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Germanium-contained (Ge-contained) corrosion-resistant aluminum-based solder

A corrosion-resistant aluminum alloy and brazing material technology, which is applied in the field of aluminum alloy welding, can solve problems such as accelerating the corrosion of aluminum substrates, reducing the strength of joints, and reducing the melting point of brazing filler metals, so as to reduce the cost of brazing filler metals, facilitate operation, and process consumption. Effect

Inactive Publication Date: 2013-04-03
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of Cu added will make the solder brittle, and a large amount of Al-Cu intermetallic compound θ phase will accelerate the corrosion of the aluminum matrix; the addition of Ge will also greatly reduce the melting point of the solder, which is mainly related to the Al-Ge alloy (Al -51.6Ge) is related to the eutectic temperature of 424°C, but Ge is expensive, and Ge is a brittle phase, and excessive addition will reduce the joint strength

Method used

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Effect test

preparation example Construction

[0019] The preparation method of the above-mentioned Ge-containing corrosion-resistant aluminum alloy solder comprises the steps of:

[0020] 1. Al, Si, Cu, Ge, Sn, Ce with a purity greater than 99.6% are used as raw materials, and the proportions according to mass percentage are Si: 6.5, Cu: 15.0, Ge: 0.1~8.0, Sn: 6.0, Ce: 1.0 , the balance is Al, put it into a vacuum induction melting furnace, and draw a vacuum to 4.0×10 -3 Pa, filled with 0.05MPa of pure argon for induction melting, repeated smelting for 3 to 5 times and then poured into the iron mold in the furnace to obtain a master alloy ingot with uniform composition;

[0021] 2. Breaking the master alloy ingot obtained in step 1 into small pieces, removing scale, and ultrasonic cleaning in acetone;

[0022] 3. Put the small piece of master alloy obtained in step 2 into the quartz tube with a round hole at the lower end of the vacuum spin quenching system, start the vacuum spin quenching system, and extract the vacuum ...

Embodiment 1

[0030] Al, Si, Cu, Ge, Sn, Ce with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is Si: 6.5, Cu: 15.0, Ge: 8.0, Sn: 6.0, Ce: 1.0, and the balance is Al is taken, put into a vacuum induction melting furnace, and the vacuum is drawn to 4.0×10 -3 Pa, filled with 0.05MPa pure argon for induction melting, fully alloyed and poured into the iron mold in the furnace to obtain rod-shaped master alloy ingots. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Ge, Sn, and rare earth element Ce during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces, then put into the quartz tube in the vacuum spin quenching system, the vacuum spin quenching system is started, and the vacuum of the induction furnace chamber is drawn to 4.0×10 -3 Pa filled with 0.05MPa of pure argon for protection, using high-...

Embodiment 2

[0032] Al, Si, Cu, Ge, Sn, Ce with a purity greater than 99.6% are used as raw materials, and the ratio by mass percentage is Si: 6.5; Cu: 15.0; Ge: 5.5; Sn: 6.0; Ce: 1.0, and the balance is Al is taken, put into a vacuum induction melting furnace, and the vacuum is drawn to 4.0×10 -3 Pa, filled with 0.05MPa pure argon for induction melting, fully alloyed and poured into the iron mold in the furnace to obtain rod-shaped master alloy ingots. In order to ensure that the composition of the ingot meets the design composition, attention must be paid to the loss of Ge, Sn, and rare earth element Ce during the smelting process. After the master alloy ingot is prepared, it is taken out from the induction furnace and broken into small pieces, then put into the quartz tube in the vacuum spin quenching system, the vacuum spin quenching system is started, and the vacuum of the induction furnace chamber is drawn to 4.0×10 -3 Pa filled with 0.05MPa of pure argon protection, using high-freq...

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Abstract

The invention discloses germanium-contained (Ge-contained) corrosion-resistant aluminum-based solder. The solder comprises the following components in mass percent: 6.5 percent of silicon (Si), 15.0 percent of copper (Cu), 0.1-8.0 percent of Ge, 6.0 percent of stannum (Sn), 1.0 percent of cerium (Ce) and the balance aluminum (Al). The solder is prepared by adopting the rapid cooling technique. The melting point of the solder is lower than 520 DEG C, and the brazing temperature is 540-550 DEG C. The Ge-contained corrosion-resistant aluminum-based solder is suitable for brazing of aluminum alloy of which the solidus is higher than 550 DEG C, such as flame brazing, induction brazing, furnace brazing and gas shield brazing. The solder is matched with a QJ201 brazing aluminum plate 3003, so that the shear strength of a brazed joint is higher than 82MPa. When the percentage composition of the Ge is 2.5, the corrosion resistance of solder alloy is optimal, and the corrosion current density is 3.562muAcm<-2>.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy welding, in particular to a Ge-containing corrosion-resistant aluminum alloy solder and a preparation method thereof. Background technique [0002] Aluminum alloy has the advantages of high specific strength and corrosion resistance, and has been widely used in industries such as automobiles, ships, petrochemicals, and aerospace. Aluminum alloy welding mainly refers to the welding of deformed aluminum alloys. Deformed aluminum alloys are divided into non-heat-treatable aluminum alloys (that is, anti-rust aluminum) and heat-treatable aluminum alloys. Among them, non-heat-treatable aluminum alloys are the main aluminum alloys used for welding structures. . [0003] Compared with heat-treatable and strengthened aluminum alloys (such as duralumin and wrought aluminum), anti-rust aluminum has good weldability, and a series of difficulties will be encountered in the welding process, such as weld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K35/40
Inventor 罗伟黄鹏严密王丽腾宫海龙马天宇吴朝育
Owner ZHEJIANG UNIV
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