Al-Mg-Si-Cu-Mn-Sr alloy with excellent corrosion resistance and preparation method thereof

An al-mg-si-cu-mn-sr, corrosion-resistant technology, applied in the field of Al-Mg-Si-Cu-Mn-Sr alloy and its preparation, can solve few problems and achieve low production cost , The grain size distribution is uniform, and the effect of eliminating internal pores and shrinkage

Inactive Publication Date: 2018-11-30
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on microalloying Sr in Al-Mg-Si

Method used

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  • Al-Mg-Si-Cu-Mn-Sr alloy with excellent corrosion resistance and preparation method thereof
  • Al-Mg-Si-Cu-Mn-Sr alloy with excellent corrosion resistance and preparation method thereof
  • Al-Mg-Si-Cu-Mn-Sr alloy with excellent corrosion resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the Al-Mg-Si-Cu-Mn-0.03Sr alloy material was prepared according to the following steps:

[0035] Step 1: Prepare alloy ingot

[0036] 1a. Ingredients: According to the mass percentage of 95.82% Al, 1.0% Mg, 1.3% Si, 0.9% Cu, 0.6% Mn, 0.1% Ti, 0.25% Cr and 0.03% Sr, weigh the metal Al, Al-10% Mg Master alloy, Al-20%Si master alloy, Al-50%Cu master alloy, Al-20%Mn master alloy, Al-10%Cr master alloy, Al-5%Ti and Al-10%Sr master alloy for batching , The total mass of ingredients is 1200g;

[0037] 1b. Melting: first set the furnace temperature to 300°C, add metal Al to the crucible after the crucible is dry, raise the furnace temperature to 800°C, keep the temperature until the Al melts, then lower the temperature to 780°C, stir and keep for 10 minutes;

[0038] 1c. Add Al-Si master alloy, Al-Cu master alloy, Al-Mn master alloy, Al-Ti master alloy and Al-Cr master alloy. After melting, stir slightly and keep holding for 10 minutes to obtain a melt;

[0039] 1d....

Embodiment 2

[0057] In this example, the Al-Mg-Si-Cu-Mn-0.06Sr alloy material was prepared according to the same steps as in Example 1. The difference is: in step 1a, according to 95.79% Al, 1.0% Mg, 1.3% Si, 0.9% Cu, The mass percentage of 0.6% Mn, 0.1% Ti, 0.25% Cr and 0.06% Sr, weigh the metal Al, Al-10% Mg master alloy, Al-20% Si master alloy, Al-50% Cu master alloy, Al- 20%Mn master alloy, Al-10%Cr master alloy, Al-5%Ti and Al-10%Sr master alloy are batched, and the total weight of batching is 1200g;

[0058] The Al-Mg-Si-Cu-Mn-0.06Sr alloy material was subjected to a room temperature tensile test according to the same method as in Example 1, and the mechanical performance index obtained: tensile strength σ b 399Mpa, yield strength σ 0.2 It is 349.9Mpa and the elongation δ is 17.7%. See Table 1 for details.

[0059] The corrosion performance test of Al-Mg-Si-Cu-Mn-0.06Sr alloy material was carried out according to the same method in Example 1. The exfoliation corrosion grade of the obtaine...

Embodiment 3

[0061] In this example, the Al-Mg-Si-Cu-Mn-0.09Sr alloy material was prepared according to the same steps as in Example 1. The difference is: in step 1a, according to 95.76% Al, 1.0% Mg, 1.3% Si, 0.9% Cu, The mass percentage of 0.6% Mn, 0.1% Ti, 0.25% Cr and 0.09% Sr, weigh the metal Al, Al-10% Mg master alloy, Al-20% Si master alloy, Al-50% Cu master alloy, Al- 20%Mn master alloy, Al-10%Cr master alloy, Al-5%Ti and Al-10%Sr master alloy are batched, and the total weight of batching is 1200g;

[0062] The Al-Mg-Si-Cu-Mn-0.09Sr alloy material was subjected to a room temperature tensile test according to the same method as in Example 1, and the obtained mechanical property index: tensile strength σ b 399Mpa, yield strength σ 0.2 It is 345.6Mpa and the elongation δ is 17.5%. See Table 1 for details.

[0063] The corrosion performance test of Al-Mg-Si-Cu-Mn-0.09Sr alloy material was carried out in the same way as in Example 1. The exfoliation corrosion grade of the obtained alloy mater...

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Abstract

The invention discloses an Al-Mg-Si-Cu-Mn-Sr alloy with excellent corrosion resistance. The alloy contains alkaline-earth metal Sr with the mass percentage of 0.06-0.09%. The element Sr is added in the Al-Mg-Si-Cu-Mn-Sr alloy; the contents of the other alloy elements are reasonably designed; a reasonable smelting process and a quick solidification technology are adopted; and repeated rolling and proper heat treatment are performed to prepare an Al-Mg-Si-Cu-Mn-Sr alloy material with uniform microscopic structures and fine grains; the obtained alloy material is better in mechanical performance and corrosion resistance; the tensile omega b is not less than 395 Mpa; the ductility delta is not less than 17%; the exfoliation corrosion resisting grade is PC grade; the maximum intergranular corrosion depth is not more than 180 microns; and the alloy is simple in process, low in cost and excellent in comprehensive performance.

Description

Technical field [0001] The invention belongs to the technical field of non-ferrous metals, and specifically relates to an Al-Mg-Si-Cu-Mn-Sr alloy and a preparation method thereof. Background technique [0002] Aluminum is the most abundant metal on earth, and aluminum and aluminum alloys are widely used. Compared with other metal materials, aluminum alloy has a series of excellent characteristics. Among them, 6000 series aluminum alloys are deformable aluminum alloys that can be strengthened by heat treatment, with medium strength, good weldability and corrosion resistance, etc., and are widely used, especially in the fields of aerospace, transportation, and construction. Pure aluminum is relatively corrosion resistant, but its strength is very low. The aluminum alloy alloyed with elements such as Mg, Si, Cu, etc., although its strength has been improved, it damages the plasticity and corrosion resistance of the alloy. It is prone to corrosion in the natural hot and humid envir...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C21/02C22C1/03C22C1/06C22F1/05
CPCC22C1/026C22C1/03C22C1/06C22C21/00C22C21/02C22F1/002C22F1/043C22F1/05
Inventor 陈文琳李灿雷远
Owner HEFEI UNIV OF TECH
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