] Test based on standard, Xiongxin Die Casting Co., Ltd. corporate standard (QB / RZAL0001-2012)

[0053]

[0054]

[0055] like Figure 2 As shown, Al-Ni-Mn alloy tensile test 1:

[0056] Performance requirements: tensile strength greater than or equal to 160Mpa. Elongation greater than or equal to 6%; calculation standard, GB / T228-2002;

[0057] Specimen shape, bar;

[0058] Test speed, 5 mm / min;

[0059] Original gauge length, 50 mm;

[0060] Specimen diameter: 12 mm.

[0061] Test data table:

[0062]

[0063] like Figure 3 As shown, Al-Ni-Mn alloy tensile test 2:

[0064] Performance requirements: tensile strength greater than or equal to 160Mpa. Elongation greater than or equal to 6%;

[0065] Calculation standard, GB / T 228-2002;

[0066] Specimen shape, bar;

[0067] Test speed, 5 mm / min;

[0068] Original gauge length, 50 mm;

[0069] Specimen diameter: 12 mm.

[0070] Test data table:

[0071]

[0072] High temperature resistant die casting aluminum alloy A1Ni 3 Mn 2 (Aluminum-nickel-manganese alloy) and ADC12 aluminum alloy die castings" salt spray test comparison report:

[0073] Test conditions;

[0074] Salt water concentration (g / L), standard parameter value 50±5, test parameter value 50;

[0075] pH value of salt water, standard parameter value is 6.5-7.2, test parameter value is 7.0;

[0076] Spray volume (ml / 80cm 2 .h), standard parameter value 1.0~2.0, test parameter value 1.5;

[0077] Compressed air pressure (kgf / cm 2 ), standard parameter value 1.00±0.1, test parameter value 1.0;

[0078] Test chamber temperature (℃), standard parameter value 35±1, test parameter value 35;

[0079] Pressure barrel temperature (℃), standard parameter value 47±1, test parameter value 47;

[0080] Spray mode: continuous spray;

[0081] Spray time, 96H;

[0082] The test requirements shall comply with the corporate standard of Xiongxin Die Casting Co., Ltd. (QB / RZAL001-2012), namely "High temperature resistant die casting aluminum alloy A1Ni 3 Mn 2 "The die castings produced should meet the requirements of specific environmental appearance. The corrosion resistance of the appearance parts is better than that of the commonly used die casting aluminum alloy (ADC12);

[0083] Test samples, two pieces of ADC12 material, A1Ni 3 Mn 2The above four samples are produced by the same mold, the same equipment, the same process parameters, and the same surface shot blasting and passivation treatment. The corrosion resistance test is carried out after 24 hours of natural aging.

[0084]

[0085] By comparing the test results, it can be found that the aluminum-manganese-nickel alloy made by controlling aluminum, manganese, nickel and other materials can meet the needs of high-pressure die-casting metal products. The minimum wall thickness of the product can be 1mm, and the aluminum content of the aluminum-manganese-nickel alloy reaches an average of 94%, which meets the requirements of die-casting molding, good demoulding effect, uniform filling and no product shrinkage. The aluminum-manganese-nickel alloy has no deformation, no melting collapse, and no bubbling on the surface during high temperature realization, which improves the high temperature resistance and corrosion resistance of the aluminum-manganese-nickel alloy. The melting point of the aluminum-manganese-nickel alloy is greater than 630℃, which improves the elongation and tensile strength, and improves the reliability and safety of the lightweight alloy material in the gas cooker industry.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process, characterized in that: Compositions comprising the following weight backup ratios: A00 Aluminum content greater than or equal to 94%, Ni content is 2.0%-2.5%; Mn content is 1.5%-2.0%; Fe content is less than or equal to 0.5%; Si content is less than or equal to 0.5%; Cu content is less than or equal to 0.3%; Mg content is less than or equal to 0.3%, and the rest is Al and other unavoidable impurity elements; S1, an aluminum-nickel master alloy having a Ni content of 15%; S2, an aluminum-manganese master alloy having a Mn content of 15%; S3, dissolving the A00 aluminum ingot, and when the dissolving temperature reaches 760°C, gradually adding the prepared aluminum-nickel master alloy and aluminum-manganese master alloy according to the composition; S4, after the alloy components are fully melted, heating is stopped to carry out refining and degassing, and then the temperature is cooled down to 740℃ for ingot casting.

2. The high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process according to claim 1, characterized in that: The harmful substance content in the die-cast aluminum alloy is controlled to be: Pb content is less than or equal to 0.1%; Hg content is less than or equal to 0.1%; The Cd content is less than or equal to 0.01%.

3. The high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process according to claim 1, characterized in that: In the step S1, the smelting furnace is preheated to an appropriate temperature, and then aluminum is placed in the smelting furnace for heating and dissolution. After the aluminum is completely melted, the calculated nickel is slowly added. After the nickel is completely melted, the melt is fully stirred with a stirring rod so that the aluminum and nickel are evenly mixed to form an aluminum-nickel intermediate alloy, wherein the aluminum content is 85% and the nickel content is 15%.

4. The high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process according to claim 3, characterized in that: In step S2, the smelting furnace is preheated to an appropriate temperature, and then aluminum is placed in the smelting furnace for heating and dissolution. After the aluminum is completely melted, the calculated manganese is slowly added. After the manganese is completely melted, the melt is fully stirred with a stirring rod so that the aluminum and manganese are evenly mixed to form an aluminum-manganese intermediate alloy, wherein the aluminum content is 85% and the manganese content is 15%.

5. The high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process according to claim 4, characterized in that: In step S3, the smelting furnace is preheated to an appropriate temperature, and then the A00 aluminum ingot is placed in the smelting furnace for heating and dissolution. After the A00 aluminum ingot is completely melted and the solution temperature reaches 760°C, the configured aluminum-nickel master alloy and aluminum-manganese master alloy are gradually added, and the melt is fully stirred with a stirring rod to make the alloy solution evenly mixed and melted.

6. The high temperature and corrosion resistant aluminum alloy that can be used in high pressure die casting process according to claim 5, characterized in that: In the step S4, the heating is stopped after the alloy solution components are fully melted, and the molten alloy is refined and degassed. Then, the molten alloy is cooled and the aluminum-nickel-manganese alloy is cast when the temperature drops to 740°C.

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