Novel Al-Mg-Si alloy material high in strength and resistant to seawater corrosion and preparation method thereof

An alloy material and corrosion-resistant technology, which is applied in the field of high-strength, seawater corrosion-resistant new Al-Mg-Si alloy material and its preparation, can solve the problems of low strength and poor corrosion resistance of aluminum alloys, and achieve strength improvement and good Effects of castability and processability, high mechanical properties and seawater corrosion resistance

Inactive Publication Date: 2017-03-08
CENT SOUTH UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of Al-Mg-Si alloy material and preparation method thereof that not only has excellent seawater corrosion resistance but also has high-strength characteristics aiming at the characteristics of poor corrosion resistance and low strength of aluminum alloys used in ships at present, so that Meet the use of ships in complex sea environments

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  • Novel Al-Mg-Si alloy material high in strength and resistant to seawater corrosion and preparation method thereof
  • Novel Al-Mg-Si alloy material high in strength and resistant to seawater corrosion and preparation method thereof
  • Novel Al-Mg-Si alloy material high in strength and resistant to seawater corrosion and preparation method thereof

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Embodiment 1

[0043] Example 1 The ingredients are prepared according to the mass percentage of the following elements: Mg: 3.15%; Si: 2.91%; Mn: 0.6%; Cr: 0.25%; Zr: 0.25%; Ti: 0.2%; Ag: 0.4%; Fe≤0.01% . Prepare 2mm thick plates. Specific preparation process: Before melting and casting, the aluminum ingot, master alloy and crucible are preheated at a certain temperature for a certain period of time to remove moisture and impurities. During the melting and casting process, the relative humidity at room temperature should be strictly controlled below 40%. When the aluminum block melts about 50%, a special covering agent is added, and then Al-Mn master alloy, Al-Si master alloy, and Al-Zr master alloy are added in order. alloy, Al-Cr intermediate alloy, when the melt temperature rises to 740°C, add Mg block covered with aluminum foil. During the melting process of the intermediate alloy, it is necessary to ensure that there is a covering agent covering the liquid surface to prevent oxidation...

Embodiment 2

[0044] Example 2 is compounded according to the mass percentage of the following elements: Mg: 2.6%; Si: 1.78%; Mn: 0.48%; Cr: 0.28%; Zr: 0.25%; Ti: 0.2%; Ag: 0.3%; Fe≤0.01% . Prepare 2mm thick plates. Specific preparation process: Before melting and casting, the aluminum ingot, master alloy and crucible are preheated at a certain temperature for a certain period of time to remove moisture and impurities. During the melting and casting process, the relative humidity at room temperature should be strictly controlled below 40%. When the aluminum block melts to about 50%, add a special covering agent, and then add Al-Mn master alloy, Al-Si master alloy, and Al-Zr master alloy in order. , Al-Cr master alloy, when the melt temperature rises to 740 ℃, add the Mg block covered with aluminum foil. During the melting process of the master alloy, it is necessary to ensure that there is a covering agent covering the liquid surface to prevent oxidation and block the gas from entering. m...

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Abstract

The invention discloses a novel Al-Mg-Si alloy material high in strength and resistant to seawater corrosion and a preparation method thereof. By adoption of the alloy material, mutual contradiction between the corrosion resistance and the strength in the ship material designing process is effectively overcome. The alloy material comprises, by mass, 1.8-3.6 wt% of Mg, 1.6-3.3 wt% of Si, 0.45-0.65 wt% of Mn, 0.25-0.35 wt% of Cr, 0.15-0.3 wt% of Zr, 0.2-0.3 wt% of Ti, 0.2-0.5 wt% of Ag, no more than 0.03 wt% of each impurity, no more than 0.1 wt% of all impurities, and the balance Al. According to the novel Al-Mg-Si alloy material high in strength and resistant to seawater corrosion and the preparation method thereof, the multi-component composite micro-alloyed element design is adopted, and the smelting and casting technique, the rolling control method and the solution and aging heat treatment technique are optimized, so that the Al-Mg-Si alloy material which is accurate in component, reasonable in structure regulation and control, and excellent in comprehensive performance is prepared. The tensile strength of the obtained material is not smaller than 375 MPa, the ductility is not smaller than 12.0%, the intercrystalline corrosion resistance is the first level (according to GB/T 7998-2005), the maximum corrosion depth is 0.03 [mu]m, and the exfoliation corrosion resistance is the N level (according to GB/T 22639-2008).

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and relates to a novel Al-Mg-Si alloy material with high strength and seawater corrosion resistance and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloys have been widely used as structural and functional parts in ships and marine equipment because of their low density, good mechanical properties, processing properties, thermal conductivity, electrical conductivity and corrosion resistance. It plays an important role in improving quality, improving navigation speed and seawater corrosion resistance, and reducing energy consumption. [0003] Materials for ships are required to have high mechanical properties such as high tensile strength, elongation and impact resistance, as well as high corrosion resistance. Nowadays, corrosion-resistant and weldable aluminum alloys with medium strength are mostly used, such as: 5xxx and 6xxx alloys. According to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/08C22C1/03C22F1/043C22F1/047C22F1/05
CPCC22C1/026C22C1/03C22C21/02C22C21/08C22F1/043C22F1/047C22F1/05
Inventor 罗兵辉郑亚亚柏振海高阳王姣
Owner CENT SOUTH UNIV
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